CN103002035A - Data synchronization method and server for supporting multi-protocol link - Google Patents
Data synchronization method and server for supporting multi-protocol link Download PDFInfo
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- CN103002035A CN103002035A CN2012105198908A CN201210519890A CN103002035A CN 103002035 A CN103002035 A CN 103002035A CN 2012105198908 A CN2012105198908 A CN 2012105198908A CN 201210519890 A CN201210519890 A CN 201210519890A CN 103002035 A CN103002035 A CN 103002035A
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Abstract
The invention provides a data synchronization method and server for supporting a multi-protocol link. The server comprises a copying operation module, an initiating module and a metadata module. The copying operation module is used for initiating small computer system interface (SCSI) commands for requesting metadata, sends the SCSI commands to the initiating module, receives read results returned by the initiating module, sends call request to the metadata module, receives the returned metadata, compares the read results with the metadata, constructs read or write-in request according to comparison results, and synchronizes data of both the server and a backup server. The initiating module is used for enabling the SCSI commands from the copying operation module to be packaged into link protocol commands and then handing over the link protocol commands to an object module in the backup server, receives the returned read results, and sends the read results to the copying operation module. The metadata module is used for reading local metadata according to the sent call request and returns the read metadata. The data synchronization method and server can support various link protocols.
Description
Technical field
The present invention relates to the computer data field of storage, relate in particular to a kind of method of data synchronization and server of supporting the multi-protocols link.
Background technology
Along with constantly popularizing of computer application, the computer user is also growing to the requirement of data safety.The loss of data that various natural and man-made calamities cause may bring great loss to the user, so occurred can be with the remote copy technology of real time data synchronization to the remote server.At the time of emergency, can utilize the data that backup on the remote server that the data on the home server are recovered, ensure the physical security of data.
In a remote copy system, home server and remote server need to couple together by network link, and come the transmission of data with certain link protocol.General remote copy software is only supported a kind of link protocol at present.Be limited by the development of network link hardware corresponding to this kind link protocol, the communication speed between home server and remote server promotes comparatively difficulty, may be difficult to satisfy the user to the requirement of performance.
If the user need to use another kind of type of network link, then needing increases special-purpose link protocol switching software, and a kind of link protocol is converted to another kind of link protocol.But owing to software changes the mechanism that the transmission mechanism of the computational resource that can take in a large number server, different agreement differs greatly, other hardware lacks the reasons such as optimization to the agreement after the conversion in the link, change and to produce significantly impact to network performance in the link protocol aspect, also increase the difficulty of user's configuration store server, improved user's use cost.
Summary of the invention
The invention provides a kind of method of data synchronization and server of supporting the multi-protocols link, support the single shortcoming of link protocol to solve existing remote copy system.
The invention provides a kind of server, this server comprises:
The copy operation module is used for initiating small computer system interface (SCSI) order of request metadata, sends this scsi command to initiating (initiator) module; Receive the reading result that described initiator module is returned; And to meta data block transmission call request, receive the metadata that described meta data block is returned, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and backup server;
Described initiation (initiator) module, be used for to be encapsulated as from the described scsi command of described copy operation module and pass to target (target) module that described backup server and this initiator module are used the same link agreement after the link protocol order, receive the reading result that described target module is returned, and send this reading result to described copy operation module; And
Described meta data block is used for the metadata according to the described call request read local of described copy operation module transmission, and returns the described metadata that reads to described copy operation module.
Preferably, described copy operation module specifically is used for: this write request is generated send to described initiator module after writing scsi command, perhaps this read requests is generated and send to described initiator module after reading scsi command;
Described initiator module, specifically be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server; Perhaps receive the described scsi command that reads, this is read scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module is taken out the entrained data of described link protocol order from the bottom disk of described backup server.
Preferably, described copy operation module also is used for: receive the write request that upper layer application sends, the content of said write is written to local disk, and this write request generated send to described initiator module after writing scsi command; Described initiator module, also be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server; And/or
The scsi command of described request metadata and described link protocol order are the orders that the agreement in the SCSI standard expands.
The present invention also provides a kind of server, and this server comprises:
Target (target) module, for receiving the link protocol order of opposite end server with initiation (initiator) the module transmission of this target module use same protocol order, send call request according to this protocol command to meta data block, receive the reading result that described meta data block is returned, and return described reading result to described initiator module;
Described meta data block is used for the metadata according to the described call request read local of described object module transmission, and returns reading result to described target module.
Preferably, described target module also is used for: receive the link protocol order that comprises write request that described initiator module sends, the described entrained data of link protocol order that comprise write request are write the bottom disk of described backup server.
