CN107491270B - Resource access method and device of multi-control storage system - Google Patents
Resource access method and device of multi-control storage system Download PDFInfo
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- CN107491270B CN107491270B CN201710729059.8A CN201710729059A CN107491270B CN 107491270 B CN107491270 B CN 107491270B CN 201710729059 A CN201710729059 A CN 201710729059A CN 107491270 B CN107491270 B CN 107491270B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
- G06F3/0607—Improving or facilitating administration, e.g. storage management by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0658—Controller construction arrangements
Abstract
The application provides a resource access method and a device of a multi-control storage system, wherein the method comprises the following steps: judging whether a logic subspace corresponding to a logic address field carried by an IO request received from the application server is superposed with at least two divided logic subspaces or not; if yes, splitting the IO request into at least two IO sub-requests; searching storage node equipment to which a logic subspace corresponding to a logic address field carried by each IO sub-request belongs; if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server. The method provided by the application is used for improving the resource access performance of the multi-control storage system.
Description
Technical Field
The application relates to the field of computer storage, in particular to a multi-control storage technology.
Background
A multi-control storage system may refer to a storage system comprised of a plurality of storage devices, each of which may include one or more controllers. The controller is a core component of the storage system and is used for data transceiving, data storage, data protection and the like.
However, the performance of resource access of the multi-control storage system directly determines the processing efficiency of the front-end service, and therefore how to improve the resource access performance of the multi-control storage system becomes an urgent problem in the industry.
Disclosure of Invention
In view of this, the present application provides a resource access method for a multi-control storage system, so as to improve the resource access performance of the multi-control storage system.
Specifically, the method is realized through the following technical scheme:
according to a first aspect of the present application, there is provided a resource access method for a multi-control storage system, the method being applied to a target storage node device in the multi-control storage system, the target storage node device being allocated to an application server, an LUN storage unit of the multi-control storage system being divided into several logical subspaces, and the logical subspaces being allocated to each storage node device in the multi-control storage system that is pre-selected, the method including:
judging whether a logic subspace corresponding to a logic address field carried by an IO request received from the application server is superposed with at least two divided logic subspaces or not;
if yes, splitting the IO request into at least two IO sub-requests; wherein, the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in at least two divided logic sub-spaces;
searching storage node equipment to which a logic subspace corresponding to a logic address field carried by each IO sub-request belongs;
if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
According to a second aspect of the present application, there is provided a resource access apparatus for a multi-control storage system, the apparatus being applied to a target storage node device in the multi-control storage system, the target storage node device being allocated to an application server, an LUN storage unit of the multi-control storage system being divided into a plurality of logical subspaces, and the logical subspaces being allocated to each storage node device in the multi-control storage system that is pre-selected to be fetched, the apparatus comprising:
the judging unit is used for judging whether a logic subspace corresponding to a logic address field carried by the IO request received from the application server is superposed with at least two divided logic subspaces or not;
the splitting unit is used for splitting the IO request into at least two IO sub-requests if the IO sub-request is received; wherein, the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in at least two divided logic sub-spaces;
the search unit is used for searching the storage node equipment to which the logic subspace corresponding to the logic address field carried by each IO sub-request belongs;
and the forwarding unit is used for forwarding each IO sub-request to the storage node equipment to which the logic subspace corresponding to the logic address field carried by the IO sub-request belongs respectively if the searched storage nodes are not the storage node equipment, so that each storage node equipment processes the IO sub-request, and returns the processing result to the application server.
The application provides a resource access method of a multi-control storage system, wherein an LUN storage unit of the multi-control storage system is divided into a plurality of logic subspaces, and the divided logic subspaces are distributed to each storage node device which is pre-selected and taken out in the multi-control storage system.
And the target storage node equipment in the multi-control storage system can judge whether the logic subspace corresponding to the logic address field carried by the IO request received from the application server is coincided with at least two logic subspaces. If yes, the target storage node device can split the IO request into at least two IO sub-requests; the logical space corresponding to the logical address field carried by each IO sub-request is respectively contained in each logical sub-space, and the storage node equipment to which the logical sub-space corresponding to the logical address field carried by each IO sub-request belongs can be searched; if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
In addition, the target node device is allocated to the application server, and when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish a proxy LUN storage unit corresponding to the LUN storage unit to be accessed.
On one hand, the storage resources of the LUN are distributed on the plurality of storage node devices, and the management of the LUN storage unit is realized through the management of a plurality of logic subspaces of the LUN storage unit, so that the load balance of each storage node device in the multi-control storage system is realized, and the resource fee access performance of the multi-control storage system is greatly improved.
On the other hand, when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish the proxy LUN storage unit corresponding to the LUN storage unit to be accessed, so that the number of controllers accessible by the application server is no longer limited by 2 or 4, and may be any N, thereby greatly increasing the path bandwidth of the LUN storage unit accessed by the application server. Meanwhile, as long as the controllers of the LUN storage unit nodes do not all fail, service interruption can not be caused, and further, even if the controller of a certain node in the LUN storage unit nodes fails, only the logic subspace on the node can not be accessed, and the logic subspaces on other nodes can also be accessed continuously, so that the fault redundancy performance is greatly increased.
