CN104461776B - Disaster recovery method is applied based on CDP and iSCSI virtual disk technology - Google Patents
Disaster recovery method is applied based on CDP and iSCSI virtual disk technology Download PDFInfo
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Abstract
The present invention relates to a kind of to apply disaster recovery method based on CDP and iSCSI virtual disk technology, and CDP data block is respectively stored in OFS storage medium and NFS storage medium first；Secondly, after business rolls up corrupted data, first the data in NFS storage medium are organized into be wrapping with to be downloaded on host by iSCSI virtual disk technology and are rolled up as occasional service, it is used for host service system, and Added Business data are saved in OFS storage medium, meanwhile data recovery is done to former business volume with the data in OFS storage medium；After the completion of former business volume data are restored, the time of a business free time is selected, operation system is stopped, being completed newly-increased data and be restored to former business volume, operation system switchback original business is rolled up.Compared with prior art, the present invention has many advantages, such as solve the problems, such as the reservation of newly-increased data when carry volume serves as occasional service volume, and repairs in the case where realizing non-interrupting service to the data of former business volume.
Description
Technical field
The present invention relates to computer information storage technology fields, are based on CDP and iSCSI virtual disk more particularly, to one kind
Technology applies disaster recovery method.
Background technique
With the Exponential growth of information age data capacity and speed, the value of data is highlighted undoubtedly, and enterprise's investment is huge
Big cost protects data and key service system.But data are caused to be damaged due to various subjective or objective
Bad, the case where operation system is interrupted, happens occasionally, this brings greatly loss and inconvenient to enterprise, and data protection is just becoming different
Normal is important and urgent.
Forever guarantee operation system do not go wrong be it is unpractical, how after the system failure leads to service disconnection rapidly it is extensive
Available state is arrived again, guarantees that operation system quickly, is reliably restored？CDP (Continuous Data Protection) skill
Art is current popular, and all higher a kind of real time data protection scheme of RTO and RPO, backup principle are as follows：1) first
Stage beginning generates a complete data copy by block grade duplication technology；2) it in incremental stages, is caught in real time by CDP module
It obtains I/O data block and generates incremental data copy.
The data for how storing CDP generation, both can guarantee that enough consistency time points (copy) were available extensive
It is multiple, and can guarantee the service disconnection of very short time in recovery process？It is a current problem.If merely with obj ect file system
System is used as CDP data storage medium, although can retain the data at unlimited number of time point, providing enough time points is used for
Disaster recovery, but with the extension of timeline, the increase of data volume and the complexity for retrieving data block, recovery process will continue several
Hour even several days；If selected on using native file system as CDP data storage medium, CDP data are written in real time
The volume image file created on native file system, and snapshot periodically is done to the volume where image file, when there is corrupted data
It is directly empty by iSCSI (Internet Small Computer System Interface) when leading to operation system failure
Quasi- magnetic disc hangs up image file to be supplied to operation system and use, although this method can greatly shorten RTO,
There is also following problems for it：First, it is wrapping with out and temporarily be used for operation system, during which increase how data retain newly？Its
It is secondary, how quickly to former business involve in row data restore？Again, how to solve the problems, such as using data consistency？
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind based on CDP and
ISCSI virtual disk technology applies disaster recovery method, and the reservation for solving newly-increased data when carry volume serves as occasional service volume is asked
Topic, and the data reparation that former business is rolled up in the case where realizing non-interrupting service, it is only necessary to extremely short maintenance downtime, just
Operation system switchback can be returned.
The purpose of the present invention can be achieved through the following technical solutions：
It is a kind of that disaster recovery method is applied based on CDP and iSCSI virtual disk technology, which is characterized in that this method utilizes CDP
Technology and iSCSI virtual disk technology；
CDP data block is respectively stored in OFS (Object File System) storage medium and NFS (Native first
File System) storage medium；
Secondly, the data in NFS storage medium are first passed through iSCSI virtual disk technology after business rolls up corrupted data
It is organized into be wrapping with to be downloaded on host and be rolled up as occasional service, used for host service system, and Added Business data are saved in
OFS storage medium, meanwhile, data recovery is done to former business volume with the data in OFS storage medium；
After the completion of former business volume data are restored, the time of a business free time is selected, operation system is stopped, being completed newly-increased
Data are restored to former business volume, and operation system switchback original business is rolled up.
