CN102761615A - Method and device for realizing data synchronism of long-distance duplication system - Google Patents
Method and device for realizing data synchronism of long-distance duplication system Download PDFInfo
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Abstract
The invention provides a method and device for realizing data synchronism of a long-distance duplication system. The method comprises the following of: when a main storage device detects that network connection between the main storage device and a standby storage device is abnormal, recording data rewritten by mirrored volume generation data; and after the network connection is recovered to be normal, synchronizing the rewritten data to a corresponding mirror volume of the standby storage device. According to the method and the device disclosed by the invention, bitmap identification information is change only if the main storage device detects that the network connection between the devices is abnormal, so that the problem that the data between a main storage mirrored volume and a standby storage mirrored volume is not synchronized, caused by network failures in the long-distance duplication system, can be effectively solved; and therefore, the consistency of the data on the main storage device and the standby storage device is ensured.
Description
Technical Field
The present invention relates to network storage technologies, and in particular, to a method and an apparatus for implementing data synchronization in a remote copy system.
Background
In order to solve the problem of data security in a network storage system, a remote copy technology is introduced, i.e. data on a local primary storage device mirror volume is synchronized to a mirror volume of a remote backup storage device through an IP network, as shown in fig. 1. When the local storage device loses data, the data can be recovered from the standby storage device at different places, so that the high reliability of the data of the storage device is ensured.
In the remote copy technology, when a mirror volume of a main storage device generates data write operation in a state of network failure between two storage devices serving as mirror functions, data cannot be synchronously updated to a backup storage device, which may cause a problem of data asynchronization between the mirror volumes of the two storage devices. In order to solve the problem of data asynchronism, the traditional method firstly compares the data of the distributed data blocks according to the bitmap information of the disk, and then carries out synchronous operation on the inconsistent data according to the comparison result. Because the bitmap information of the disk is huge, if the bitmap information is compared one by one and the operation speed is slow, the synchronization efficiency of the disk is low.
Therefore, there is a need for an improved method for performing data synchronization operation between the data blocks changed in the mirror volume of the primary storage device and the mirror volume of the backup storage device at high speed and high efficiency after the network is restored to normal, so as to ensure the consistency of the data on the primary-backup storage device.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for realizing data synchronization of a remote copy system, which can efficiently perform data synchronization operation between mirror images of a main storage device and a standby storage device after a network is recovered to be normal.
In order to solve the above technical problem, the present invention provides a method for implementing data synchronization of a remote copy system, which relates to a primary storage device and a backup storage device, and comprises:
the main storage device detects that the network connection between the main storage device and the standby storage device is abnormal, and records data rewritten by mirror image volume generated data; and after the network connection is recovered to be normal, synchronizing the rewritten data to the corresponding mirror volume of the standby storage equipment.
Further, the main storage device detects that the network connection with the backup storage device is abnormal, and records data rewritten by the mirror image volume generated data, specifically including:
the application module requests the main storage device for the write operation of the mirror image volume;
and in the process of completing the writing operation of the mirror image volume, when the network connection between the main storage devices is judged to be abnormal, reading the bitmap identification information, and setting the bitmap identification which enables the data block to be changed by the writing operation.
Further, after the network connection is restored to normal, the primary storage device synchronizes the rewritten data to the corresponding mirror volume of the backup storage device, which specifically includes:
the main storage device reads the bitmap identification information of the mirror image volume after the network connection is recovered to normal, reads the data of the data block with changed mirror image volume according to the bitmap identification information, encapsulates the data block with the corresponding bitmap identification information into a data packet and sends the data packet to the standby storage device;
after receiving the data packet, the standby storage equipment writes the data of the corresponding data block in the data packet into the mirror image volume according to the read and analyzed bitmap identification information in the data packet; and then returns synchronization operation success information to the primary storage device.
Further, the method further comprises:
when the main storage device is limited to the specified time threshold, if the synchronization operation success information returned by the standby storage device is received, reading the bitmap identification information, and resetting the corresponding bitmap identification.
Further, the method further comprises:
and when the main storage device is limited to the specified time threshold, if the synchronization operation success information is not received, the data packet is sent to the standby storage device again until the bitmap identification information is received.