Drawings
FIG. 1 is a flow chart illustrating a method for accessing resources of a multi-control storage system according to an exemplary embodiment of the present application;
FIG. 2 is a hardware block diagram of a storage device in which a resource access apparatus of a multi-control storage system is located according to an exemplary embodiment of the present application;
FIG. 3 is a block diagram illustrating a resource access apparatus of a multi-control storage system according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
A multi-control storage system typically includes a plurality of storage node devices, each having a controller configured thereon. Common multi-control storage systems generally include dual-control storage systems and quad-control storage systems.
In the double-control storage system, two controllers usually operate according to an Active-Active mode or an Active-Passive mode, and when one controller fails, the other controller takes over the service of the failed controller; if both controllers fail at the same time, service disruption will result.
The application server can access the LUN storage unit through two controllers, namely, the LUN storage unit generally has 2 paths, and the path bandwidth is the bandwidth of a single link multiplied by 2; from the redundancy point of view, 1 path disconnection can be tolerated, which would result in service interruption if 2 paths were disconnected simultaneously.
In a four-controller storage system, four controllers provide services simultaneously. The number of fault controllers which can be tolerated by the four-control storage equipment is related to the implementation mode of a manufacturer, and under the optimal condition, 3 controller faults can be tolerated; if 4 controllers fail simultaneously, a service interruption will result. The application server can access the LUN storage unit through four controllers, that is, the LUN storage unit usually has 4 paths, and the path bandwidth is a single link bandwidth multiplied by 4; from a redundancy point of view, a 4-path disconnection can be tolerated, which would result in service interruption if the 4 paths were disconnected simultaneously.
From the above, in the common multi-control storage system, on one hand, the bandwidth of the application server accessing the LUN storage unit is limited by the above dual control and quad control. On the other hand, each storage node device manages its own storage space, so that the service pressure is concentrated on some storage node devices, and the advantages of the multi-control storage system cannot be effectively exerted.
In view of the above, the present application provides a resource access method for a multi-control storage system, where a LUN storage unit of the multi-control storage system is divided into a plurality of logical subspaces, and the divided logical subspaces are allocated to pre-selected storage node devices in the multi-control storage system.
And the target storage node equipment in the multi-control storage system can judge whether the logic subspace corresponding to the logic address field carried by the IO request received from the application server is coincided with at least two logic subspaces. If yes, the target storage node device can split the IO request into at least two IO sub-requests; the logical space corresponding to the logical address field carried by each IO sub-request is respectively contained in each logical sub-space, and the storage node equipment to which the logical sub-space corresponding to the logical address field carried by each IO sub-request belongs can be searched; if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
In addition, the target node device is allocated to the application server, and when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish a proxy LUN storage unit corresponding to the LUN storage unit to be accessed.
On one hand, the storage resources of the LUN are distributed on the plurality of storage node devices, and the management of the LUN storage unit is realized through the management of a plurality of logic subspaces of the LUN storage unit, so that the load balance of each storage node device in the multi-control storage system is realized, and the resource fee access performance of the multi-control storage system is greatly improved.
On the other hand, when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish the proxy LUN storage unit corresponding to the LUN storage unit to be accessed, so that the number of controllers accessible by the application server is no longer limited by 2 or 4, and may be any N, thereby greatly increasing the path bandwidth of the LUN storage unit accessed by the application server. Meanwhile, as long as the controllers of the LUN storage unit nodes do not all fail, service interruption can not be caused, and further, even if the controller of a certain node in the LUN storage unit nodes fails, only the logic subspace on the node can not be accessed, and the logic subspaces on other nodes can also be accessed continuously, so that the fault redundancy performance is greatly increased.
Referring to fig. 1, fig. 1 is a flowchart illustrating a resource access method of a multi-control storage system according to an exemplary embodiment of the present application. The method is applied to target storage node equipment in a multi-control storage system, the target storage node equipment is distributed to an application server, LUN storage units of the multi-control storage system are divided into a plurality of logic subspaces, and the logic subspaces are distributed to each storage node equipment which is pre-selected and taken out in the multi-control storage system, and the method comprises steps 101 to 104.
Step 101: and judging whether a logic subspace corresponding to a logic address field carried by the IO request received from the application server is superposed with the at least two divided logic subspaces.
Step 102: if yes, splitting the IO request into at least two IO sub-requests; and the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in the at least two divided logic sub-spaces.
Step 103: and searching the storage node equipment to which the logic subspace corresponding to the logic address field carried by each IO sub-request belongs.
Step 104: if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
In the embodiment of the application, the storage resources of the LUNs are distributed on the plurality of storage node devices, and the LUN storage units are managed by managing the logical subspaces of the plurality of LUN storage units, so that the storage node devices in the multi-control storage system achieve load balancing, and the resource fee access performance of the multi-control storage system is greatly improved.
The resource access method of the multi-control storage system provided by the present application is described in detail in the following two aspects of LUN storage unit creation, LUN segment table creation, and resource access of the multi-control storage system.
1) LUN storage Unit creation and LUN segment Table creation
In general, a storage node management device may exist in a multi-control storage system, and the storage node management device is mainly used for managing storage node devices in the multi-control storage system. In this embodiment, the storage node device may perform creation, division, and allocation of LUN storage units.
