WO2018028219A1

WO2018028219A1 - Method and device for device arbitration

Info

Publication number: WO2018028219A1
Application number: PCT/CN2017/079344
Authority: WO
Inventors: 陈怡佳; 刘辉; 彭仕衡
Original assignee: 华为技术有限公司
Priority date: 2016-08-08
Filing date: 2017-04-01
Publication date: 2018-02-15
Also published as: CN106301900A; CN106301900B

Abstract

Disclosed are a method and device for device arbitration. The method comprises: a first storage device transmits an arbitration request message to an arbitration server; the arbitration server transmits, on the basis of the arbitration request message, of registration information of the first storage device, and of a second storage device not taking over a host service, to the first storage device an indication message indicating that the first storage device is to take over the host service and deletes registration information of the second storage device; the first storage device transmits a reservation request message to the arbitration server to indicate that the arbitration server is to ban the second storage device from registering. The method and device for device arbitration provided in embodiments of the present invention can prevent the occurrence of a possible case of data desynchronization as a result of multiple device simultaneously taking over the host service, thus increasing the fault tolerance capability, reliability, and security of a dual live arbitration system.

Description

Method and equipment for equipment arbitration

Technical field

The present invention relates to the field of communications, and in particular, to a method and device for device arbitration.

Background technique

With the development of information technology, the processing of data is more and more concentrated, and the requirements for data security are getting higher and higher. The dual-active system is a resource-saving computer disaster recovery (Disaster Recovery) solution, and its implementation mode is to let two The data centers simultaneously assume the user's business, and the two data centers are backed up each other and backed up in real time.

When the communication between the two data centers of the active-active system is disconnected, the two data centers respectively send an arbitration request message to the arbitration server to request to take over the host service, and the arbitration server saves the registration information of the two data centers when the arbitration The server determines that one of the data centers can take over the host service and deletes the registration information of the other data center. This prevents the two data centers from taking over the host service at the same time and causing the host service to be inconsistent. However, according to the prior art solution, if the data center whose registration information is deleted initiates the registration request and the arbitration request again, the arbitration server saves the registration information of the data center, and determines the data according to the registration information of the data center saved therein. The center can take over the host service. In this way, two data centers will take over the host service at the same time, which may result in inconsistent host services provided by the external.

Summary of the invention

In view of this, the embodiments of the present invention provide a method and a device for arbitrating devices, which can prevent the device that fails the arbitration from registering and preempting operations again, thereby improving fault tolerance, reliability, and security of the system.

In one aspect, an embodiment of the present invention provides a method for device arbitration, where the method is applied to a storage system, where the storage system includes a first storage device, a second storage device, and an arbitration server, and the method includes: when the first When the communication link between the storage device and the second storage device fails, the first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the identification information of the first storage device and the service. Taking over the information, the service takeover information is used to indicate that the first storage device requests to take over the host service; the arbitration server is configured according to the arbitration request message of the first storage device, the registration information of the first storage device, and the The second storage device does not take over the host service, and sends an indication message indicating that the first storage device takes over the host service to the first storage device, and deletes the registration information of the second storage device saved by the arbitration server, where The arbitration server pre-stores registration information of the first storage device and the second storage The registration information of the device, the first storage device takes over the host service according to the indication message, and sends a reservation request message to the arbitration server, where the reservation request message includes the identification information of the first storage device and the pre- The indication information is used to indicate that the arbitration server prohibits the second storage device from registering; the arbitration server receives a registration request message from the second storage device, where the registration request message includes Determining registration information of the second storage device; the arbitration server denying the second storage device to register according to the reservation indication information.

According to the method for device arbitration provided by the embodiment of the present invention, the arbitration server may use the first storage device according to the arbitration request message of the first storage device, the registration information of the first storage device, and the current situation that the second storage device does not take over the host service. The device is determined to be the only device that takes over the host service, thereby ensuring that the first array is the only device that takes over the host service, and avoids the situation that multiple arrays may take over the data caused by the host service at the same time, and the data is not synchronized. Improve the system's fault tolerance, reliability and security.

Optionally, after the arbitration server receives the reservation request message from the first storage device, the method further includes: a communication link between the first storage device and the second storage device After the normal recovery, the first storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used to request the arbitration server to delete the reservation indication information, so as to facilitate the second storage device. Performing registration; the arbitration server deletes the reservation indication information according to the reservation clear message.

According to the method for device arbitration provided by the embodiment of the present invention, the arbitration server may delete the reservation indication information of the first storage device according to the reservation clear message sent by the first storage device, so that the second storage device performs registration, and thus may be different. After the communication between the storage devices is restored, use multiple storage devices to process the host services to improve system reliability and security.

Optionally, after the arbitration server receives the reservation request message from the first storage device, the method further includes: the second storage device sending a reservation clear message to the arbitration server, where the The reservation clear message is used to request the arbitration server to delete the reservation indication information; the arbitration server rejects the request to clear the reservation clear message according to the reservation indication information, where the reservation indication information is used for Instructing the arbitration server to reject the deletion request of the second storage device.

