CN108388484A - A kind of system and method ensureing CDP system IO consistency - Google Patents
A kind of system and method ensureing CDP system IO consistency Download PDFInfo
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- CN108388484A CN108388484A CN201810068999.1A CN201810068999A CN108388484A CN 108388484 A CN108388484 A CN 108388484A CN 201810068999 A CN201810068999 A CN 201810068999A CN 108388484 A CN108388484 A CN 108388484A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1438—Restarting or rejuvenating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/142—Reconfiguring to eliminate the error
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Abstract
The present invention relates to a kind of system and methods ensureing CDP system IO consistency, the system includes client, console and Ethernet, the client includes CDP kernel-driven modules, CDP scheduler modules, data transmission module and client control module, the console includes console control module and data memory module, the daily record volume of the CDP scheduler modules connection client host, the client further include respectively with CDP kernel-driven modules, the IO consistency mark modules of CDP scheduler modules connection, the daily record volume of the IO consistency mark modules connection client host, the IO consistency mark module in daily record volume to that can ensure that the consistency IO of system does consistency label.Compared with prior art, the present invention has the following advantages：Distinguish the IO and common IO of consistency, it is ensured that restore the system to coherency state.
Description
Technical field
The present invention relates to data backup disaster tolerance field, more particularly, to a kind of system ensureing CDP system IO consistency and
Method.
Background technology
With the fast development of computer technology, nowadays most enterprises all operate the core of oneself using computer
Business, the data generated therefrom also become the core wealth of enterprise, how to be effectively protected these core datas and also become
The huge challenge and focus of attention that enterprise faces.
Block grade CDP Data Protection Technologies are a kind of technologies of comparative maturity in data protection field, it is directly to block device
The IO of layer is monitored, and carries out initialization backup to volume to be protected first, generates initialization copy, is then carried out to monitoring volume
Incremental backup, real-time capture systems IO will fall the IO for rolling up region in monitoring and be redirected on storage medium, preserve monitoring volume region
The IO of all changes, to achieve the purpose that continuous data protection.
Although existing piece of grade CDP technology is capable of the IO of real-time capture systems and redirects storage, cannot be to capture
IO make effective differentiation.In the IO of CDP captures, not all IO can restore the system to a consistent character
State only selects specific IO just to can guarantee that the system after restoring is in coherency state.System conformance state refers to system
In data and metadata it is complete and correct.Existing piece of grade CDP technology does not distinguish the IO of capture, but will
All IO are uniformly treated, when doing system recovery, if selected IO time points cannot be guaranteed system conformance,
Harmful effect can be caused to the recovery of system, or even cause the damage of system.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of guarantee CDP system IO
The system and method for consistency.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of system ensureing CDP system IO consistency, which includes client, console and Ethernet, described
Client is connected with console by Ethernet, and the client and console carry out data biography by TCP/IP transport protocols
Defeated, the client is installed on the client host for needing to back up, and the console is installed on another console master
On machine, the client includes CDP kernel-drivens module, CDP scheduler modules, data transmission module and client control mould
Block, the console include console control module and data memory module, and the CDP scheduler modules connect client master
The daily record of machine is rolled up, it is characterised in that：The client further includes being connect respectively with CDP kernel-drivens module, CDP scheduler modules
IO consistency mark modules, the IO consistency mark modules connect the daily record volume of client host, and the IO is consistent
Property mark module to daily record volume in can ensure that the consistency IO of system does consistency label.
Preferably, consistency label is specially：
During CDP system captures IO, is parsed to falling the IO rolled up in system log in real time and analyze this
This IO is just labeled as consistency IO by the content of IO if meeting consistency IO features；
When carrying out system recovery, selected arbitrary IO time points are recalculated, computational methods are：From this
Meaning IO time points start to find first consistency IO as the end IO actually restored according to the incremental sequence of timestamp.