In a multi-control storage system, a plurality of storage node devices are typically included. When creating the LUN storage unit, the storage node management device may create a LUN storage unit of a preset capacity, and then may select several storage node devices in the multi-control storage system. The storage node management device may determine, first, a capacity of the LUN storage unit that may be allocated to each storage node device, then divide the created LUN storage unit into a plurality of logical subspaces, and then allocate the logical subspaces to the selected plurality of storage node devices, respectively, so that a total capacity of the logical subspaces allocated on each storage node device is equal to a capacity of the LUN storage unit determined by the storage node management device for the storage node device.
After being allocated to either one or more logical subspaces, the storage node device may partition a physical subspace corresponding to the allocated logical subspace to correspond to the logical subspace.
In the embodiment of the present application, when determining the capacity of the LUN storage unit allocated to each storage node device, in an alternative implementation, the storage node management device may allocate the capacity of the LUN to each storage node device in a capacity-average allocation manner. The storage node management device may equally divide the capacity of the LUN storage unit into a plurality of shares, each of which is the capacity of the LUN storage unit corresponding to each storage node device.
For example, assuming that the logical capacity of the LUN storage unit is 1000GB, five storage node devices, device1 to device 5, respectively, are selected. The storage node management device may divide the capacity of the LUN storage unit into five shares, each having a capacity of 200GB, on average. The capacity of the LUN storage unit that can be allocated to each storage node device is 200 GB.
In another alternative implementation manner, the storage node management device may divide the LUN storage unit capacity by using the capacity of the LUN storage unit that is defined by the user and allocated for each selected storage node device.
For example, assuming that the logical capacity of the LUN storage unit is 1000GB, there are 6 storage node devices in the multi-control storage system, and 3 storage node devices are selected, which are device1, device2, and device3, respectively. The user defines that device1 is allocated 200GB of capacity, device2 is allocated 400GB of capacity, and device3 is allocated 400GB of capacity.
The storage node management device can divide the LUN storage unit into 3 parts according to the definition of a user, and the capacity is 200GB, 400GB and 400GB respectively. The storage node management apparatus may determine the capacities allocated to the device1, the device2, and the device3 to be 200GB, 400GB, and 400GB, respectively.
In the embodiment of the present application, when the created LUN storage unit is divided into several logical subspaces, in an alternative implementation, the storage node management device may divide the LUN storage unit into the same logical subspaces as the total number of the selected storage node devices.
Still taking the above created LUN capacity as 1000GB, and selecting 3 storage node devices as an example, the storage node management device may determine the capacities allocated to device1, device2, and device3 as 200GB, 400GB, and 400GB, respectively. The storage node device may divide the LUN storage unit into 3 logical subspaces, which are respectively a logical subspace 1, a logical subspace 2, and a logical subspace 3, and the capacities of the three logical subspaces are respectively 200GB, 400GB, and 400 GB. The storage node management apparatus may allocate the logical subspaces 1 to 3 to the apparatuses 1 to 3, respectively. Device1 may allocate 200GB of physical subspace corresponding to the allocated logical subspace 1, device2 may allocate 400GB of physical subspace corresponding to the allocated logical subspace 2, and device3 may allocate 400GB of physical subspace corresponding to the allocated logical subspace 3.
In another alternative implementation manner, the storage node management device may divide the LUN storage unit into a plurality of logical subspaces, where the total number of the divided logical subspaces is greater than the number of the selected storage nodes. Each storage node device may be allocated to multiple logical subspaces. The plurality of logical subspaces allocated to each storage node device may be continuous logical subspaces or discontinuous logical subspaces, and are not specifically limited herein. In this allocation mode, the number of logical subspaces allocated on each storage node depends on the size of the storage capacity of the LUN determined for the storage node device by the storage node management.
Still taking the above created LUN capacity as 1000GB, and selecting 3 storage node devices as an example, the storage node management device may determine the capacities allocated to device1, device2, and device3 as 200GB, 400GB, and 400GB, respectively. Assuming that the storage node management device divides the LUN storage unit into 100 logical subspaces, the capacity of each logical subspace is 10GB, each storage node device can be allocated to multiple logical subspaces, and the number of the logical subspaces allocated to the 3 storage node devices is 20, 40, and 40 in turn. The device1 may divide 20 physical subspaces with a capacity of 10GB to correspond to the 20 allocated logical subspaces, the device2 may divide 40 physical subspaces with a capacity of 10GB to correspond to the 40 allocated logical subspaces, and the device3 may divide 40 physical subspaces with a capacity of 10GB to correspond to the 40 allocated logical subspaces.
Of course, the above-mentioned method for determining the capacity of the LUN storage space corresponding to each storage node device and allocating the logical subspace to each storage node device is not specifically limited here.
In this embodiment, after completing the allocation of the logical subspace, the storage node management device may create a total LUN segment table. The total LUN segment table records a logical subspace, a storage node device to which the logical subspace belongs, and a corresponding relationship between the logical subspace and a physical subspace on the storage node device to which the logical subspace belongs.