According to the method for device arbitration provided by the embodiment of the present invention, the arbitration server may reject the request for the reservation clear message sent by the second storage device according to the reservation indication information of the first storage device, thereby preventing the device that fails the arbitration from registering again. Preemptive operations can improve the system's fault tolerance, reliability, and security.

On the other hand, an embodiment of the present invention provides a method for device arbitration, where the method is applied to a storage system, where the storage system includes a first storage device, a second storage device, and an arbitration server, and the method includes: When the communication link between the storage device and the second storage device fails, the first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the identifier information of the first storage device, The service takeover information and the reservation indication information, where the service takeover information is used to indicate that the first storage device requests to take over the host service, and the reservation indication information is used to indicate that the arbitration server prohibits the second storage device Performing registration; the arbitration server sends an indication to the first storage device according to the arbitration request message of the first storage device, the registration information of the first storage device, and the second storage device not taking over the host service. Determining, by the first storage device, an indication message of taking over the host service, and deleting the second saved by the arbitration server Registration information of the storage device, wherein the arbitration server pre-stores registration information of the first storage device and registration information of the second storage device; the arbitration server receives a registration request message from the second storage device The registration request message includes registration information of the second storage device; the arbitration server rejects the second storage device to register according to the reservation indication information.

According to the method for device arbitration provided by the embodiment of the present invention, the arbitration server may use the arbitration request message carrying the reservation indication information sent by the first storage device, the registration information of the first storage device, and the current second storage device does not take over the host service. In this case, the registration information of the second storage device is deleted, so that the first storage device is the only device that takes over the host service, and the situation that multiple storage devices may take over the data caused by the host service at the same time is avoided, thereby improving the system. Fault tolerance, reliability and security, while also saving on signaling overhead.

Optionally, after the arbitration server receives the arbitration request message from the first storage device, the method further includes: when the communication link between the first storage device and the second storage device is restored After the normal storage, the first storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used to request the arbitration server to delete the reservation indication information, so as to be performed by the second storage device. Registration; the arbitration server And deleting the reservation indication information according to the reservation clear message.

Optionally, after the arbitration server receives the arbitration request message from the first storage device, the method further includes: the arbitration server receiving a reservation clear message from the second storage device, where the reservation The clearing message is used to request the arbitration server to delete the reservation indication information; the arbitration server rejects the request for the reservation clear message according to the reservation indication information, where the reservation indication information is used to indicate The arbitration server rejects the deletion request of the second storage device.

In another aspect, an embodiment of the present invention provides an arbitration server for device arbitration, where the arbitration server can implement the functions performed by the arbitration server in the method related to the foregoing aspects, and the functions can be implemented by hardware or by hardware. Software implementation. The hardware or software includes one or more corresponding units or modules of the above functions.

In one possible design, the structure of the arbitration server includes a processor and a communication interface configured to support the arbitration server to perform the corresponding functions of the above methods. The communication interface is used to support communication between the arbitration server and other network elements. The arbitration server can also include a memory for coupling with the processor that holds the program instructions and data necessary for the arbitration server.

In a further aspect, the embodiment of the present invention provides a first storage device that is arbitrated by a device, and the first storage device may implement a function performed by the first storage device in the method related to the foregoing aspect, where the function may be implemented by using a hardware. The corresponding software implementation can also be performed by hardware. The hardware or software includes one or more corresponding units or modules of the above functions.

In one possible design, the first storage device includes a processor and a communication interface configured to support the arbitration server to perform the corresponding functions in the above method. The communication interface is used to support communication between the first storage device and other network elements. The first storage device can also include a memory for coupling with the processor that retains the program instructions and data necessary for the first storage device.

In still another aspect, an embodiment of the present invention provides a communication system, including the arbitration server and the first storage device in the foregoing aspect.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the arbitration server, which includes a program designed to execute the above aspects.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the first storage device, including a program designed to perform the above aspects.

Compared with the prior art, according to the method for device arbitration provided by the embodiment of the present invention, the arbitration server may use the request message sent by the first storage device, the registration information of the first storage device, and the current situation that no other storage device takes over the host service. Determining that the first storage device is the only device that takes over the host service, and the arbitration server rejects the registration request or the arbitration request of the other storage device according to the state that the first storage device uniquely takes over the host service, thereby ensuring that the first storage device is the only takeover Host service equipment, avoiding multiple devices that may appear at the same time The data that is taken over by the host service is not synchronized, which improves the fault tolerance, reliability, and security of the active-active arbitration system. In addition, the state of the first storage device that only takes over the host service can only be cleared by the message sent by the first storage device. The safety of the active-active arbitration system is further improved.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic architectural diagram of a possible storage system to which an embodiment of the present invention is applied;

2 is a schematic diagram of communication of a method for device arbitration according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of communication of another method for device arbitration according to an embodiment of the present invention; FIG.

4 is a schematic diagram of communication of a method for device arbitration according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of communication of another method for device arbitration according to an embodiment of the present invention; FIG.