In order to solve the technical problem, the invention provides a device for realizing data synchronization of a remote copy system, which is respectively arranged on a main storage device and a standby storage device, and comprises a data read-write module, a network module and a metadata management module which are sequentially connected, and a data sending-receiving module connected with the data read-write module; wherein:
the data read-write module is used for performing read-write operation on the data of the local mirror volume according to the read-write operation request and returning the result of the data read-write operation; calling a metadata management module according to the monitoring result transmitted by the network module or the data transmitted by the metadata management module, or calling a data sending-receiving module according to the monitoring result;
the network module is used for monitoring the network connection between the mirror image volume of the main storage device and the mirror image volume of the standby storage device in real time and transmitting the monitoring result to the data read-write module;
the metadata management module is used for establishing and managing the bitmap identification information, reading and changing the bitmap identification information according to the calling of the data reading and writing module, and returning the corresponding bitmap identification information to the data reading and writing module;
the data sending-receiving module is used for sending the data transmitted by the data reading and writing module to the IP network according to the calling of the data reading and writing module; or the data received from the network is transmitted to the data read-write module.
Further, the air conditioner is provided with a fan,
and the data read-write module performs read-write operation on the data of the local mirror volume according to the read-write operation request of the application module and returns a result of the data read-write operation to the application module.
Further, the air conditioner is provided with a fan,
the data read-write module calls a metadata management module according to the monitoring result of the network connection abnormity; or according to the monitoring result that the network connection is recovered to be normal, encapsulating the data block of the write operation and the bitmap identification information returned by the metadata management module into a data packet, and calling the data sending-receiving module;
the metadata management module reads the bitmap identification information corresponding to the bit according to the bitmap setting instruction transmitted in the calling of the data read-write module, sets the bitmap identification corresponding to the changed data block, and returns the corresponding bitmap identification information to the data read-write module;
and the data sending-receiving module sends the data packet to the IP network according to the calling of the data reading-writing module.
Further, the air conditioner is provided with a fan,
the data reading and writing module reads the data packet transmitted by the analysis data sending-receiving module and carries out synchronous operation on the data of the local mirror volume by the read data block according to the analyzed bitmap identification information;
and the data sending-receiving module transmits the data packet received from the IP network to the data reading-writing module.
Further, the air conditioner is provided with a fan,
after the data read-write module finishes the synchronous operation, the data read-write module returns the information that the data synchronous operation is successful to the data sending-receiving module; or calling the metadata management module according to the information of successful data synchronization operation returned by the data sending-receiving module;
the data sending-receiving module sends the information of successful data synchronization operation returned by the data reading-writing module to the IP network; or the information of successful data synchronization operation received from the IP network is returned to the data read-write module;
and the metadata management module reads the bitmap identification information according to the bitmap reset instruction transmitted in the calling of the data read-write module and resets the bitmap identification corresponding to the data block which completes the synchronous operation.
The invention can efficiently solve the problem of data asynchronism between the main storage mirror image volume and the standby storage mirror image volume caused by network failure in a remote copy system because the bitmap identification information is changed only when the main storage device judges that the network connection between the devices is abnormal, thereby ensuring the consistency of the data on the main storage device and the standby storage device.
Drawings
FIG. 1 is a schematic diagram of a prior art remote copy system;
FIG. 2 is a flowchart of an example write operation of a primary storage device in an embodiment of a method of the present invention;
FIG. 3 is a flowchart illustrating an example of a primary storage device performing data synchronization operations to a backup storage device according to an embodiment of a method of the present invention;
FIG. 4 is a block diagram of an embodiment of an apparatus for implementing data synchronization of a remote copy system.
Detailed Description
The technical solution of the present invention is explained in detail below with reference to the accompanying drawings and preferred embodiments. It should be understood that the following examples are only for illustrating and explaining the present invention and do not constitute a limitation on the technical solution of the present invention.
The embodiment of the method for realizing the data synchronization of the remote copy system of the invention relates to a main storage device and a standby storage device in the remote copy system, comprising the following steps:
the main storage device detects that the network connection between the main storage device and the standby storage device is abnormal, and records data rewritten by mirror image volume generated data; and after the network connection is recovered to be normal, synchronizing the recorded rewritten data to the corresponding mirror volume of the standby storage equipment.
Fig. 2 shows an example of a write operation of the main storage device in the above method embodiment, and the flow thereof includes:
110: the application module requests write operation from the main storage device;
120: the main storage device judges whether the network connection between the devices is normal, if so, the next step is executed, otherwise, the step 140 is executed;
130: finishing the writing operation of the mirror image volume and ending the flow;
140: reading bitmap identification information, and setting a corresponding bitmap identification; execution continues at step 130.
And the main storage device reads the bitmap identification information and changes the bitmap identification of the data block changed by the write operation.
It can be seen from the above writing operation flow that the bitmap identification information is only changed when the main storage device judges that the network connection between the devices is abnormal, and the bitmap identification is not needed when the main storage device and the backup storage device are normal by the normal synchronous operation, so that the capacity of the bitmap identification information is greatly reduced, the operation speed is obviously improved, and the efficiency of data synchronization is improved.