Generally, the logical subspace in the total LUN segment table may be represented by a logical address segment of the logical subspace, the storage node device to which the logical subspace belongs may be represented by a device identifier of the storage node device, and the physical subspace on the storage node device to which the logical subspace belongs may be represented by an identifier of the physical subspace. Of course, the physical subspace on the storage node device to which the above-mentioned logical subspace belongs may be represented by a physical address segment of the physical subspace, and is not specifically limited herein.
Still taking the LUN created as above with a capacity of 1000GB, 3 storage node devices are selected as an example. The logical subspaces allocated to the devices 1 to 3 are respectively logical subspaces 1 to 3, the capacities of the logical subspaces 1 to 3 are respectively 200GB, 400GB and 400GB, and the logical address segments corresponding to the logical subspaces 1 to 3 are respectively 0-200GB, 201GB-600GB and 601GB-1000 GB. Device identifications of device1 to device3 are device1, device2, and device3, respectively. If the identification bit ID1 of the physical subspace allocated by the device1 to the logical subspace 1, the identification 2 of the physical subspace allocated by the device2 to the logical subspace is ID2, and the identification 3 of the physical subspace allocated by the device3 to the logical subspace is ID3, the generated total LUN segment table is shown in table 1.
TABLE 1
In this embodiment, after generating the total LUN segment table, the storage node management device may issue the total LUN segment table to each selected storage node device.
In order to save storage space, the selected storage node device may only extract the corresponding relationship between the logical subspace of the device, the device identifier, and the physical subspace on the device corresponding to the logical subspace, and the corresponding relationship between the logical subspace of other storage node devices and the storage node device to which the logical subspace belongs, to form the LUN segment table on the device.
Still taking the LUN capacity created as above as 1000GB, 3 storage node devices are selected, and the total LUN segment table generated is table 1 as an example.
For device1, device1 may extract a logical subspace (e.g., 0-200GB) in the segment table, an identifier of the device (e.g., the identifier of device1 may be replaced by a local identifier, such as local identifier, to indicate local), and a physical subspace (e.g., ID1) on the device corresponding to the logical subspace, to generate a LUN segment table entry for the device. Then, the corresponding logical subspaces (e.g., 201GB-600GB, 601GB-1000GB) of the device2 and the device3 and the device identifications (e.g., device2 and device3) of the device2 and the device3 may be extracted to generate LUN segment table entries for the device2 and the device3, and the LUN segment table entries on the final device are generated from the three segment table entries. The LUN segment table on this device is shown in table 2.
TABLE 2
In the same way, the LUN segment table generated by device2 is shown in Table 3.
TABLE 3
In the same way, the LUN segment table generated by device3 is shown in Table 4.
TABLE 4
In this embodiment, the selected storage node device may also directly use the total LUN segment table issued by the storage node management device as the LUN segment table on the device. Here, the LUN segment table on each storage node device is not specifically limited.
Generally, a multi-control storage system may provide several storage node devices to an application server. The storage node device provided to the application server may be a storage node device to which the logical subspace belongs, or may be a storage node device to which neither the logical subspace belongs.
In this embodiment, when none of the target storage node devices is a storage node device to which the logical subspace belongs, the target storage node device may create a proxy LUN storage unit corresponding to the LUN storage unit, and may obtain a correspondence relationship between each logical subspace and the storage node device to which the logical subspace belongs.
For example, with the LUN capacity created as described above being 1000GB, 3 storage node devices are selected, and the total LUN segment table generated is table 1.
Assume that the multi-control storage system provides device1 and device3, and device 5 to the application server. Assume that the target storage node device is device 5.
The device 5 may create a proxy LUN storage unit, and may obtain a correspondence between each logical subspace and a storage node device to which the logical subspace belongs, and generate a LUN segment table on the device 5, as shown in table 5.
TABLE 5
2) Resource access for multi-control storage system
In the embodiment of the application, when the target storage node device in the multi-control storage system is provided to the application server, the resource of the multi-control storage system can be accessed in the following manner.
The target storage node device can receive an IO request issued by an application server and can acquire a logical address field carried in the IO request. The IO request may be a read IO request or a write IO request.
And the target storage node equipment can judge whether the logic subspace corresponding to the acquired logic address field is superposed with the at least two divided logic subspaces or not through a local LUN field table. If the obtained logical subspace corresponding to the logical address segment at least coincides with the at least two divided logical subspaces, the IO request can be split into at least two IO sub-requests according to the local LUN segment table, so that the logical space corresponding to the logical address segment carried by each IO sub-request respectively includes at least two of the logical subspaces.
The target storage node device may search for a storage node device to which a logical subspace corresponding to a logical address field carried by each IO sub-request belongs, and if none of the searched storage nodes is the local storage node device, may forward each IO sub-request to a storage node device to which a logical subspace corresponding to a logical address field carried by the IO sub-request belongs, and each storage node device processes the IO sub-request. Each storage node device can return the processing result of the IO sub-request to the target storage node device, and the target storage node device can summarize the processing result of the IO sub-request and return the processing result to the application server.
Still taking the created LUN capacity as 1000GB, 3 storage node devices are selected, the generated total LUN segment table is table 1, and the LUN segment tables corresponding to device1 to device3 are tables 2 to 4, respectively, as an example.
Assume that the multi-control storage system provides device1 and device3, and device 5 to the application server. Assume that the target storage node device is device 1.
