CN104461776A - Application disaster tolerance method based on CDP and iSCSI virtual disk technology - Google Patents
Application disaster tolerance method based on CDP and iSCSI virtual disk technology Download PDFInfo
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Abstract
The invention relates to an application disaster tolerance method based on the CDP and the iSCSI virtual disk technology. The application disaster tolerance method based on the CDP and the iSCSI virtual disk technology comprises the steps that firstly, CDP data blocks are stored in an OFS storage medium and an NFS storage medium respectively; secondly, after service roll data are damaged, data in the NFS storage medium are organized into a mounting roll according to the iSCSI virtual disk technology to be mounted on a host computer to serve as a temporary service roll to be used by a host computer service system, new service data are saved in the OFS storage medium, and data recovery is conducted on the original service roll by means of data in the OFS storage medium; after data recovery of the original service roll is completed, the service system is stopped in a service idle time, the new data are recovered to the original service roll, and the service system is switched back to the original service roll. Compared with the prior art, the application disaster tolerance method based on the CDP and the iSCSI virtual disk technology has the advantages that reservation of the new data is achieved when the mounting roll serves as the temporary service roll, and data recovery of the original service roll is achieved under the condition that service interruption is not needed.
Description
Technical field
The present invention relates to computer information storage technology field, especially relate to a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology.
Background technology
Along with the Exponential growth of information age data capacity and speed, the value of data highlights undoubtedly, and enterprise drops into huge cost and protects data and key service system.But due to various subjectivity or objectively reason cause corrupted data, the situation that operation system is interrupted happens occasionally, and this brings loss greatly and inconvenience to enterprise, and data protection is just becoming abnormal important and urgent.
It is unpractical that eternal guarantee operation system does not go wrong, how after the system failure causes service disconnection, to return to rapidly available state, ensure that operation system is recovered fast, reliably? CDP (Continuous Data Protection) technology is current popular, and a kind of real time data protection scheme that RTO and RPO is higher, its backup principle is as follows: 1) at initial phase, generate a complete data copy by block level duplication technology; 2) in incremental stages, catch I/O data block in real time by CDP module and generate incremental data copy.
How to store the data that CDP produces, abundant consistance time point (copy) available recovery can be ensured, the service disconnection of very short time in rejuvenation can be ensured again? it is a current difficult problem.If simple using object-based file system as CDP data storage medium, although the data of unlimited multiple time point can be retained, there is provided abundant time point for disaster recovery, but along with the prolongation of timeline, the increase of data volume and the complicacy of retrieves data blocks, rejuvenation will continue several hours even several days, if selected using native file system as on CDP data storage medium, CDP data are written in the volume image file that native file system creates in real time, and regularly snapshot is done to the volume at image file place, when occurring that corrupted data causes operation system fault, directly by iSCSI (Intemet Small Computer System Interface) virtual disk technology image file hung up and be supplied to operation system use, although this method can shorten RTO greatly, but also there is following problem in it: first, be wrapping with out and supply operation system Interim use, does period increase data newly and how to retain? secondly, how quick row date restoring is involved in former business? again, how to solve the conforming problem of application data?
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology is provided; solve the reservation problem increasing data when carry volume serves as occasional service volume newly; and to the data restore that former business is rolled up when achieving non-interrupting service; only need extremely short servicing down times, just operation system switchback can be returned.
Object of the present invention can be achieved through the following technical solutions:
Based on an application disaster recovery method for CDP and iSCSI virtual disk technology, it is characterized in that, the method utilizes CDP technology and iSCSI virtual disk technology;
First CDP data block is stored in respectively OFS (Object File System) storage medium and NFS (Native File System) storage medium;
Secondly, when after business volume corrupted data, first the data in NFS storage medium are organized into be wrapping with to be downloaded on main frame by iSCSI virtual disk technology and roll up as occasional service, for host service system, and Added Business data are saved in OFS storage medium, meanwhile, by the data in OFS storage medium, date restoring is done to former business volume;
After former business volume date restoring completes, select the time of a business free time, stop operation system, complete newly-increased date restoring and roll up to former business, by former for operation system switchback business volume.