6A is a schematic structural diagram of a possible arbitration server according to an embodiment of the present invention;

6B is a schematic structural diagram of another possible arbitration server according to an embodiment of the present invention;

7A is a schematic structural diagram of a possible storage device according to an embodiment of the present invention;

FIG. 7B is a schematic structural diagram of another possible storage device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The method and device for device arbitration according to an embodiment of the present invention may arbitrate a logical unit number (LUN) on an array or array of active-active systems, or may arbitrate other devices or units that need to arbitrate. The embodiment of the present invention is described in detail by taking an array as an example. The embodiment of the present invention is not limited thereto, and the method for device arbitration according to the embodiment of the present invention may also be applied to other storage devices.

In order to facilitate the understanding of the embodiments of the present invention, the application scenarios of the embodiments of the present invention are briefly introduced. Figure 1 shows a schematic diagram of one possible storage system to which embodiments of the present invention are applicable.

As shown in FIG. 1, the storage system includes: a host or a host cluster 110, an array 120, an array 130, and an arbiter server 140. The host cluster 110 is simultaneously connected to the array 120 and the array 130, and the array 120 and the array 130 are connected to each other. The array 130 is simultaneously connected to the arbitration server 140. When the active-active system is running normally, the host cluster 110 can simultaneously send and write services to the array 120 and the array 130. The process of sending the write service to the array 120 is as follows:

1. The host cluster 110 sends a write data service to the array 120.

2. The array 120 writes the sent data to the array 120 and the array 130 at the same time;

3. The write data of array 120 and array 130 are completed;

4. The array 120 sends a message to the host cluster 110 to write data completion.

The basic flow of write data for array 130 by host cluster 110 is similar, as shown in

steps

1', 2', 3', and 4'. When the communication link between the array 120 and the array 130 fails (ie, brain splitting), in order to avoid business out of synchronization, The host service can only be taken over by one of the array 120 and the array 130. Since the array 120 and the array 130 cannot communicate with each other at this time, it is necessary for the arbitration server 140 to determine who will take over the host service. The array 120 and the array 130 respectively initiate an arbitration request to the arbitration server 140. If the arbitration server 140 first receives the arbitration request message sent by the array 120, the arbitration server may determine the array 120 according to the registration information of the array 120 and the arbitration request message of the array 120. To win, array 120 is determined to take over the array of host services and clear the registration information for array 130.

Since the arbitration server 140 can only passively accept the registration information of the array 120 and the array 130, when the array 130 has a logic error, the array 130 may register again and then initiate arbitration, and the array 130 will also win, resulting in an array. The 120 and the array 130 simultaneously provide services to the outside, and data inconsistency may occur.

According to the method for device arbitration according to the embodiment of the present invention, the array 120 sends a reservation request message to the arbitration server after the arbitration wins, the reservation request message includes an identifier of the array 120 and reservation indication information, and the reservation request message is used for the request. The arbitration server 140 prohibits the array 130 from registering, thereby avoiding the array 130 arbitrating winning. Or the array 120 may also want the arbitration server 140 to send an arbitration request message including reservation indication information, requesting to take over the host service and requesting the arbitration server 140 to prohibit the array 130 from registering.

FIG. 2 is a schematic flowchart of a method for device arbitration provided by an embodiment of the present invention. As shown in FIG. 2, the method 200 includes:

S201: The first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the identifier information of the first storage device and the service takeover information, where the service takeover information is used to indicate that the first storage device requests to take over the host service.

S202, the arbitration server deletes the registration information of the second storage device saved by the arbitration server according to the arbitration request message sent by the first storage device, the registration information of the first storage device, and the second storage device does not take over the host service, where the arbitration server is pre- The registration information of the first storage device and the registration information of the second storage device are saved.

S203. The arbitration server sends an indication message to the first storage device that the first storage device takes over the host service.

S204: The first storage device takes over the host service according to the indication message, and sends a reservation request message to the arbitration server, where the reservation request message includes identifier information of the first storage device and reservation indication information, where the reservation indication information is used. The arbitration server is instructed to prohibit the second storage device from registering.

S205. The arbitration server receives a registration request message from the second storage device, where the registration request message includes registration information of the second storage device.

S206. The arbitration server rejects the second storage device to register according to the reservation indication information.

The first storage device may be a first array, and the first array may generate arbitration request information when it is found that the communication link with the second array (ie, the second storage device) is disconnected, the arbitration request information is used to request to take over the host The arbitrating server may determine, according to the registration information of the first array stored locally, and the current situation that no other array takes over the host service, determine the first array as an array that takes over the host service, and send an indication message to the first array to notify the first Array arbitration wins; the first array may generate reservation request information according to its arbitration victory, the reservation request message is used to instruct the arbitration server to prohibit the second array registration, for example, the reservation request message may request the arbitration server to be the first array The registration information is modified into reservation information, and the reservation information indicates that the first array is the only device that takes over the host service; after receiving the reservation request information, the arbitration server modifies the registration information of the first array to the reservation according to the reservation request information. Information, the arbitration server may reject the arbitration request of the second array according to the reservation information Or clear the registration request requesting the reservation information, the device can be ensured as the only first array take over the host service, may be avoided The data that can occur when multiple arrays take over the host business at the same time is not synchronized.