The device1 may receive an IO request issued by the application server, and may obtain a logical address field carried by the IO request. The logical address field carried by the IO request is assumed to be 598GB-603 GB.
Device1 may look up LUN segment table, such as table 2, and then split the IO request into two IO sub-requests, which are denoted as IO sub-request 1 and IO sub-request 2, respectively. The logical address field carried by the IO sub-request 1 is 598GB-600GB, and the logical address field carried by the IO sub-request 2 is 601GB-603 GB.
The device can search the storage node devices to which the logical subspaces corresponding to the logical address fields carried by the IO sub-request 1 and the IO sub-request 2 belong in the local LUN segment table. Through the lookup table 2, it can be known that the storage node device to which the logical subspace corresponding to the logical address field carried by the IO sub-request 1 belongs is device2, and the storage node device to which the logical subspace corresponding to the logical address field carried by the IO sub-request 2 belongs is device 3.
After table lookup, the device1 finds that all storage node devices to which the logical subspaces corresponding to the logical address fields carried by the two IO sub-requests belong are not the device, and the device1 can forward the IO sub-request 1 and the IO sub-request 2 to the device2 and the device3 respectively. The device2 may search the LUN segment table, such as table 3, obtain the physical space corresponding to the IO sub-request 1 received by the device, and then process the IO sub-request. And may report the processing result of the IO sub-request to the device 1. The device3 may search the LUN segment table, such as table 4, obtain the physical space corresponding to the IO sub-request 2 received by the device, and then process the IO sub-request. And may report the processing result of the IO sub-request to the device 1. The device1 summarizes the processing results of the IO sub-requests and reports the summarized processing results to the application server.
When the target storage node device is device 5, the method for processing the IO request is the same as that of device1, and is not described here again.
In this embodiment of the present application, after searching for a storage node device to which a logical subspace corresponding to a logical address field carried by each IO sub-request belongs, if at least one found storage node is the storage node device, the target storage node device may process the IO sub-request corresponding to the storage node device. Then, the target storage node device may forward the other IO sub-requests to the storage node devices to which the logical sub-spaces corresponding to the logical address fields carried by the IO sub-requests belong, and the IO sub-requests are processed by the other storage node devices. The target storage node device may report a processing result of each IO sub-request to the application server.
Still, with the created LUN capacity of 1000GB, 3 storage node devices are selected, the generated total LUN segment table is table 1, and the LUN segment tables corresponding to the devices 1 to 3 are tables 2 to 4, respectively.
Assume that the multi-control storage system provides device1 and device3, and device 5 to the application server. Assume that the target storage node device is device 1.
The device1 may receive an IO request issued by the application server, and may obtain a logical address field carried by the IO request. Assume that the logical address segment carried by the IO request is 198GB-203 GB.
Device1 may look up LUN segment table, such as table 2, and then split the IO request into two IO sub-requests, which are denoted as IO sub-request 1 and IO sub-request 2, respectively. The logical address field carried by the IO sub-request 1 is 198GB-200GB, and the logical address field carried by the IO sub-request 2 is 201GB-203 GB.
The device can search the storage node devices to which the logical subspaces corresponding to the logical address fields carried by the IO sub-request 1 and the IO sub-request 2 belong in the local LUN segment table. Through the lookup table 2, it can be known that the storage node device to which the logical subspace corresponding to the logical address field carried by the IO sub-request 1 belongs is the present device, that is, the storage node device to which the logical subspace corresponding to the logical address field carried by the IO sub-request 2 belongs is the device 2.
After table lookup, the device1 finds that the storage node device to which the logical subspace corresponding to the logical address field carried by the IO sub-request 1 belongs is the device, and the device1 can search the LUN field table, i.e., table 2, on the device, obtain the physical space corresponding to the IO sub-request, and then process the IO sub-request. At the same time, device1 may also forward IO sub-request 2 to device 2. The device2 may search the LUN segment table, such as table 3, obtain the physical space corresponding to the IO sub-request 2, and then process the IO sub-request 2. And may report the processing result of the IO sub-request to the device 1. The device1 summarizes the processing results of the IO sub-requests and reports the summarized processing results to the application server.
In this embodiment of the present application, if the obtained logical subspace corresponding to the logical address segment does not coincide with the at least two partitioned logical subspaces, the target storage node device may search, through an LUN segment table, such as table 2, for a storage node device to which the logical subspace corresponding to the logical address segment carried in the IO request belongs.
If the searched storage node device is the local storage node device, the target storage node device can process the IO request and send a processing result to the application server. If the found storage node device is not the local storage node device, the IO request is forwarded to the found storage node device so that the storage node device processes the IO request, receives a processing result returned by the storage node device, and reports the processing result to the application server.
For example, with the LUN capacity created as described above being 1000GB, 3 storage node devices are selected, the generated total LUN segment table is table 1, and the LUN segment tables corresponding to device1 to device3 are tables 2 to 4, respectively.
Assume that the multi-control storage system provides device1 and device3, and device 5 to the application server. Assume that the target storage node device is device 1.