This method specifically includes following steps：
1) it transmits：The source volume data block after initialization is transferred to the end Console by network；
2) storing initial data：By the medium management module at the end Console by initialization data block synchronization distribution to OFS
Reader and NFS reader, the OFS reader and NFS reader according to predefined initialization data block processing strategie,
Initialization data block is respectively written into OFS storage medium and NFS storage medium；
3) incremental data is obtained：Strategy is transmitted according to predefined incremental data, CDP incremental data block is transferred to
The end Console；
4) incremental data is stored：Incremental data block synchronization distribution is read and write to OFS by the medium management module at the end Console
Device and NFS reader, the OFS reader and NFS reader are according to predefined incremental data block processing strategie, by increment
Data block is respectively written into OFS storage medium and NFS storage medium；
5) carry restores：After subscriber service system causes operation system to be interrupted due to reel corrupted data, pass through iSCSI
Virtual disk technology comes out the respective file carry being stored on NFS medium, temporarily uses for subscriber service system, in memory
Middle creation bitmap table, for marking region of variation；Temporary file is created on NFS medium, for storing newly-increased data；In OFS
A time point object is created on medium, for backing up newly-increased data；
6) operation system is responded to iSCSI volumes of write request：The synchronous interim text that will be created in newly-increased data write step 5
In part, and bitmap table corresponding region is updated, the asynchronous OFS time point object for creating newly-increased data write step 5；
7) operation system is responded to iSCSI volumes of read request：According to metadata lookup bitmap table, in original or interim text
The corresponding region read block of part, returns to iSCSI Initaitor.
The storing initial data, including following sub-step：
21) medium management module receives initialization data block；
22) medium management module is by initialization data block synchronization distribution to OFS reader and NFS reader；
23) corresponding region of initialization time point object is written according to data block summary info by OFS reader for data block；
24) the file corresponding region named with reel is written according to data block summary info by NFS reader for data block.
The storage incremental data, including following sub-step：
31) medium management module receives incremental data block；
32) medium management module is by incremental data block synchronization distribution to OFS reader and NFS reader；
33) OFS reader handles data block according to data block's attribute and summary info, if time point object, then exists
Increase time point object on OFS medium newly；If data object, then current time point object is write data into according to summary info
Corresponding region；
34) different according to data block's attribute after NFS reader receives incremental data block, do different disposal：If increment
Data object, then by data buffer storage to local cache area；If data object, then by the data write-in volume object text in caching
Part.
The local cache area refers to that the self-defining data block that can configure by the size that memory and NFS volumes form is interim
Memory block.One time point is to guarantee the consistent available minimum unit of subscriber service system data, when receiving next time point
When object, showed that the data at a upper time point were complete, for cope with operation system abnormal conditions, NFS storage medium because
There was only copy, therefore data are write using a complete time point as minimum unit；
The response operation system is to iSCSI volumes of write request, including following sub-step：
41) parsing iSCSI protocol obtains the metadata and data information of write request；
42) corresponding region that temporary file is navigated to according to metadata information, writes data into the region；
43) bitmap table is updated；
44) OFS reader is sent the data to, notice OFS reader writes data into time point object；
45) iSCSI Initaitor is returned message to.
The temporary file, be for temporarily store iSCSI volumes be supplied to it is newly-increased during subscriber service system use
Why data are not written directly to the corresponding original of iSCSI virtual volume, are in order to avoid operation system in interim use process
Failure generates destruction to the backup set in NFS storage again；
The bitmap is to store a linear data structure for being used to record variation LUN in memory, one bit
For identifying whether corresponding LUN more corrects one's mistakes.
The LUN (logic unit), refer to has the entity for independently executing I/O order in scsi target device.It is right
It is usually a LUN for a physics scsi device, then includes multiple LUN for disk array controller.
The response operation system is to iSCSI volumes of read request, including following sub-step：
51) parsing iSCSI protocol obtains the metadata and caching Buffer information of read request；
52) according to metadata lookup bitmap table；
53) request data storage location is determined according to lookup result；
54) data are read and are put into caching Buffer；
55) iSCSI Initaitor is returned message to.
The present invention also realizes the consistency proxy module for different application on production host, solves using data
The problem of consistency.
Compared with prior art, the advantage and disadvantage of present invention combination native file system and object-based file system, by by CDP
Data redundancy is stored on two media, after disaster generation, based on the data stored on native file system NFS medium, is led to
ISCSI virtual disk technology is crossed, realizes the momentary recovery of subscriber service system, while based on object-based file system OFS medium
Consistency time point browsing is restored, and repairs to the data of user's original business volume, promotes the redundancy ability of subscriber service system,
After disaster occurs, in a very short period of time, fast quick-recovery operation system, and provide continual data to operation system and protect
Shield.