The present invention provides a kind of method of data synchronization of supporting the multi-protocols link in addition, and the method comprises:
Home server is initiated small computer system interface (SCSI) order of request metadata, passes to described backup server after described scsi command is encapsulated as the link protocol order;
Home server is according to the metadata of described scsi command read local and receive the reading result that described backup server returns, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and described backup server.
Preferably, described home server comprises according to the data of this read requests or the synchronous described server of write request and described backup server:
Described home server sends to described backup server after this write request is encapsulated as the link protocol order, so that described backup server writes the entrained data of described link protocol order the bottom disk of described backup server; Send to described backup server after perhaps this read requests being encapsulated as the link protocol order, so that described backup server takes out the entrained data of described link protocol order from the bottom disk of described backup server.
Preferably, the method also comprises: home server is written to local disk according to write request with the content of this write request; Write scsi command according to this write request generation, pass to this backup server after this scsi command is encapsulated as the link protocol order, so that described backup server writes the entrained data of described link protocol order the bottom disk of described backup server; And/or
The scsi command of described request metadata and described link protocol order are the orders that the agreement in the SCSI standard expands.
The present invention provides again a kind of method of data synchronization of supporting the multi-protocols link, and the method comprises:
Backup server receives the link protocol order that comprises request metadata that the opposite end server sends, and comprises the metadata of the link protocol order read local of request metadata according to this;
Described backup server returns reading result to described opposite end server.
Preferably, the method also comprises: described backup server receives the link protocol order that comprises write request that described opposite end server sends, and the described entrained data of link protocol order that comprise write request is write the bottom disk of described backup server.
Method of data synchronization and the server of above-mentioned support multi-protocols link can support to use the multiple link protocol on the multiple network link to create remote copy relationship; And employed link protocol iSCSI, FCP, SRP etc. are the link protocols of industry standard, and the equipment on the network link has sufficient optimization for above-mentioned standard agreement, can obtain preferably network performance.The mode that custom command is added on the basis at the standard scsi command that the present invention uses is very little on the systematic function impact, and is high with the existing equipment compatibility.The target module that the present invention uses also is the basic comprising part of general storage server multi-protocols system, integrates easy with existing storage server system.
Description of drawings
Fig. 1 is the structural representation of server example one of the present invention;
Fig. 2 is the structural representation of server example two of the present invention;
Fig. 3 is the structural representation that the present invention supports the data synchronous system embodiment of multi-protocols link;
Fig. 4 is the signaling process figure of data re-synchronization flow process among the present invention;
Fig. 5 is the signaling process figure of reproduction process among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing embodiments of the invention are elaborated.Need to prove, in the situation that do not conflict, the embodiment among the application and the feature among the embodiment be combination in any mutually.
As shown in Figure 1, be the structural representation of server example one of the present invention, this server comprises copy operation module 11, initiates (initiator) module 12 and meta data block 13, wherein:
The copy operation module is used for initiating small computer system interface (SCSI) order of request metadata, sends this scsi command to initiating (initiator) module; Receive the reading result that described initiator module is returned; And to meta data block transmission call request, receive the metadata that described meta data block is returned, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and backup server;
The initiator module, be used for to be encapsulated as from the described scsi command of described copy operation module and pass to target (target) module that described backup server and this initiator module are used the same link agreement after the link protocol order, receive the reading result that described target module is returned, and send this reading result to described copy operation module;
Meta data block is used for the metadata according to the described call request read local of described copy operation module transmission, and returns the described metadata that reads to described copy operation module.
Wherein, the scsi command of request metadata and link protocol order are new expansions the on the basis of standard scsi command.
In addition, described copy operation module is during according to the data of this read requests or the synchronous described server of write request and backup server, specifically be used for: this write request is generated send to described initiator module after writing scsi command, perhaps this read requests is generated and send to described initiator module after reading scsi command; Described initiator module, specifically be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server; Perhaps receive the described scsi command that reads, this is read scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module is taken out the entrained data of described link protocol order from the bottom disk of described backup server.
Further, this server is when carrying out general copy operation (write request is namely arranged), described copy operation module, also be used for: receive the write request that upper layer application sends, the content of said write is written to local disk, and this write request generated sends to described initiator module after writing scsi command; Described initiator module, also be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server.
As shown in Figure 2, be the structural representation of server example two of the present invention, this server comprises target (target) module 21 and meta data block 22, wherein:
Target (target) module, for receiving the link protocol order of opposite end server with initiation (initiator) the module transmission of this target module use same protocol order, send call request according to this protocol command to meta data block, receive the reading result that described meta data block is returned, and return described reading result to described initiator module;
Described meta data block is used for the metadata according to the described call request read local of described object module transmission, and returns reading result to described target module.