The foregoing embodiment is only an example, and the embodiment of the present invention is not limited thereto. For example, the arbitration server may add an identifier to the registration information of the first array according to the reservation request information sent by the first array, where the identifier is used to disable the second array. registered.

Optionally, after the arbitration server receives the reservation request message from the first storage device, the method 200 further includes:

S207. After the communication link between the first storage device and the second storage device returns to normal, the first storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used to request the arbitration server to delete the reservation indication message. In order to facilitate the registration of the second storage device.

S208. The arbitration server deletes the reservation indication information according to the reservation clear message.

After the communication link between the first storage device and the second storage device returns to normal, the first storage device may send a reservation clear message to the arbitration server, requesting to clear the reservation indication information, and the arbitration server clears the reservation indication information. The second storage device may send a registration request message to the arbiter server to request registration. At this time, the arbitration server may save the registration information of the second storage device. After the second storage device is successfully registered, the second storage device may be associated with the first storage device. Take over the host service and synchronize the data, and continue to perform the secure backup function of the active-active system.

Optionally, the method 200 further includes:

S209. The second storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used to request the arbitration server to delete the reservation indication information of the first storage device.

S210. The arbitration server rejects the request for the reservation clear message of the second storage device according to the reservation indication information, where the reservation indication information is used to indicate that the arbitration server rejects the deletion request of the second storage device.

The reservation indication information of the first storage device can be automatically cleared by the first storage device, and the other device cannot clear the state, so that the reservation indication information of the first array caused by virus intrusion, software bugs, and the like can be prevented from being deleted. safety.

Only two storage devices are illustrated by way of example in FIG. 2, and the method of device arbitration according to an embodiment of the present invention is also applicable to a storage system including more than two storage devices. Therefore, the method 200 for device arbitration according to an embodiment of the present invention is illustrated. After the arbitration wins, the storage device sends the reservation request information to the arbitration server, and requests the storage device to be the only device that takes over the host service, and avoids different storage caused by software bugs, user misoperations, network transmission failures, virus intrusion, and the like. The devices provide services to the outside, thus avoiding the inconsistency of external data and improving the fault tolerance, reliability and security of the dual-active arbitration system.

FIG. 3 is a schematic flowchart of a method for device arbitration provided by an embodiment of the present invention. As shown in FIG. 3, the method 300 includes:

S301. When the communication link between the first storage device and the second storage device fails, the first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the identifier information of the first storage device and the service takeover information. And the reservation indication information, wherein the service takeover information is used to indicate that the first storage device requests to take over the host service, and the reservation indication information is used to instruct the arbitration server to prohibit the second storage device from registering.

S302, the arbitration server deletes the registration information of the second storage device saved by the arbitration server according to the arbitration request message of the first storage device, the registration information of the first storage device, and the second storage device does not take over the host service, where the arbitration server is pre- The registration information of the first storage device and the second storage device is saved.

S303. The arbitration server sends an indication message to the first storage device, where the indication message is used to indicate that the first storage device can take over the host service.

S304. The arbitration server receives a registration request message from the second storage device, where the registration request message includes the second storage. Storage device registration information.

S305. The arbitration server rejects the second storage device to register according to the reservation indication information of the first storage device.

The first storage device may be a first array, and the first array may generate arbitration request information when it is found that the communication link with the second array (ie, the second storage device) is disconnected, the arbitration request information is used to request to take over the host The arbitration request message further includes reservation indication information, the reservation indication information instructing the arbitration server to prohibit the second array from registering; the arbitration server may take over the registration information of the first array stored locally, and currently no other array takes over the host service. The first array is determined to take over the array of host services, and sends an indication message to the first array to notify the first array that the arbitration wins, and the arbitration server may further reserve the first array in the arbitration server according to the reservation indication information. The registration information is modified into reservation information, and the arbitration server may reject the arbitration request, the registration request, or the request for clearing the reservation information according to the reservation information, thereby ensuring that the first array is the only device that takes over the host service. Avoid the number of possible multiple arrays taking over the host business at the same time Not synchronized, it can also save signaling overhead equipment arbitration method according to an embodiment of the present invention.

FIG. 4 is a schematic flowchart of a method for device arbitration provided by another embodiment of the present invention. As shown in FIG. 4, the method 400 includes:

At S401, array 410 finds that the communication link between array 410 and array 420 is broken (ie, brain split).

S402. The array 410 initiates an arbitration request to the arbitration device (for example, the arbitration server 430) to request to take over the host service.

S403, the arbitration server 430 determines whether the registration information A of the array 410 is stored locally;

The array 410 registers with the arbiter server 430 when it has its own ability to handle host services so that the arbitration server 430 can determine that the array 410 has the ability to take over host services after the brain split occurs, and when the array 410 finds itself losing the ability to process traffic, The information for clearing the registration information A is sent to the arbitration server 430.

S404, the arbitration server 430 determines that the array 410 arbitrates the win, and clears the registration information B of the array 420, wherein the arbitration server 430 processes the arbitration request sent by the array 410 only when it determines that the registration information A of the array 410 is stored locally, and determines The method for arbitrating the array arbitration may be a first-come-first-served principle, that is, the arbitration server determines the array indicated by the first arbitration request to be an array of arbitration wins, and the method for determining the arbitration victory may also be other methods. The embodiment does not limit this.