Detailed description of the invention
Fig. 1 is 4 layer model schematic diagram of ICP/IP protocol；
Fig. 2 is CDP disaster tolerance system structure chart of the present invention；
Fig. 3 data backup work flow diagram of the present invention；
Fig. 4 disaster recovery work flow diagram of the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
With reference to the accompanying drawings to a kind of application disaster tolerance side based on CDP technology and iSCSI virtual disk technology of the invention
The realization process of method is illustrated.
Former standby system is made of client and console, is connected between the two by Ethernet, the transport protocol of use
It is TCP/IP.4 layer model of ICP/IP protocol is as shown in Figure 1.It is virtual based on CDP technology and iSCSI in order to realize within the system
Magnetic disc applies disaster recovery method, consistency proxy module need to only be added in former client, and provide unanimously in CDP module
Property collaboration feature, server end increase NFS manager module.The structure chart of whole system is as shown in Figure 2.
Data backup workflow schematic diagram as indicated at 3, specially：
1. enumerating prison path and duplicate removal, unique monitoring volume set is filtered out, notice bottom layer driving starts capture monitoring volume I/O
Variation；
2. file system bitmap table read block since the initial position of volume is rolled up according to monitoring, if reading the end of volume
Position indicates that current volume has initialized completion, obtains next volume from monitoring queue, if volume queue to be initiated is not sky,
Go to step 2；Otherwise, 5 are gone to step；
3. sending initialization data block, 4 are gone to step；
4. synchronous be written NFS medium and OFS medium for initialization data block；
5. obtaining incremental data block, the medium management module at the end Console is transferred to by data channel；
6. storing incremental data block：OFS reader handles data block according to data block's attribute and summary info, if when
Between point object, then on OFS medium increase newly time point object；If data object, is then write data into and worked as according to summary info
The corresponding region of preceding time point object；It is different according to data block's attribute after NFS reader receives incremental data block, do difference
Processing：If incremental data object, then by data buffer storage to local cache area；If data object, then by the data in caching
Volume object file is written；
7. continuing to obtain next increment data block, 5 are gone to step；
8. stopping task：Task normally stops, the data consistency of CDP module and consistency proxy collaboration progress time point
Processing needs exiting after the data in NFS manager synchronization caching；The abnormal end of task, OFS manager delete OFS
The incomplete time point of the last one in medium, NFS manager need empty the cache in data；
9. task terminates.
Carry resumes work flow diagram as indicated at 4, specially：
1. user initiates disaster-containing pipe by console manually；
2.iSCSI module is coiled by file organization corresponding in NFS medium by iSCSI virtual disk technology, is mounted to
Client, carry success, goes to step 3, otherwise, goes to step 9；
3. creating temporary file, and message informing OFS manager creation disaster tolerance time point is sent, goes to step 4；
4.iSCSI Target receives iSCSI initiator request, and parsing iSCSI protocol request turns if read request
Step 5；If write request, 6 are gone to step；
5. customer in response end is to iSCSI volumes of read request：Parse metadata and caching that iSCSI protocol obtains read request
Buffer information；According to metadata lookup bitmap table；Request data storage location is determined according to lookup result, if all number of requests
According to original is stored in, then read from original corresponding region；If all request datas are stored in temporary file, from original
It reads file corresponding region；If request data part is stored in original, it is partially stored in temporary file, then is first read from original
It takes, then is read from temporary file, returned after combining data；
6. customer in response end is to iSCSI volumes of write request；The corresponding region of temporary file is navigated to according to metadata information,
Write data into the region；Update bitmap table；OFS reader is sent the data to, notice OFS reader writes data into the time
Point object；
7. continuing to monitor iSCSI protocol request, 4 are gone to step；
8. stopping task：Task normally stops, the data of iSCSI module and consistency proxy collaboration progress disaster tolerance time point
Consistency treatment, NFS manager needs release position chart memory source and deletes temporary file before exiting, when OFS retains disaster tolerance
Between point；The abnormal end of task, OFS manager delete disaster tolerance time point, and NFS manager needs release position chart memory source and deletes
Except temporary file；
9. task terminates.
Embodiment citing：
The present invention is stored in the OFS based on object-based file system and deposits mainly by CDP data block after consistency treatment
In storage media and NFS storage medium based on native file system, after leading to operation system exception due to business volume failure, lead to
It crosses iSCSI virtual disk technology to roll up the data extension in NFS medium at occasional service, is used for operation system, realize business system
The momentary recovery of system；Meanwhile disaster tolerance time point is created on OFS, occasional service is rolled up and carries out data protection, and in OFS medium
On find the NFS media data hung up and correspond to time point, row data are involved in former business and are restored, which completes
Afterwards, it is selected according to user, after occasional service volume unloading, disaster tolerance time point data is restored to former business and is rolled up, realizes business system
System switchback.Specific implementation process of the invention is as follows：
Precondition：The host where subscriber service system installs backup client, this client mainly includes using one
Cause property proxy module, CDP module, iSCSI Initiator module, data transmission module, control module.Need to provide a master
Machine installs backup server end on this host, this server end mainly includes iSCSI Target module, OFS medium management
Module and NFS medium management module.