The device1 may receive two IO requests issued by the application server, and the two IO requests are respectively denoted as an IO request 1 and an IO request 2. The logical address field carried by the IO request 1 is 10GB-12 GB. The logical address field carried by the IO request 2 is 210GB-212 GB.
The device1 may look up the LUN segment table shown in table 2, and after looking up the LUN segment table, the device1 determines that the logical subspace corresponding to the two IO requests carrying the logical address segment is not overlapped with the at least two divided logical subspaces. The device1 may respectively search for storage node devices to which the logical subspaces corresponding to the logical address fields carried in the IO request 1 and the IO request 2 belong. After looking up the LUN segment table shown in table 2, the device1 determines that the storage node device to which the logical subspace corresponding to the logical address segment carried in the IO request 1 belongs is the device, and the storage node device to which the logical subspace corresponding to the logical address segment carried in the IO request 2 belongs is the device 2.
The device1 may search the LUN segment table, i.e. table 2, on the device, obtain the physical space corresponding to the IO request 1, then process the IO request 1, and report the processing result to the application server. Meanwhile, the device1 may also forward the IO requests 2 to the devices 2, respectively. The device2 may search the LUN segment table, for example, as in table 3, obtain the physical space corresponding to the IO request 2 received by the device2, process the IO request 2, report the processing result of the IO request 2 to the device1, and report the processing result to the application server by the device 1.
The application provides a resource access method of a multi-control storage system, wherein an LUN storage unit of the multi-control storage system is divided into a plurality of logic subspaces, and the divided logic subspaces are distributed to each storage node device which is pre-selected and taken out in the multi-control storage system.
And the target storage node equipment in the multi-control storage system can judge whether the logic subspace corresponding to the logic address field carried by the IO request received from the application server is coincided with at least two logic subspaces. If yes, the target storage node device can split the IO request into at least two IO sub-requests; the logical space corresponding to the logical address field carried by each IO sub-request is respectively contained in each logical sub-space, and the storage node equipment to which the logical sub-space corresponding to the logical address field carried by each IO sub-request belongs can be searched; if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
In addition, the target node device is allocated to the application server, and when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish a proxy LUN storage unit corresponding to the LUN storage unit to be accessed.
On one hand, the storage resources of the LUN are distributed on the plurality of storage node devices, and the management of the LUN storage unit is realized through the management of a plurality of logic subspaces of the LUN storage unit, so that the load balance of each storage node device in the multi-control storage system is realized, and the resource fee access performance of the multi-control storage system is greatly improved.
On the other hand, when the LUN storage unit to be accessed by the application server does not exist on the target storage node device, the target storage node device may establish the proxy LUN storage unit corresponding to the LUN storage unit to be accessed, so that the number of controllers accessible by the application server is no longer limited by 2 or 4, and may be any N, thereby greatly increasing the path bandwidth of the LUN storage unit accessed by the application server. Meanwhile, as long as the controllers of the LUN storage unit nodes do not all fail, service interruption can not be caused, and further, even if the controller of a certain node in the LUN storage unit nodes fails, only the logic subspace on the node can not be accessed, and the logic subspaces on other nodes can also be accessed continuously, so that the fault redundancy performance is greatly increased.
Corresponding to the embodiment of the resource access method of the multi-control storage system, the application also provides an embodiment of a resource access device of the multi-control storage system.
The embodiment of the resource access device of the multi-control storage system can be applied to the storage node equipment. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. Taking a software implementation as an example, as a device in a logical sense, the device is formed by reading a corresponding computer program instruction in a nonvolatile memory into an internal memory through a processor of a storage node device where the device is located to operate. In terms of hardware, as shown in fig. 2, the present application is a hardware structure diagram of a storage node device where a resource access apparatus of a multi-control storage system is located, where the storage node device where the apparatus is located in the embodiment may further include other hardware according to an actual function of the storage node device, except for the processor, the memory, the network output interface, and the nonvolatile memory shown in fig. 2, and this is not described again.
Referring to fig. 3, fig. 3 is a block diagram illustrating a resource access apparatus of a multi-control storage system according to an exemplary embodiment of the present application. The device can be applied to target storage node equipment in a multi-control storage system, the target storage node equipment is distributed to an application server, an LUN storage unit of the multi-control storage system is divided into a plurality of logic subspaces, the logic subspaces are distributed to each storage node equipment which is pre-selected and taken out in the multi-control storage system, and the device comprises the following units.
A determining unit 301, configured to determine whether a logical subspace corresponding to a logical address segment carried in an IO request received from the application server coincides with at least two of the divided logical subspaces;
a splitting unit 302, configured to split the IO request into at least two IO sub-requests if yes; wherein, the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in at least two divided logic sub-spaces;
a searching unit 303, configured to search for a storage node device to which a logical subspace corresponding to a logical address field carried by each IO sub-request belongs;
a forwarding unit 304, configured to forward each IO sub-request to a storage node device to which a logical sub-space corresponding to a logical address field carried by the IO sub-request belongs, respectively, if none of the found storage nodes is the storage node device, so that each storage node device processes the IO sub-request, and returns a processing result to the application server.