The method specifically comprises the following steps:
1) transmit: by network, the source volume data Bulk transport after initialization is held to Console;
2) store initialization data: the medium management module of being held by Console by initialization data block synchronization distribution to OFS read write line and NFS read write line, initialization data block, according to predefined initialization data block processing policy, is write OFS storage medium and NFS storage medium by described OFS read write line and NFS read write line respectively;
3) incremental data is obtained.: according to predefined incremental data transmission policy, CDP incremental data Bulk transport is held to Console;
4) store incremental data: the medium management module of being held by Console by incremental data block synchronization distribution to OFS read write line and NFS read write line, incremental data block, according to predefined incremental data block processing policy, is write OFS storage medium and NFS storage medium by described OFS read write line and NFS read write line respectively;
5) carry recovers: when subscriber service system because reel corrupted data causes having no progeny in operation system, by iSCSI virtual disk technology by the respective file carry that is stored on NFS medium out, interim for subscriber service system, bitmap table is created, for marking region of variation in internal memory; NFS medium creates temporary file, for storing newly-increased data; OFS medium creates a time point object, for backing up newly-increased data;
6) response service system write request that iSCSI is rolled up: synchronously by the temporary file that creates in newly-increased data write step 5, and updated space chart corresponding region, the asynchronous OFS time point object that newly-increased data write step 5 is created;
7) the response service system read request of rolling up iSCSI: search bitmap table according to metadata, in the corresponding region read block of original or temporary file, returns to iSCSI Initaitor.
Described store initialization data, comprise following sub-step:
21) medium management module receives initialization data block;
22) medium management module by initialization data block synchronization distribution to OFS read write line and NFS read write line;
23) data block is write the corresponding region of initialization time point object by OFS read write line according to data block summary info;
24) data block writes with the file corresponding region of reel name according to data block summary info by NFS read write line.
Described storage incremental data, comprises following sub-step:
31) medium management module receives incremental data block;
32) medium management module by incremental data block synchronization distribution to OFS read write line and NFS read write line;
33) OFS read write line carrys out process data block according to data block attribute and summary info, if time point object, then and newly-increased time point object on OFS medium; If data object, then according to summary info, data are write the corresponding region of current point in time object;
34) after NFS read write line receives incremental data block, different according to data block attribute, do different disposal: if data object, then by data buffer storage to local cache district; If data object, then by the data write volume object file in buffer memory.
Described local cache district, refers to and rolls up by internal memory and NFS the size configurable self-defining data block scratchpad area (SPA) formed.Time point be ensure subscriber service system data consistent can minimum unit, when receiving next time point object, show that the data of a time point are complete, for tackling the abnormal conditions of operation system, NFS storage medium because only have a copy, therefore writes data with a complete time point for minimum unit;
The write request that described response service system is rolled up iSCSI, comprises following sub-step:
41) metadata and data message that iSCSI agreement obtains write request is resolved;
42) navigate to the corresponding region of temporary file according to metadata information, data are write this region;
43) updated space chart;
44) send the data to OFS read write line, notice OFS read write line is by Data writing time point object;
45) return messages are to iSCSI Initaitor.
Described temporary file, roll up for storing iSCSI temporarily the newly-increased data be supplied between the subscriber service system operating period, why directly do not write original corresponding to iSCSI virtual volume, be in Interim use process operation system again fault to NFS store in backup set produce destroy;
Described bitmap, be leave in for recording the linear data structure of change one of LUN in internal memory, whether a bit position is modified for identifying corresponding LUN.
Described LUN (logic unit), refers to the entity in scsi target device with independent execution I/O order.For an a physics scsi device normally LUN, multiple LUN is then comprised for disk array controller.
The read request that described response service system is rolled up iSCSI, comprises following sub-step:
51) metadata and buffer memory Buffer information that iSCSI agreement obtains read request is resolved;
52) bitmap table is searched according to metadata;
53) according to lookup result determination request msg memory location;
54) read data and put into buffer memory Buffer;
55) return messages are to iSCSI Initaitor.
The present invention also achieves the consistance proxy module for different application on production main frame, solves the conforming problem of application data.