FIG. 3 illustrates an example of a primary storage device and a backup storage device performing data synchronization operations in an embodiment of a method according to the present invention, including respective flows of the two devices; wherein,
the main storage device synchronization operation flow comprises the following steps:
210: reading mirror volume bitmap identification information;
220: reading the data of the changed data block in the mirror image volume according to the bitmap identification information, and packaging the data block and the bitmap identification information into a data packet;
230: sending a data packet to the standby storage device;
240: if the data synchronization operation is finished, executing the next step, otherwise, returning to execute step 230;
the main storage device detects whether the synchronization operation success information returned by the standby storage device is received or not when a specified time threshold is limited, if the synchronization operation success information is received, the data synchronization operation is considered to be completed, and if the synchronization operation is not received, the synchronization operation is considered to be not completed, and the data packet is sent to the standby storage device again.
250: and resetting the corresponding bitmap identification, and ending the flow.
The main storage device resets the bitmap identification information corresponding to the data blocks which have completed the synchronization operation so as to prepare for the next synchronization operation.
The flow of the synchronous operation of the standby storage device comprises the following steps:
310: receiving a data packet of a main storage device;
the spare storage device receives the data packet sent by the primary storage device in step 230.
320: reading bitmap identification information and data blocks in the analysis data packet;
330: writing the corresponding data block into the mirror volume according to the bitmap identification information;
340: and returning the synchronization operation success information to the main storage device, and ending the flow.
The present invention also provides an embodiment of an apparatus for implementing data synchronization of a remote copy system, which is respectively installed on a main storage device and a backup storage device, and has a structure as shown in fig. 4, and includes a data read-write module, a network module and a metadata management module, which are sequentially connected, and also includes a data sending-receiving module connected with the data read-write module; wherein:
the data read-write module is used for performing read-write operation on the data of the local mirror volume according to the read-write operation request and returning the result of the data read-write operation; calling a metadata management module according to the monitoring result transmitted by the network module or the data transmitted by the metadata management module, or calling a data sending-receiving module according to the monitoring result;
the network module is used for monitoring the network connection between the mirror image volume of the main storage device and the mirror image volume of the standby storage in real time and transmitting the monitoring result to the data read-write module;
the metadata management module is used for establishing and managing the bitmap identification information, reading and changing the bitmap identification information according to the calling of the data reading and writing module, and returning the corresponding bitmap identification information to the data reading and writing module;
the data sending-receiving module is used for sending the data transmitted by the data reading and writing module to the IP network according to the calling of the data reading and writing module; or the data received from the network is transmitted to the data read-write module.
In the above-described embodiment of the apparatus,
and the data read-write module performs read-write operation on the data of the local mirror volume according to the read-write operation request of the application module and returns a result of the data read-write operation to the application module.
In the above-described embodiment of the apparatus,
the data read-write module calls a metadata management module according to the monitoring result of the network connection abnormity; or according to the monitoring result that the network connection is recovered to be normal, encapsulating the data block of the write operation and the bitmap identification information returned by the metadata management module into a data packet, and calling the data sending-receiving module;
the metadata management module reads the bitmap identification information corresponding to the bit according to the bitmap setting instruction transmitted in the calling of the data read-write module, sets the bitmap identification corresponding to the changed data block, and returns the corresponding bitmap identification information to the data read-write module;
and the data sending-receiving module sends the data packet to the IP network according to the calling of the data reading-writing module.
In the above-described embodiment of the apparatus,
the data reading and writing module reads the data packet transmitted by the analysis data sending-receiving module and carries out synchronous operation on the data of the local mirror volume by the read data block according to the analyzed bitmap identification information;
and the data sending-receiving module transmits the data packet received from the IP network to the data reading-writing module.
In the above-described embodiment of the apparatus,
after the data read-write module finishes the synchronous operation, the data read-write module returns the information that the data synchronous operation is successful to the data sending-receiving module; or calling the metadata management module according to the information of successful data synchronization operation returned by the data sending-receiving module;
the data sending-receiving module sends the information of successful data synchronization operation returned by the data reading-writing module to the IP network; or the information of successful data synchronization operation received from the IP network is returned to the data read-write module;
and the metadata management module reads the bitmap identification information according to the bitmap reset instruction transmitted in the calling of the data read-write module and resets the bitmap identification corresponding to the data block which completes the synchronous operation.