Optionally, the apparatus further comprises:
a processing unit 305, configured to process an IO sub-request corresponding to the storage node device if the at least one found storage node is the storage node device;
the forwarding unit 304 is further configured to forward other IO sub-requests to storage node devices to which the logical sub-spaces corresponding to the logical address segments carried by the IO sub-requests belong, respectively, so that the IO sub-requests are processed by the other storage node devices; and reporting the processing result of each IO sub-request to the application server.
Optionally, the searching unit 303 is further configured to, if the logical address field carried by the IO request does not belong to the storage node device, search for a storage node device to which a logical subspace corresponding to the logical address field belongs;
the processing unit 305 is further configured to process the IO request if the found storage node device is the local storage node device, and send a processing result to the application server;
the forwarding unit 304 is further configured to forward the IO request to the found storage node device if the found storage node device is not the local storage node device, so that the storage node device processes the IO request, receives a processing result returned by the storage node device, and reports the processing result to the application server.
Optionally, the target storage node device records a LUN segment table, where the LUN segment table records a logical subspace of a LUN storage unit, a storage node device to which the logical subspace belongs, and a corresponding relationship between physical subspaces on the storage node device to which the logical subspace corresponds;
the searching unit 303 is specifically configured to search, in the LUN segment table, storage node devices to which logical subspaces corresponding to logical address segments carried by the IO sub-requests belong respectively.
Optionally, the multi-control storage system includes a storage node management device;
the LUN segment table is created as follows:
the storage node management equipment creates an LUN storage unit;
the storage node management equipment divides the created LUN storage unit into a plurality of logical subspaces according to a preset rule;
the storage node management equipment allocates each divided logic subspace to each storage node equipment which is pre-selected and taken out, so that each logic subspace corresponds to a physical subspace on the storage node equipment to which the logic subspace belongs;
the storage node management equipment establishes the corresponding relation among each logic subspace, the storage node equipment to which the logic subspace belongs and the physical subspace on the storage node equipment to which the logic subspace belongs, and forms a total LUN segment table;
the storage node management device issues the total LUN segment table to the target storage node device as the LUN segment table of the target storage node device;
or, the storage node device issues the total LUN segment table to the target storage node device, and the target storage node device extracts, from the total LUN segment table, a correspondence between a logical subspace of the device, a device identifier of the device, and a physical subspace of the device corresponding to the logical subspace, and a correspondence between a logical subspace of another storage node device, and a storage node device to which the logical subspace belongs, to form the LUN segment table on the device.
Optionally, the apparatus further comprises:
a creating unit 306, configured to create a proxy LUN storage unit corresponding to the LUN storage unit if none of the target storage node devices is a storage node device to which each logical subspace of the LUN storage unit belongs; and acquiring the corresponding relation between each logic subspace and the storage node equipment to which the logic subspace belongs, and generating the LUN segment table.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (12)
1. A resource access method of a multi-control storage system is applied to a target storage node device in the multi-control storage system, the target storage node device is allocated to an application server, an LUN storage unit of the multi-control storage system is divided into a plurality of logic subspaces, and the logic subspaces are allocated to each storage node device which is pre-selected and taken out in the multi-control storage system, and the method comprises the following steps:
judging whether a logic subspace corresponding to a logic address field carried by an IO request received from the application server is superposed with at least two divided logic subspaces or not;
if yes, splitting the IO request into at least two IO sub-requests; wherein, the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in at least two divided logic sub-spaces;
searching storage node equipment to which a logic subspace corresponding to a logic address field carried by each IO sub-request belongs;
if the found storage nodes are not the storage node equipment, the IO sub-requests are respectively forwarded to the storage node equipment to which the logic sub-space corresponding to the logic address field carried by the IO sub-requests belongs, so that the IO sub-requests are processed by the storage node equipment, and the processing result is returned to the application server.
2. The method of claim 1, further comprising:
if at least one found storage node is the storage node equipment, processing an IO sub-request corresponding to the storage node equipment;
respectively forwarding other IO sub-requests to storage node equipment to which a logic subspace corresponding to a logic address field carried by the IO sub-request belongs, so that the IO sub-requests are processed by other storage node equipment;
and reporting the processing result of each IO sub-request to the application server.
3. The method of claim 1, further comprising:
if not, searching the storage node equipment to which the logic subspace corresponding to the logic address field carried by the IO request belongs;
if the searched storage node equipment is the local storage node equipment, processing the IO request and sending a processing result to the application server;
if the found storage node device is not the local storage node device, the IO request is forwarded to the found storage node device so that the storage node device processes the IO request, receives a processing result returned by the storage node device, and reports the processing result to the application server.
4. The method according to claim 1, wherein the target storage node device records a LUN segment table, and the LUN segment table records a logical subspace of a LUN storage unit, a correspondence between a storage node device to which the logical subspace belongs and a physical subspace on the storage node device to which the logical subspace corresponds;
the searching for the storage node device to which the logical subspace corresponding to the logical address field carried by each IO sub-request belongs includes:
and respectively searching storage node equipment to which the logic subspace corresponding to the logic address field carried by each IO sub-request belongs in the LUN field table.