S405, the arbitration server 430 sends an arbitration victory message to the array 410, informing the array 410 to arbitrate the win.

S406, the array 410 sends the reservation request information to the arbitration server 430, requesting the arbitration server 430 to modify the registration information A to the reservation information A, and the reservation information A is used to indicate that the array 410 is exclusive to the takeover of the host service, in the array 410. During the process of taking over the host service, the arbitrating server 430 rejects the operations of the reservation, the registration, the arbitration, and the like of the other arrays, and the modification of the registration information A to the reservation information A is only an example. The embodiment of the present invention is not limited thereto, and optionally, the array The 410 may send the exclusive request information to the arbitration server 430, requesting the arbitration server 430 to add an identifier to the registration information A, the identifier being used to indicate that the array 410 is exclusive to the takeover of the host service.

S407, the arbitration server 430 modifies the registration information A into the reservation information A according to the reservation request information sent by the array 410, and the arbitration server 430 can clear the registration information B of the array 420 according to the reservation information A.

At S408, array 420 finds that the communication between array 420 and array 410 is broken (ie, brain splitting).

S409, the array 420 sends registration request information to the arbitration server 430.

S410. The arbitration server 430 prohibits the array 420 from registering according to the locally stored reservation information A.

S411, the arbitration server 430 sends a message rejecting registration to the array 420.

S412, the array 420 sends an arbitration request message to the arbitration server 430 requesting to take over the host service.

S413, the arbitration server 430 determines that the array 420 fails arbitration according to the local registration information B of the storage array 420.

S414, the arbitration server 430 sends an arbitration failure message to the array 420.

S415, the array 410 initiates a data synchronization task to the array 420 based on the communication link recovery between the array 410 and the array 420.

S416, the array 410 is synchronized according to the data of the array 410 and the array 420, and sends a clear message to the arbitration server 430, which is used to request the arbitration server 430 to clear the state of the unique takeover host service of the array 410.

S417. The arbitration server 430 modifies the reservation information A into the registration information A according to the clear message sent by the array 410.

S418, the array 420 sends a registration request message to the arbitration server 430 requesting to process the host service.

S419, the arbitration server 430 determines that the array 420 can process the host service according to the local storage reservation information, and saves the registration information B of the array 420.

S420, the arbitration server 430 sends a registration success message to the array 420, informing the array 420 that the host service can be processed.

According to the method 400 for device arbitration according to the embodiment of the present invention, the storage device sends the reservation request information to the arbitration server after the arbitration wins, requesting the storage device to be the only device that takes over the host service, avoiding software bugs, user misoperations, and networks. Different storage devices caused by transmission failures and virus intrusion take over the host services, thus avoiding the inconsistency of external data and improving the fault tolerance, reliability, and security of the dual-active arbitration system.

FIG. 5 is a schematic flowchart of a method for device arbitration provided by another embodiment of the present invention. As shown in FIG. 5, the method 500 includes:

At S501, array 510 finds that the communication link between array 510 and array 520 is broken (ie, brain split).

S502, the array 510 initiates an arbitration request to the arbitration device (for example, the arbitration server 530), requests to take over the host service, and requests the arbitration server 330 to modify the registration information A to the reservation information A, and the reservation information A is used to represent the array 310 to the host. The takeover of the service is exclusive. During the takeover of the host service by the array 310, the arbitrating server 330 rejects the operations of reservation, registration, and arbitration requests of other arrays, and the modification of the registration information A into the reserved information A is only an example, and the implementation of the present invention is implemented. The example is not limited to this;

S503, the arbitration server 530 determines whether the registration information A of the array 510 is stored locally;

S504, the arbitration server 530 determines that the array 510 arbitrates the win and clears the registration information B of the array 520. The arbitration server 530 processes the arbitration request sent by the array 510 only when determining that the registration information A of the array 510 is stored locally. The method for arbitrating the array arbitration may be a first-come-first-served principle, that is, the arbitration server determines the array indicated by the first arbitration request to be an array of arbitration wins, and the method for determining the arbitration victory may also be other methods. The embodiment does not limit this.

S505. The arbitration server 530 modifies the registration information A into the reservation information A according to the arbitration request message.

S506, the arbitration server 530 sends an arbitration victory message to the array 510, informing the array 510 to arbitrate the win.

At S507, array 520 finds that communication between array 520 and array 510 is broken (ie, brain splitting).

S508. The array 520 sends registration request information to the arbitration server 530.

S509. The arbitration server 530 prohibits the array 520 from registering according to the locally stored reservation information A.

S510, the arbitration server 530 sends a message rejecting registration to the array 520.

S511. The array 520 sends an arbitration request message to the arbitration server 530 requesting to take over the host service.

S512. The arbitration server 530 determines that the array 520 has failed arbitration according to the local registration information B of the storage array 520.

S513, the arbitration server 530 sends an arbitration failure message to the array 520.