Compared with prior art, the present invention is in conjunction with the relative merits of native file system and object-based file system, by CDP data redundancy is stored on two media, after disaster occurs, based on the data that native file system NFS medium stores, by iSCSI virtual disk technology, realize the momentary recovery of subscriber service system, browse recovery based on the consistance time point of object-based file system OFS medium simultaneously, the data of the former business volume of user are repaired, promote the redundancy ability of subscriber service system, after disaster occurs, within the extremely short time, fast quick-recovery operation system, and provide continual data protection to operation system.
Accompanying drawing explanation
Fig. 1 is ICP/IP protocol 4 layer model schematic diagram;
Fig. 2 is CDP disaster tolerance system structural drawing of the present invention;
Fig. 3 data backup workflow diagram of the present invention;
Fig. 4 disaster recovery workflow diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
With reference to the accompanying drawings the implementation procedure of a kind of application disaster recovery method based on CDP technology and iSCSI virtual disk technology of the present invention is set forth.
Former standby system is made up of client and control desk, is connected between the two by Ethernet, and the host-host protocol of employing is TCP/IP.ICP/IP protocol 4 layer model as shown in Figure 1.In order to realize the application disaster recovery method based on CDP technology and iSCSI virtual disk technology within the system, only need add consistance proxy module in former client, and provide consistance collaboration feature in CDP module, server end adds NFS manager module.The structural drawing of whole system as shown in Figure 2.
Data backup workflow schematic diagram as indicated at 3, is specially:
1. enumerate prison path and duplicate removal, filter out the set of unique monitoring volume, notice bottom layer driving starts to catch monitoring volume I/O change;
2. according to monitoring volume file system bitmap table read block from the reference position of volume, if read the end position of volume, represent current volume initialization complete, from monitoring queue, obtain next volume, if volume queue to be initiated be sky, go to step 2; Otherwise, go to step 5;
3. send initialization data block, go to step 4;
4. synchronously by initialization data block write NFS medium and OFS medium;
5. obtain incremental data block, be transferred to the medium management module of Console end by data channel;
6. store incremental data block: OFS read write line carrys out process data block according to data block attribute and summary info, if time point object, then newly-increased time point object on OFS medium; If data object, then according to summary info, data are write the corresponding region of current point in time object; After NFS read write line receives incremental data block, different according to data block attribute, do different disposal: if data object, then by data buffer storage to local cache district; If data object, then by the data write volume object file in buffer memory;
7. continue to obtain next increment data block, go to step 5;
8. stop task: task normally stops, and CDP module and consistance proxy collaboration carry out the data consistency process of time point, exiting after needing to wait until the data in NFS manager synchronization caching; The abnormal end of task, last incomplete time point in OFS medium deleted by OFS manager, and NFS manager needs the data emptied in buffer memory;
9. task terminates.
Carry resumes work schematic flow sheet as indicated at 4, is specially:
1. user manually initiates disaster-containing pipe by control desk;
2.iSCSI module by file organization rolling corresponding in NFS medium, is mounted to client by iSCSI virtual disk technology, and carry success, goes to step 3, otherwise, go to step;
3. create temporary file, and send message informing OFS manager establishment disaster tolerance time point, go to step 4;
4.iSCSI Target receives iSCSI initiator and asks, and resolves iSCSI agreement request, if read request, goes to step 5; If write request, go to step 6;
5. customer in response end read request that iSCSI is rolled up: resolve metadata and buffer memory Buffer information that iSCSI agreement obtains read request; Bitmap table is searched according to metadata; According to lookup result determination request msg memory location, if all request msgs are all stored in original, then read from original corresponding region; If all request msgs are all stored in temporary file, then read from original corresponding region; If request msg part is stored in original, part is stored in temporary file, then first read from original, then reads from temporary file, returns after data assemblies;
6. customer in response end write request that iSCSI is rolled up; Navigate to the corresponding region of temporary file according to metadata information, data are write this region; Updated space chart; Send the data to OFS read write line, notice OFS read write line is by Data writing time point object;
7. continue to monitor iSCSI agreement request, go to step 4;
8. stop task: task normally stops, and iSCSI module and consistance proxy collaboration carry out the data consistency process of disaster tolerance time point, exiting front NFS manager needs release bitmap table memory source and deletes temporary file, and OFS retains disaster tolerance time point; The abnormal end of task, disaster tolerance time point deleted by OFS manager, and NFS manager needs release bitmap table memory source and deletes temporary file;
9. task terminates.