5. The method of claim 4, wherein the multi-control storage system comprises a storage node management device;
the LUN segment table is created as follows:
the storage node management equipment creates an LUN storage unit;
the storage node management equipment divides the created LUN storage unit into a plurality of logical subspaces according to a preset rule;
the storage node management equipment allocates each divided logic subspace to each storage node equipment which is pre-selected and taken out, so that each logic subspace corresponds to a physical subspace on the storage node equipment to which the logic subspace belongs;
the storage node management equipment establishes the corresponding relation among each logic subspace, the storage node equipment to which the logic subspace belongs and the physical subspace on the storage node equipment to which the logic subspace belongs, and forms a total LUN segment table;
the storage node management device issues the total LUN segment table to the target storage node device as the LUN segment table of the target storage node device;
or, the storage node device issues the total LUN segment table to the target storage node device, and the target storage node device extracts, from the total LUN segment table, a correspondence between a logical subspace of the device, a device identifier of the device, and a physical subspace of the device corresponding to the logical subspace, and a correspondence between a logical subspace of another storage node device, and a storage node device to which the logical subspace belongs, to form the LUN segment table on the device.
6. The method of claim 4, further comprising:
if the target storage node equipment is not the storage node equipment to which each logic subspace of the LUN storage unit belongs, establishing a proxy LUN storage unit corresponding to the LUN storage unit;
and acquiring the corresponding relation between each logic subspace and the storage node equipment to which the logic subspace belongs, and generating the LUN segment table.
7. A resource access apparatus of a multi-control storage system, the apparatus being applied to a target storage node device in the multi-control storage system, the target storage node device being allocated to an application server, a LUN storage unit of the multi-control storage system being divided into a plurality of logical subspaces, and the logical subspaces being allocated to each storage node device in the multi-control storage system, the apparatus comprising:
the judging unit is used for judging whether a logic subspace corresponding to a logic address field carried by the IO request received from the application server is superposed with at least two divided logic subspaces or not;
the splitting unit is used for splitting the IO request into at least two IO sub-requests if the IO sub-request is received; wherein, the logic space corresponding to the logic address field carried by each IO sub-request is respectively contained in at least two divided logic sub-spaces;
the search unit is used for searching the storage node equipment to which the logic subspace corresponding to the logic address field carried by each IO sub-request belongs;
and the forwarding unit is used for forwarding each IO sub-request to the storage node equipment to which the logic subspace corresponding to the logic address field carried by the IO sub-request belongs respectively if the searched storage nodes are not the storage node equipment, so that each storage node equipment processes the IO sub-request, and returns the processing result to the application server.
8. The apparatus of claim 7, further comprising:
the processing unit is used for processing the IO sub-request corresponding to the storage node equipment if the at least one searched storage node is the storage node equipment;
the forwarding unit is further configured to forward the other IO sub-requests to storage node devices to which the logical subspaces corresponding to the logical address fields carried by the IO sub-requests belong, respectively, so that the IO sub-requests are processed by the other storage node devices; and reporting the processing result of each IO sub-request to the application server.
9. The apparatus according to claim 7, wherein the searching unit is further configured to, if not, search for a storage node device to which a logical subspace corresponding to the logical address field carried in the IO request belongs;
the device further comprises: a processing unit;
the processing unit is further configured to process the IO request and send a processing result to the application server if the found storage node device is the local storage node device; the forwarding unit is further configured to forward the IO request to the found storage node device if the found storage node device is not the local storage node device, so that the storage node device processes the IO request, receive a processing result returned by the storage node device, and report the processing result to the application server.
10. The apparatus according to claim 7, wherein the target storage node device records a LUN segment table, and the LUN segment table records a logical subspace of a LUN storage unit, a correspondence between a storage node device to which the logical subspace belongs and a physical subspace on the storage node device to which the logical subspace corresponds;
the search unit is specifically configured to search, in the LUN segment table, storage node devices to which logical subspaces corresponding to logical address segments carried by the IO sub-requests belong, respectively.
11. The apparatus of claim 10, wherein the multi-control storage system comprises a storage node management device;
the LUN segment table is created as follows:
the storage node management equipment creates an LUN storage unit;
the storage node management equipment divides the created LUN storage unit into a plurality of logical subspaces according to a preset rule;
the storage node management equipment allocates each divided logic subspace to each storage node equipment which is pre-selected and taken out, so that each logic subspace corresponds to a physical subspace on the storage node equipment to which the logic subspace belongs;
the storage node management equipment establishes the corresponding relation among each logic subspace, the storage node equipment to which the logic subspace belongs and the physical subspace on the storage node equipment to which the logic subspace belongs, and forms a total LUN segment table;
the storage node management device issues the total LUN segment table to the target storage node device as the LUN segment table of the target storage node device;
or, the storage node device issues the total LUN segment table to the target storage node device, and the target storage node device extracts, from the total LUN segment table, a correspondence between a logical subspace of the device, a device identifier of the device, and a physical subspace of the device corresponding to the logical subspace, and a correspondence between a logical subspace of another storage node device, and a storage node device to which the logical subspace belongs, to form the LUN segment table on the device.
12. The apparatus of claim 10, further comprising:
a creating unit, configured to create a proxy LUN storage unit corresponding to the LUN storage unit if none of the target storage node devices is a storage node device to which each logical subspace of the LUN storage unit belongs; and acquiring the corresponding relation between each logic subspace and the storage node equipment to which the logic subspace belongs, and generating the LUN segment table.
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