S514, the array 510 initiates a data synchronization task to the array 520 according to the communication link recovery between the array 510 and the array 520.

S515, the array 510 is synchronized according to the data of the array 510 and the array 520, and sends a clear message to the arbitration server 530, which is used to request the arbitration server 530 to clear the state of the unique takeover host service of the array 510.

S516, the arbitration server 530 modifies the reservation information A into the registration information A according to the clear message sent by the array 510.

S517. The array 520 sends a registration request message to the arbitration server 530 requesting to process the host service.

S518. The arbitration server 530 determines that the array 520 can process the host service according to the local storage reservation information, and saves the registration information B of the array 520.

S519, the arbitration server 530 sends a registration success message to the array 520, informing the array 520 that the host service can be processed.

According to the method 500 for device arbitration according to the embodiment of the present invention, the storage device requests the storage device to be the only device that takes over the host service by sending the arbitration request information including the reservation request information to the arbitration server, thereby saving signaling overhead and avoiding Different storage devices caused by software bugs, user misoperations, network transmission failures, virus intrusion, etc. take over the host services, thus avoiding the inconsistency of external data and improving the fault tolerance, reliability and security of the active-active arbitration system. .

The foregoing embodiment mainly introduces the solution of the embodiment of the present invention from the perspective of interaction between the network elements. It can be understood that each network element, such as the arbitration server and the first storage device, includes hardware structures and/or software modules corresponding to the execution of the respective functions in order to implement the above functions. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiment of the present invention may divide the functional unit into the arbitration server and the first storage device according to the foregoing method example. For example, each functional unit may be divided according to each function, or two or more functions may be integrated into one processing unit. in. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.

In the case of employing an integrated unit, FIG. 6A shows a possible structural diagram of the arbitration server involved in the above embodiment. The arbitration server 600 includes a processing unit 602 and a communication unit 603. The processing unit 602 is configured to perform control management on the action of the arbitration server 600. For example, the processing unit 602 is configured to support the arbitration server 600 to execute S202 and S206 of FIG. 2, and the processing unit 602 may further be configured to support the arbitration server 600 to execute S302 of FIG. 3. And S305, and/or other processes for the techniques described herein. Communication unit 603 is used to support communication between arbitration server 600 and other network entities, such as communication with the first storage device shown in FIG. 2. The arbitration server 600 may further include a storage unit 601 for storing program codes and data of the arbitration server 600.

The processing unit 602 can be a processor or a controller, for example, can be a central processing unit (Central) Processing Unit, CPU), general purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), Field Programmable Gate Array (FPGA) or other Programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication unit 603 can be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and can include one or more interfaces. The storage unit 601 can be a memory.

When the processing unit 602 is a processor, the communication unit 603 is a communication interface, and the storage unit 601 is a memory, the arbitration server according to the embodiment of the present invention may be the arbitration server shown in FIG. 6B.

Referring to FIG. 6B, the arbitration server 610 includes a processor 612, a communication interface 613, and a memory 611. Optionally, the arbitration server 610 can also include a bus 614. The communication interface 613, the processor 612, and the memory 611 may be connected to each other through a bus 614. The bus 614 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 614 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 6B, but it does not mean that there is only one bus or one type of bus.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Therefore, the arbitration server provided by the embodiment of the present invention may perform the first storage according to the reservation request information sent by the first storage device after the arbitration wins, or according to the arbitration request message that includes the reservation indication information sent by the first storage device. The registration information of the device is modified to the reservation information, so that the second storage device can be re-registered successfully and the host service is taken over. In addition, the reservation information can only be deleted according to the reservation clear message sent by the first storage device, thereby improving the arbitration system. Security.

In the case of employing an integrated unit, FIG. 7A shows a possible structural diagram of the first storage device involved in the above embodiment. The first storage device 700 includes a processing unit 702 and a communication unit 703. The processing unit 702 is configured to perform control management on the action of the first storage device 700. For example, the processing unit 702 is configured to support the first storage device 700 to perform S201 and S204 of FIG. 2 through the communication unit 703, and the processing unit 702 may further be used to support The first storage device 700 performs S301 of Figure 3, and/or other processes for the techniques described herein. The communication unit 703 is for supporting communication between the first storage device 700 and other network entities, such as communication with the arbitration server shown in FIG. 2 or 3. The first storage device 700 may further include a storage unit 701 for storing program codes and data of the first storage device 700.

The processing unit 702 can be a processor or a controller, and can be, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication unit 703 can be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and can include one or more interfaces. The storage unit 701 can be stored Reservoir.

When the processing unit 702 is a processor, the communication unit 703 is a communication interface, and the storage unit 701 is a memory, the first storage device involved in the embodiment of the present invention may be the first storage device shown in FIG. 7B.

Referring to FIG. 7B, the first storage device 710 includes a processor 712, a communication interface 713, and a memory 711. Optionally, the first storage device 710 may further include a bus 714. The communication interface 713, the processor 712, and the memory 711 may be connected to each other through a bus 714. The bus 714 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 714 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 7B, but it does not mean that there is only one bus or one type of bus.