In addition, described target module also is used for: receive the link protocol order that comprises write request that described initiator module sends, the described entrained data of link protocol order that comprise write request are write the bottom disk of described backup server.
Certainly, the present invention also provides a kind of server that is integrated with copy operation module illustrated in figures 1 and 2, meta data block, initiator module and target module, namely this server both can be used as the home server use, can be used as again remote back-up server and used.
The present invention also provides a kind of data synchronous system of supporting the multi-protocols link, this system comprises the home server of structure shown in Figure 1 and the remote back-up server of structure shown in Figure 2, as shown in Figure 3, each link protocol for this system supports all has one group of corresponding initiator module and target module.
The concrete function of each module is as follows:
Copy operation module: be used for receiving read requests and the write request that upper application module is submitted to, operation local disk reading out data and data writing.For write request, generate scsi command according to request, this scsi command is passed to the initiator module, and receive the execution result of initiator module.This module also be used for to initiate the request metadata order and with this command routing to the initiator module, and the execution result of reception initiator module, call the metadata of meta data block comparison home server and backup server, according to comparison result structure read requests and write request.
Meta data block: be used for reading, Preservation Metadata.Preserved the not information such as sync section, data in magnetic disk creation-time of disk in the described metadata.
The initiator module: this module is used for the scsi command that the receiving remote operational module transmits, this scsi command is encapsulated as the order of link protocol, and send this link protocol order to the target module of the same link agreement of backup server by network link, and receive the data that the target module is returned, pass to the copy operation module.
Target module: be used for carrying out scsi command, according to order disk operated or call meta data block Operand data.
The data synchronous system of above-mentioned support multi-protocols link can support to use the multiple link protocol on the multiple network link to create remote copy relationship, and employed link protocol iSCSI, FCP, SRP etc. are the link protocols of industry standard, equipment on the network link has sufficient optimization for above-mentioned standard agreement, can obtain preferably network performance.
The mode that custom command is added on the basis at the standard scsi command that the present invention uses is very little on the systematic function impact, and is high with the existing equipment compatibility.The target module that the present invention uses also is the basic comprising part of general storage server multi-protocols system, integrates easy with existing storage server system.
In addition, the present invention also provides a kind of method of data synchronization of supporting the multi-protocols link, and the method is described from the angle of home server, and the method comprises:
Step 101, home server are initiated small computer system interface (SCSI) order of request metadata, pass to described backup server after described scsi command is encapsulated as the link protocol order;
Step 102, home server are according to the metadata of described scsi command read local and receive the reading result that described backup server returns, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and described backup server.
The present invention also provides a kind of method of data synchronization of supporting the multi-protocols link, and the method is described from the angle of backup server, and the method comprises:
Step 201, backup server receive the link protocol order that comprises request metadata that the opposite end server sends, and comprise the metadata of the link protocol order read local of request metadata according to this;
Step 202, described backup server return reading result to described opposite end server.
The opposite end server of mentioning among this embodiment namely is the home server among Fig. 3, and backup server is the remote back-up server among Fig. 3.
The below is described in detail technical scheme of the present invention from home server and the mutual angle of backup server based on Fig. 3:
Embodiment one
Re-start synchrodata at home server and backup server, as shown in Figure 4, this process comprises:
Step 301, on home server, the copy operation module is initiated the request metadata scsi command, and passes to initiator module corresponding to link protocol that the user uses;
Step 302, on home server, the initiator module is encapsulated as corresponding link protocol order with above-mentioned scsi command, sends to the target module of backup server;
Step 303, on backup server, the target module receives above-mentioned link protocol order, calls meta data block and reads metadata, and send metadata to the initiator module of home server;
Step 304, on home server, the above-mentioned metadata that the transmission of initiator module receives is to the copy operation module;
Step 305, on home server, the copy operation module is called meta data block and is read metadata, compares with the metadata of backup server, determines the new and old of data on home server and the backup server;
Step 306, on home server, copy operation module structure write request or read requests, the synchronously data of home server and backup server.
Embodiment two
As shown in Figure 5, home server and backup server comprise the steps: when carrying out general copy operation
Step 401, on home server, after the copy operation module receives the write request of upper layer application, the content of write request is written to local disk, and generates scsi command according to write request, with initiator module corresponding to link protocol of this command routing to user's use;
Step 402, on home server, the initiator module is encapsulated as corresponding link protocol order with above-mentioned scsi command, sends to the target module of backup server;
Step 403, on backup server, the target module receives above-mentioned link protocol order, and will order contained data to be written in the bottom disk, what send the link protocol regulation is written to function signal to the initiator module of home server;
Step 404, on home server, the initiator module is written to function signal with the link protocol that receives and is converted to SCSI and is written to function signal, and this SCSI is written to function signal passes to the copy operation module.