Embodiment is illustrated:
The present invention mainly by CDP data block after consistency treatment, be stored in the OFS storage medium based on object-based file system and the NFS storage medium based on native file system, after causing operation system abnormal due to business volume fault, by iSCSI virtual disk technology, the data in NFS medium are hung into occasional service volume, for operation system, realize the momentary recovery of operation system; Simultaneously; OFS creates disaster tolerance time point; row data protection is involved in occasional service; and on OFS medium, find the corresponding time point of the NFS media data hung up, row date restoring is involved in former business, after this point-in-time recovery completes; select according to user; after the unloading of occasional service volume, disaster tolerance time point date restoring is rolled up to former business, realizes operation system switchback.Specific embodiment of the invention process is as follows:
Precondition: install backup client at subscriber service system place main frame, this client mainly comprises application consistance proxy module, CDP module, iSCSI Initiator module, data transmission module, control module.Need to provide a main frame, this main frame is installed backup server end, this server end mainly comprises iSCSI Target module, OFS medium management module and NFS medium management module.
1. the newly-built real-time task CDPJob1 based on the SQL Server database on AppServer1 on application server of hypothesis, according to the data source that SQL consistance module provides, after CDP module screening duplicate removal, the supervised path obtained is the E dish on AppServer1;
2. backup services performs CDPJob1, CDP module carries out initial work to E dish, data are delivered to backup server end by data transmission module, OFS medium management module creation initialization time point Tp0, by under initialization data block write Tp0 object, NFS medium first creates catalogue corresponding to CDPJob1, then creates Object_E file under catalogue, by initialization data block write Object_E; This process, bottom disk filter drives and opens monitoring, and disk delta data is recorded in log buffer file with format.
3. initialization completes, and enter the incremental replication stage, CDP module extracts incremental data from log buffer, by transport module, sends incremental data to backup server end.This process, CDP module can produce frequency parameter according to the time point of CDPJob1, calls the interface that application consistance module provides, has driven the consistency treatment to current point in time with bottom disk filter.
4.OFS media manager produces a series of time point Tp1, Tp2 according to consistency treatment strategy ... TpN, directly the incremental data of correspondence is kept to time point catalogue under; Unlike this, because only have a copy inside NFS, incremental data block can not write direct, and incremental data block cache first gets up by NFS media manager, by the time the complete incremental data receiving a consistency treatment cycle, by the data write Object_E file in buffer memory.
5. suppose n-hour, operation system there occurs fault, CDPJob1 is abnormal, the control module of client sends message to backup server end, backup server end forwards abnormal to OFS media manager and NFS value control device, OFS media manager deletes TpN time point object and ancillary data block thereof, and NFS media manager first checks whether that all complete consistance cycle datas have all been synchronized to Object_E file, is then deleting the data in buffer memory.Then CDPJob1 stops.
6. user initiates carry recovery tasks RecoverJob1, by iSCSI virtual disk technology, Object_E is mounted to AppServer1, system distributes label F automatically, user's manual modification application path, restart application service, F volume starts to replace former business volume E as occasional service volume.Meanwhile, NFS media manager can notify that OFS media manager creates disaster tolerance time point RTP0, and resolve iSCSI agreement write data block request, newly-increased data are issued OFS media manager and are kept at RTP0.
7. meanwhile, if user have selected repair former business volume E, backup manager will initiate recovery tasks RecoverJob2, select Tp (N-1) time point in OFS medium, recover to repair the data on E volume by browsing.After RecoverJob2 completes, user can be notified, select evening or business not busy time at midnight, stop operation system, stop RecoverJob1, the date restoring of time point RTP0 is rolled up to E, after RTP0 runs succeeded, amendment application path, transfers business volume to E, in recovery operation system, start CDPJob1.So far, operation system completes recovery from fault.