Therefore, the first storage device provided by the embodiment of the present invention sends a reservation request message to the arbitration server after the arbitration wins, and the reservation request message is used to request the arbitration server to reject the second storage device for registration, or directly to the arbitration server. Sending an arbitration request message including the reservation indication information, requesting to take over the host service and requesting to reject the second storage device for registration, thereby preventing the second storage device from re-registering successfully and taking over the host service, and further, the reservation information can only be based on the The deletion of the reservation clear message sent by a storage device improves the security of the arbitration system.

In the embodiment of the present invention, the sequence number of each process does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be limited to the implementation process of the embodiment of the present invention.

In addition, the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist at the same time. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

The steps of the method or algorithm described in connection with the disclosure of the embodiments of the present invention may be implemented in a hardware manner, or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in an arbitration server or a first storage device. Of course, the processor and the storage medium may also exist as discrete components in the arbitration server or the first storage device.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments described above further detail the object, technical solution and beneficial effects of the present invention. It is to be understood that the foregoing description is only illustrative of the embodiments of the present invention, and is not intended to limit the scope of the present invention. Equivalent substitutions, improvements, etc., are intended to be included within the scope of the invention.

Claims

A method for device arbitration, wherein the method is applied to a storage system, where the storage system includes a first storage device, a second storage device, and an arbitration server, and the method includes:

When the communication link between the first storage device and the second storage device fails, the first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the first The identification information of the storage device and the service takeover information, where the service takeover information is used to indicate that the first storage device requests to take over the host service;

The arbitration server sends an indication to the first storage device to the first storage device according to the arbitration request message of the first storage device, the registration information of the first storage device, and the second storage device not taking over the host service. The storage device takes over the indication message of the host service, and deletes the registration information of the second storage device saved by the arbitration server, where the arbitration server pre-stores the registration information of the first storage device and the second Registration information of the storage device;

The first storage device takes over the host service according to the indication message, and sends a reservation request message to the arbitration server, where the reservation request message includes the identifier information of the first storage device and the reservation indication information. The reservation indication information is used to indicate that the arbitration server prohibits the second storage device from registering;

The arbitration server receives a registration request message from the second storage device, where the registration request message includes registration information of the second storage device;

The arbitration server rejects the second storage device to register according to the reservation indication information.
The method according to claim 1, wherein after the arbitration server receives the reservation request message from the first storage device, the method further includes:

After the communication link between the first storage device and the second storage device returns to normal, the first storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used for requesting The arbitration server deletes the reservation indication information to facilitate registration by the second storage device;

The arbitration server deletes the reservation indication information according to the reservation clear message.
The method according to claim 1, wherein after the arbitration server receives the reservation request message from the first storage device, the method further includes:

The second storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used to request the arbitration server to delete the reservation indication information;

The arbitration server rejects the request to clear the reservation clear message according to the reservation indication information, where the reservation indication information is used to indicate that the arbitration server rejects the deletion request of the second storage device.
A method for device arbitration, wherein the method is applied to a storage system, where the storage system includes a first storage device, a second storage device, and an arbitration server, and the method includes:

When the communication link between the first storage device and the second storage device fails, the first storage device sends an arbitration request message to the arbitration server, where the arbitration request message includes the first The storage device identifier information, the service takeover information, and the reservation indication information, where the service takeover information is used to indicate that the first storage device requests to take over the host service, and the reservation indication information is used to indicate that the arbitration server prohibits The second storage device performs registration;

The arbitration server sends an indication to the first storage device to the first storage device according to the arbitration request message of the first storage device, the registration information of the first storage device, and the second storage device not taking over the host service. The storage device takes over the indication message of the host service, and deletes the note of the second storage device saved by the arbitration server The registration information, wherein the arbitration server pre-stores registration information of the first storage device and registration information of the second storage device;

The arbitration server receives a registration request message from the second storage device, where the registration request message includes registration information of the second storage device;

The arbitration server rejects the second storage device to register according to the reservation indication information.
The method according to claim 4, wherein after the arbitration server receives the arbitration request message from the first storage device, the method further includes:

After the communication link between the first storage device and the second storage device returns to normal, the first storage device sends a reservation clear message to the arbitration server, where the reservation clear message is used for requesting The arbitration server deletes the reservation indication information to facilitate registration by the second storage device;

The arbitration server deletes the reservation indication information according to the reservation clear message.
The method according to claim 4, wherein after the arbitration server receives the arbitration request message from the first storage device, the method further includes:

The arbitration server receives a reservation clear message from the second storage device, where the reservation clear message is used to request the arbitration server to delete the reservation indication information;

The arbitration server rejects the request for the reservation clear message according to the reservation indication information, where the reservation indication information is used to indicate that the arbitration server rejects the deletion request of the second storage device.
An arbitration server for device arbitration, wherein the arbitration server is applied to a storage system, the storage system includes a first storage device, a second storage device, and the arbitration server, and the arbitration server includes: a processing unit And communication unit,