The mode that custom command is added on the basis at the standard scsi command of using in above-described embodiment is very little on the systematic function impact, and is high with the existing equipment compatibility.
One of ordinary skill in the art will appreciate that all or part of step in the said method can come the instruction related hardware to finish by program, said procedure can be stored in the computer-readable recording medium, such as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a server is characterized in that, this server comprises:
The copy operation module is used for initiating small computer system interface (SCSI) order of request metadata, sends this scsi command to initiating (initiator) module; Receive the reading result that described initiator module is returned; And to meta data block transmission call request, receive the metadata that described meta data block is returned, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and backup server;
Described initiation (initiator) module, be used for to be encapsulated as from the described scsi command of described copy operation module and pass to target (target) module that described backup server and this initiator module are used the same link agreement after the link protocol order, receive the reading result that described target module is returned, and send this reading result to described copy operation module; And
Described meta data block is used for the metadata according to the described call request read local of described copy operation module transmission, and returns the described metadata that reads to described copy operation module.
2. server according to claim 1 is characterized in that:
Described copy operation module specifically is used for: this write request is generated send to described initiator module after writing scsi command, perhaps this read requests is generated and send to described initiator module after reading scsi command;
Described initiator module, specifically be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server; Perhaps receive the described scsi command that reads, this is read scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module is taken out the entrained data of described link protocol order from the bottom disk of described backup server.
3. server according to claim 1 and 2 is characterized in that:
Described copy operation module also is used for: receive the write request that upper layer application sends, the content of said write is written to local disk, and this write request generated send to described initiator module after writing scsi command; Described initiator module, also be used for: receive the said write scsi command, this is write scsi command be encapsulated as and send to the target module of using the same link agreement in the described backup server after the link protocol order, so that described target module writes the entrained data of described link protocol order the bottom disk of described backup server; And/or
The scsi command of described request metadata and described link protocol order are the orders that the agreement in the SCSI standard expands.
4. a server is characterized in that, this server comprises:
Target (target) module, for receiving the link protocol order of opposite end server with initiation (initiator) the module transmission of this target module use same protocol order, send call request according to this protocol command to meta data block, receive the reading result that described meta data block is returned, and return described reading result to described initiator module;
Described meta data block is used for the metadata according to the described call request read local of described object module transmission, and returns reading result to described target module.
5. server according to claim 4 is characterized in that:
Described target module also is used for: receive the link protocol order that comprises write request that described initiator module sends, the described entrained data of link protocol order that comprise write request are write the bottom disk of described backup server.
6. a method of data synchronization of supporting the multi-protocols link is characterized in that, the method comprises:
Home server is initiated small computer system interface (SCSI) order of request metadata, passes to described backup server after described scsi command is encapsulated as the link protocol order;
Home server is according to the metadata of described scsi command read local and receive the reading result that described backup server returns, described reading result and described metadata are compared, according to comparison result structure read requests or write request, according to the data of this read requests or the synchronous described server of write request and described backup server.
7. method according to claim 6 is characterized in that:
Described home server comprises according to the data of this read requests or the synchronous described server of write request and described backup server:
Described home server sends to described backup server after this write request is encapsulated as the link protocol order, so that described backup server writes the entrained data of described link protocol order the bottom disk of described backup server; Send to described backup server after perhaps this read requests being encapsulated as the link protocol order, so that described backup server takes out the entrained data of described link protocol order from the bottom disk of described backup server.
8. it is characterized in that according to claim 6 or 7 described methods:
The method also comprises: home server is written to local disk according to write request with the content of this write request; Write scsi command according to this write request generation, pass to this backup server after this scsi command is encapsulated as the link protocol order, so that described backup server writes the entrained data of described link protocol order the bottom disk of described backup server; And/or
The scsi command of described request metadata and described link protocol order are the orders that the agreement in the SCSI standard expands.
9. a method of data synchronization of supporting the multi-protocols link is characterized in that, the method comprises:
Backup server receives the link protocol order that comprises request metadata that the opposite end server sends, and comprises the metadata of the link protocol order read local of request metadata according to this;
Described backup server returns reading result to described opposite end server.
10. method according to claim 9 is characterized in that, the method also comprises:
Described backup server receives the link protocol order that comprises write request that described opposite end server sends, and the described entrained data of link protocol order that comprise write request is write the bottom disk of described backup server.
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Application publication date: 20130327 |