1. hypothesis has created one based on the real-time of the SQL Server database on AppServer1 on application server
Task CDPJob1, according to the data source that SQL consistency module provides, after CDP module screens duplicate removal, obtained supervised path is
E disk on AppServer1；
2. backup services execute CDPJob1, CDP module carries out initial work to E disk, and data pass through data transmission module
It is transmitted to backup server end, initialization data block is written Tp0 pairs by OFS medium management module creation initialization time point Tp0
As under, NFS medium first creates the corresponding catalogue of CDPJob1, then Object_E file is created under catalogue, by initialization data block
Object_E is written；This process, the driving of bottom disk filter have been switched on monitoring, and disk delta data is remembered with format
Record is in log buffer file.
3. initialization is completed, into the incremental replication stage, CDP module extracts incremental data from log buffer, passes through transmission
Module sends incremental data to backup server end.This process, CDP module can generate frequency ginseng according to the time point of CDPJob1
Number calls the interface provided using consistency module, completes to the consistency of current point in time with the driving of bottom disk filter
Reason.
4.OFS media manager produces a series of time point Tp1, Tp2 ... TpN according to consistency treatment strategy, directly will
Corresponding incremental data be stored in time point catalogue under；Unlike this, because only that a copy, increment inside NFS
Data block cannot be write direct, and incremental data block is first cached by NFS media manager, consistent until completely receiving one
Property process cycle incremental data, Object_E file is written in data in it will cache.
5. assuming n-hour, failure is had occurred in operation system, and CDPJob1 is abnormal, and the control module of client is sent messages to
Backup server end, the forwarding of backup server end are abnormal to OFS media manager and NFS value control device, OFS media manager
It deletes TpN time point object and its ancillary data block, NFS media manager first checks whether all complete consistency periodicities
According to Object_E file has all been synchronized to, then the data in caching are being deleted.Then CDPJob1 is terminated.
6. user initiates carry recovery tasks RecoverJob1, by iSCSI virtual disk technology by Object_E carry
To AppServer1, system distributes label F automatically, and user's manual modification applies path, restarts application service, F volumes initially as
Occasional service volume replaces former business and rolls up E.At the same time, NFS media manager is notified that OFS media manager creates the disaster tolerance time
Point RTP0, and parse iSCSI protocol writes data block request, and newly-increased data are issued OFS media manager and are stored in RTP0.
7. backup manager will initiate recovery tasks at the same time, if user has selected to repair former business volume E
RecoverJob2 selects Tp (N-1) time point in OFS medium, restores to repair the data on E volumes by browsing.
After the completion of RecoverJob2, it is notified that user, selection is at night or midnight business not busy time, stopping operation system terminating
The data of time point RTP0 are restored to E volumes by RecoverJob1, and after RTP0 runs succeeded, path is applied in modification, by business
Volume switchs to E, is restoring operation system, is starting CDPJob1.So far, operation system is completed to restore from failure.
Claims (8)
1. a kind of apply disaster recovery method based on CDP and iSCSI virtual disk technology, which is characterized in that this method utilizes CDP skill
Art and iSCSI virtual disk technology；
CDP data block is respectively stored in OFS storage medium and NFS storage medium first, wherein OFS is object-based file system,
NFS is native file system；
Secondly, the data in NFS storage medium are first passed through iSCSI virtual disk technology tissue after business rolls up corrupted data
It is mounted on host and is rolled up as occasional service in rolls, used for host service system, and Added Business data are saved in OFS and are deposited
Storage media, meanwhile, data recovery is done to former business volume with the data in OFS storage medium；
After the completion of former business volume data are restored, the time of a business free time is selected, operation system is stopped, completing newly-increased data
It is restored to former business volume, operation system switchback original business is rolled up.
2. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 1, feature
It is,
It is described CDP data block to be respectively stored in OFS storage medium and NFS storage medium specifically includes following steps：
1) it transmits：The source volume data block after initialization is transferred to the end Console by network；
2) storing initial data：Initialization data block synchronization distribution is read and write to OFS by the medium management module at the end Console
Device and NFS reader, the OFS reader and NFS reader, will be first according to predefined initialization data block processing strategie
Beginningization data block is respectively written into OFS storage medium and NFS storage medium；
3) incremental data is obtained：Strategy is transmitted according to predefined incremental data, CDP incremental data block is transferred to Console
End；
4) incremental data is stored：By the medium management module at the end Console by incremental data block synchronization distribution to OFS reader and
NFS reader, the OFS reader and NFS reader are according to predefined incremental data block processing strategie, by incremental data
Block is respectively written into OFS storage medium and NFS storage medium；
It is described when business roll up corrupted data after, first the data in NFS storage medium are organized by iSCSI virtual disk technology
It is wrapping with to be downloaded on host and be rolled up as occasional service, used for host service system, and Added Business data are saved in OFS storage
Medium, meanwhile, data recovery is done to former business volume with the data in OFS storage medium, specifically includes following steps：
5) carry restores：It is virtual by iSCSI after subscriber service system causes operation system to be interrupted due to reel corrupted data
Magnetic disc comes out the respective file carry being stored on NFS medium, temporarily uses for subscriber service system, creates in memory
Bitmap table is built, for marking region of variation；Temporary file is created on NFS medium, for storing newly-increased data；In OFS medium
One time point object of upper creation, for backing up newly-increased data；
6) operation system is responded to iSCSI volumes of write request：The synchronous temporary file that will be created in newly-increased data write step 5
In, and bitmap table corresponding region is updated, the asynchronous OFS time point object for creating newly-increased data write step 5；
7) operation system is responded to iSCSI volumes of read request：According to metadata lookup bitmap table, in original or temporary file
Corresponding region read block returns to iSCSI Initaitor.
3. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, feature
It is, the storing initial data, including following sub-step：
21) medium management module receives initialization data block；
22) medium management module is by initialization data block synchronization distribution to OFS reader and NFS reader；
23) corresponding region of initialization time point object is written according to data block summary info by OFS reader for data block；
24) the file corresponding region named with reel is written according to data block summary info by NFS reader for data block.
4. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, feature
It is, the storage incremental data, including following sub-step：
31) medium management module receives incremental data block；
32) medium management module is by incremental data block synchronization distribution to OFS reader and NFS reader；
33) OFS reader handles data block according to data block's attribute and summary info, if time point object, is then situated between in OFS
Increase time point object in matter newly；If data object, then the correspondence of current time point object is write data into according to summary info
Region；
34) different according to data block's attribute after NFS reader receives incremental data block, do different disposal：If incremental data
Object, then by data buffer storage to local cache area；If data object, then volume object file is written into the data in caching.
5. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 4, feature
It is, the local cache area, refers to that the configurable self-defining data block of the size being made of memory and NFS volumes temporarily stores
Area.
6. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, feature
It is, the response operation system is to iSCSI volumes of write request, including following sub-step：
41) parsing iSCSI protocol obtains the metadata and data information of write request；
42) corresponding region that temporary file is navigated to according to metadata information, writes data into the region；
43) bitmap table is updated；
44) OFS reader is sent the data to, notice OFS reader writes data into time point object；
45) iSCSI Initaitor is returned message to.
7. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 6, feature
Be, the temporary file, be for temporarily store iSCSI volumes be supplied to subscriber service system use during newly-increased number
According to.
8. a kind of application disaster recovery method based on CDP and iSCSI virtual disk technology according to claim 2, feature
It is, the response operation system is to iSCSI volumes of read request, including following sub-step：
51) parsing iSCSI protocol obtains the metadata and caching Buffer information of read request；
52) according to metadata lookup bitmap table；
53) request data storage location is determined according to lookup result；
54) data are read and are put into caching Buffer；
55) iSCSI Initaitor is returned message to.
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| CN101668048A (en) * | 2009-09-28 | 2010-03-10 | 武汉大学 | Data protection method and system for supporting any time data access and modification |
| CN103336728A (en) * | 2013-05-08 | 2013-10-02 | 上海爱数软件有限公司 | Disk data recovery method |
| CN103530204A (en) * | 2013-10-15 | 2014-01-22 | 上海爱数软件有限公司 | Method and system for real-time data backup |
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| CN101668048A (en) * | 2009-09-28 | 2010-03-10 | 武汉大学 | Data protection method and system for supporting any time data access and modification |
| CN103336728A (en) * | 2013-05-08 | 2013-10-02 | 上海爱数软件有限公司 | Disk data recovery method |
| CN103530204A (en) * | 2013-10-15 | 2014-01-22 | 上海爱数软件有限公司 | Method and system for real-time data backup |
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