The processing unit is configured to receive, by the communication unit, an arbitration request message from the first storage device, where the arbitration request message includes identifier information of the first storage device and service takeover information, where the service takeover information is used Instructing the first storage device to request to take over host service; and, according to the arbitration request message of the first storage device, registration information of the first storage device, and the second storage device not taking over host service, by using the communication The unit sends an indication message indicating that the first storage device takes over the host service to the first storage device, and deletes the registration information of the second storage device saved by the arbitration server, where the arbitration server is pre-stored Registration information of the first storage device and registration information of the second storage device; and receiving, by the communication unit, a reservation request message from the first storage device, the reservation request message including the first Identification information of the storage device and reservation indication information, where the reservation indication information is used to indicate the arbitration The server prohibits the second storage device from registering; and receives, by the communication unit, a registration request message from the second storage device, the registration request message including registration information of the second storage device; The indication information is reserved, and the second storage device is rejected for registration.
The arbitration server according to claim 7, wherein the processing unit is further configured to receive, by the communication unit, a reservation clear message from the first storage device, where the reservation clear message is used to request the The arbitration server deletes the reservation indication information; and clears the reservation indication information according to the reservation clear message, so that the second storage device performs registration.
The arbitration server according to claim 7, wherein the processing unit is further configured to receive, by the communication unit, a reservation clear message from the second storage device, where the reservation clear message is used to request the The arbitration server deletes the reservation indication information; and rejects the request to clear the reservation clear message according to the reservation indication information, where the reservation indication information is used to indicate that the arbitration server rejects the second storage Device deletion In addition to the request.
A storage device for device arbitration, wherein the storage device is applied to a storage system, the storage system includes the storage device, a second storage device, and an arbitration server, and the storage device includes: a processing unit and a communication unit,

When the communication link between the storage device and the second storage device fails, the processing unit is configured to send, by the communication unit, an arbitration request message to the arbitration server, where the arbitration request message includes the storage device Identification information and service takeover information, the service takeover information is used to indicate that the storage device requests to take over the host service; and receiving, by the communication unit, an indication message from the arbitration server, the indication message is used to indicate the storage device Receiving a host service; and taking over the host service according to the indication message; and transmitting, by the communication unit, a reservation request message to the arbitration server, the reservation request message being used to instruct the arbitration server to prohibit the second service The storage device is registered.
The storage device according to claim 10, wherein the processing unit is further configured to send a pre-send to the arbitration server after the communication link between the storage device and the second storage device returns to normal And leaving a clear message, the reservation clear message is used to request the arbitration server to delete the reservation indication information, so that the second storage device performs registration.
An arbitration server for device arbitration, wherein the arbitration server is applied to a storage system, the storage system includes a first storage device, a second storage device, and the arbitration server, and the arbitration server includes: a processing unit And communication unit,

The processing unit is configured to receive, by the communication unit, an arbitration request message from the first storage device, where the arbitration request message includes identifier information of the first storage device, and service takeover information and reservation indication information, where The service takeover information is used to indicate that the first storage device requests to take over the host service, and the reservation indication information is used to instruct the arbitration server to prohibit the second storage device from registering; and according to the first storage device The arbitration request message, the registration information of the first storage device, and the second storage device failing to take over the host service, and sending, by the communication unit, the first storage device to the first storage device to take over the host service. And indicating the message, and deleting the registration information of the second storage device saved by the arbitration server, where the arbitration server pre-stores the registration information of the first storage device and the registration information of the second storage device; And receiving, by the communication unit, a registration request message from the second storage device, the registration Registration request message comprising information the second storage device; and an information storage apparatus rejecting the second register in accordance with the reservation indication.
The arbitration server according to claim 12, wherein the processing unit is further configured to receive, by the communication unit, a reservation clear message from the first storage device, where the reservation clear message is used to request the The arbitration server deletes the reservation indication information; and deletes the reservation indication information according to the reservation clear message, so that the second storage device performs registration.
The arbitration server according to claim 12, wherein the processing unit is further configured to receive, by the communication unit, a reservation clear message from the second storage device, where the reservation clear message is used to request the The arbitration server deletes the reservation indication information; and rejects the request for the reservation request message according to the reservation indication information, where the reservation indication information is used to indicate that the arbitration server rejects the second storage device Delete request.
A storage device for device arbitration, wherein the storage device is applied to a storage system, the storage system includes the storage device, a second storage device, and an arbitration server, and the storage device includes: processing Unit and communication unit,

And when the communication link between the storage device and the second storage device fails, the processing unit is configured to send, by the communication unit, an arbitration request message to the arbitration server, where the arbitration request message includes the storage The identification information of the device, and the service takeover information and the reservation indication information, where the service takeover information is used to indicate that the storage device requires to take over the host service, and the reservation indication information is used to indicate that the arbitration server prohibits the first The second storage device registers; and receives, by the communication unit, an indication message from the arbitration server, the indication message is used to indicate that the storage device can take over the host service; and take over the host service according to the indication message.
The storage device according to claim 15, wherein the processing unit is further configured to pass through the communication unit after the communication link between the storage device and the second storage device returns to normal The arbitration server sends a reservation clear message, where the reservation clear message is used to request the arbitration server to delete the reservation indication information, so that the second storage device performs registration.