Claims (8)
1. based on an application disaster recovery method for CDP and iSCSI virtual disk technology, it is characterized in that, the method utilizes CDP technology and iSCSI virtual disk technology;
First CDP data block is stored in OFS storage medium and NFS storage medium respectively;
Secondly, when after business volume corrupted data, first the data in NFS storage medium are organized into be wrapping with to be downloaded on main frame by iSCSI virtual disk technology and roll up as occasional service, for host service system, and Added Business data are saved in OFS storage medium, meanwhile, by the data in OFS storage medium, date restoring is done to former business volume;
After former business volume date restoring completes, select the time of a business free time, stop operation system, complete newly-increased date restoring and roll up to former business, by former for operation system switchback business volume.
2. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 1, it is characterized in that, the method specifically comprises the following steps:
1) transmit: by network, the source volume data Bulk transport after initialization is held to Console;
2) store initialization data: the medium management module of being held by Console by initialization data block synchronization distribution to OFS read write line and NFS read write line, initialization data block, according to predefined initialization data block processing policy, is write OFS storage medium and NFS storage medium by described OFS read write line and NFS read write line respectively;
3) incremental data is obtained.: according to predefined incremental data transmission policy, CDP incremental data Bulk transport is held to Console;
4) store incremental data: the medium management module of being held by Console by incremental data block synchronization distribution to OFS read write line and NFS read write line, incremental data block, according to predefined incremental data block processing policy, is write OFS storage medium and NFS storage medium by described OFS read write line and NFS read write line respectively;
5) carry recovers: when subscriber service system because reel corrupted data causes having no progeny in operation system, by iSCSI virtual disk technology by the respective file carry that is stored on NFS medium out, interim for subscriber service system, bitmap table is created, for marking region of variation in internal memory; NFS medium creates temporary file, for storing newly-increased data; OFS medium creates a time point object, for backing up newly-increased data;
6) response service system write request that iSCSI is rolled up: synchronously by the temporary file that creates in newly-increased data write step 5, and updated space chart corresponding region, the asynchronous OFS time point object that newly-increased data write step 5 is created;
7) the response service system read request of rolling up iSCSI: search bitmap table according to metadata, in the corresponding region read block of original or temporary file, returns to iSCSI Initaitor.
3. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, it is characterized in that, described store initialization data, comprise following sub-step:
21) medium management module receives initialization data block;
22) medium management module by initialization data block synchronization distribution to OFS read write line and NFS read write line;
23) data block is write the corresponding region of initialization time point object by OFS read write line according to data block summary info;
24) data block writes with the file corresponding region of reel name according to data block summary info by NFS read write line.
4. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, it is characterized in that, described storage incremental data, comprises following sub-step:
31) medium management module receives incremental data block;
32) medium management module by incremental data block synchronization distribution to OFS read write line and NFS read write line;
33) OFS read write line carrys out process data block according to data block attribute and summary info, if time point object, then and newly-increased time point object on OFS medium; If data object, then according to summary info, data are write the corresponding region of current point in time object;
34) after NFS read write line receives incremental data block, different according to data block attribute, do different disposal: if data object, then by data buffer storage to local cache district; If data object, then by the data write volume object file in buffer memory.
5. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 4, is characterized in that, described local cache district, refers to and rolls up by internal memory and NFS the size configurable self-defining data block scratchpad area (SPA) formed.
6. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, is characterized in that the write request that described response service system is rolled up iSCSI comprises following sub-step:
41) metadata and data message that iSCSI agreement obtains write request is resolved;
42) navigate to the corresponding region of temporary file according to metadata information, data are write this region;
43) updated space chart;
44) send the data to OFS read write line, notice OFS read write line is by Data writing time point object;
45) return messages are to iSCSI Initaitor.
7. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 6, is characterized in that, described temporary file, is to roll up for storing iSCSI temporarily the newly-increased data be supplied between the subscriber service system operating period.
8. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, is characterized in that the read request that described response service system is rolled up iSCSI comprises following sub-step:
51) metadata and buffer memory Buffer information that iSCSI agreement obtains read request is resolved;
52) bitmap table is searched according to metadata;
53) according to lookup result determination request msg memory location;
54) read data and put into buffer memory Buffer;
55) return messages are to iSCSI Initaitor.
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