Claims (10)
1. A method for realizing data synchronization of a remote copy system relates to a primary storage device and a backup storage device, and comprises the following steps:
the main storage device detects that the network connection between the main storage device and the standby storage device is abnormal, and records data rewritten by mirror image volume generated data; and after the network connection is recovered to be normal, synchronizing the rewritten data to a corresponding mirror volume of the standby storage equipment.
2. The method of claim 1, wherein the primary storage device detecting a network connection anomaly with the backup storage device and recording data overwritten by the mirror volume generated data comprises:
the application module requests the main storage device for the write operation of the mirror image volume;
and in the process of completing the writing operation of the mirror image volume, when the network connection between the main storage devices is judged to be abnormal, reading the bitmap identification information, and setting the bitmap identification which enables the data block to be changed by the writing operation.
3. The method as claimed in claim 2, wherein the step of the primary storage device synchronizing the rewritten data to the corresponding mirror volume of the backup storage device after the network connection is restored to normal includes:
the main storage device reads the bitmap identification information of the mirror image volume after the network connection is recovered to normal, reads the data of the data block with changed mirror image volume according to the bitmap identification information, encapsulates the data block with the corresponding bitmap identification information into a data packet and sends the data packet to the standby storage device;
after receiving the data packet, the standby storage device writes the data of the corresponding data block in the data packet into a mirror image volume according to the read and analyzed bitmap identification information in the data packet; and then returning synchronization operation success information to the main storage device.
4. The method of claim 3, further comprising:
and when the main storage device reaches a specified time threshold, if the synchronization operation success information returned by the standby storage device is received, reading the bitmap identification information and resetting the corresponding bitmap identification.
5. The method of claim 4, further comprising:
and when the main storage device is limited to a specified time threshold, if the synchronization operation success information is not received, the data packet is sent to the standby storage device again until the bitmap identification information is received.
6. A device for realizing data synchronization of a remote copy system is respectively arranged on a main storage device and a standby storage device; the device is characterized by comprising a data reading and writing module, a network module and a metadata management module which are sequentially connected, and also comprising a data sending-receiving module connected with the data reading and writing module; wherein:
the data read-write module is used for performing read-write operation on the data of the local mirror volume according to the read-write operation request and returning the result of the data read-write operation; calling a metadata management module according to a monitoring result transmitted by a network module or data transmitted by a metadata management module, or calling a data sending-receiving module according to the monitoring result;
the network module is used for monitoring the network connection between the mirror image volume of the main storage device and the mirror image volume of the standby storage in real time and transmitting the monitoring result to the data read-write module;
the metadata management module is used for establishing and managing the bitmap identification information, reading and changing the bitmap identification information according to the calling of the data reading and writing module, and returning the corresponding bitmap identification information to the data reading and writing module;
the data sending-receiving module is used for sending the data transmitted by the data reading and writing module to the IP network according to the calling of the data reading and writing module; or the data received from the network is transmitted to the data read-write module.
7. The apparatus of claim 6,
and the data read-write module performs read-write operation on the data of the local mirror volume according to the read-write operation request of the application module and returns a result of the data read-write operation to the application module.
8. The apparatus of claim 7,
the data reading and writing module calls the metadata management module according to the monitoring result of the abnormal network connection; or according to the monitoring result that the network connection is recovered to be normal, encapsulating the data block of the write operation and the bitmap identification information returned by the metadata management module into a data packet, and calling the data sending-receiving module;
the metadata management module reads the bitmap identification information corresponding to the bit according to the bitmap setting instruction transmitted in the calling of the data read-write module, sets the bitmap identification corresponding to the changed data block, and returns the corresponding bitmap identification information to the data read-write module;
and the data sending-receiving module sends the data packet to an IP network according to the calling of the data reading-writing module.
9. The apparatus of claim 8,
the data reading and writing module reads and analyzes the data packet transmitted by the data transmitting-receiving module, and performs synchronous operation on the data of the local mirror volume by the read data block according to the analyzed bitmap identification information;
and the data sending-receiving module transmits the data packet received from the IP network to the data reading-writing module.
10. The apparatus of claim 9,
after the data read-write module finishes the synchronous operation, the data read-write module returns the information of successful data synchronous operation to the data sending-receiving module; or calling the metadata management module according to the information of successful data synchronization operation returned by the data sending-receiving module;
the data sending-receiving module sends the information of successful data synchronization operation returned by the data reading-writing module to an IP network; or the information of successful data synchronization operation received from the IP network is returned to the data read-write module;
and the metadata management module reads bitmap identification information according to a bitmap reset instruction transmitted in the calling of the data read-write module and resets the bitmap identification corresponding to the data block which completes the synchronous operation.
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