Preferably, daily record volume is that client host ext3 and ext4 file system opens ordered logging modes
Or after journal logging modes, the continuous spaces 128MB that system is distributed on physical disk, also referred to as journal block
Device, abbreviation jbd.
Preferably, each data block in the jbd is known as journal_header_ there are one general header structure
s；
H_magic in the header structure is fixed signal value 0xC03B3998, shows that this data block is used in jbd
In the data block of management；
H_blocktype in the header structure shows that the data block is which type of jbd blocks：It is to retouch for 1 explanation
Block is stated, the beginning of one affairs of label is used for；It is to submit block for 2 explanations, is used for the end of one affairs of label；It is said for 3 or 4
Bright is daily record superblock；It is revocation block for 5 explanations.
Preferably, described to ensure that the consistency IO of system need to ensure that the data before this IO all have been written to
On disk and be it is complete correctly, the consistency IO that can ensure system has following characteristics：The IO is fallen
The regions system jbd, and the content of this IO is started with value of statistical indicant 0xC03B3998, the h_blocktype of the IO is 2.
Preferably, the consistency is labeled as that a mark value of coherency state can be restored the system to, if
Can restore the system to coherency state then the IO mark value be 1, otherwise mark value be 0.
A kind of method of the system of the guarantee CDP system IO consistency, includes the following steps：
(1) .IO consistency labeling process：
(1.1) the task initializations stage opens the ordered logging modes or journal logging modes of monitoring volume,
Section of the syslog file on monitoring volume, i.e. initial position and end position are obtained simultaneously；
(1.2) initializes duplicate stage：The data of monitoring volume are copied into mirrored volume, in this stage not to capture
IO does consistency judgement；
(1.3) the incremental replications stage：Each IO of CDP system capture has offset and length information, according to the inclined of IO
It moves and judges whether the IO falls in system log regional extent with length；If the IO is fallen in system log regional extent
It is interior, and meet consistency IO features, then consistency label is done to the IO, otherwise does nonuniformity label；
(2) system recovery procedures：
(2.1) configure system restore parameter, including selection restore IO time points, to be restored volume information, recovery position
It sets, remarks；
(2.2) recalculates the arbitrary IO time points of selection：According to timestamp since the arbitrary IO time points
Incremental sequence finds first consistency IO as the end IO actually restored；If do not had according to the incremental sequence of timestamp
Consistency IO is found, then finds first consistency IO conduct according to the sequence that timestamp successively decreases since the arbitrary IO time points
The end IO actually restored；If consistency IO is not all found according to the sequence for being incremented by and successively decreasing, just currently to select
Arbitrary IO time points IO as restore end IO；
(2.3) if has found consistency IO in (2.2) step, system data is restored to consistency IO
Restore the system to a coherency state；If not finding consistency IO in (2.2) step, executing, data are extensive
After multiple, the volume progress reparation appropriate to recovery is needed just to can ensure that system is in coherency state.
Compared with prior art, the present invention has the following advantages：
1, consistency IO signatures are done by the IO to capture, will be able to ensure that the IO and common IO of system conformance
It distinguishes.
2, when system is restored, there is the IO of signature that there is good directive significance, select arbitrary IO time points
A coherency state can be restored the system to when doing system recovery.
Description of the drawings
Fig. 1 is 5 layers of structure chart of ICP/IP protocol；
Fig. 2 is the CDP system structure chart of the present invention；
Fig. 3 is the CDP system back-up job flow chart of the present invention；
Fig. 4 is that CDP system of the present invention is resumed work flow chart.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is a part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work should all belong to the model that the present invention protects
It encloses.
The present invention is the improvement made on original CDP standby systems.Former CDP backup/restoration systems structure chart such as Fig. 2 institutes
Show, system is made of client, console two parts, and the two is connected by Ethernet, using TCP/IP transport protocols into line number
According to transmission.5 layers of structure chart of ICP/IP protocol are as shown in Figure 1.In order to realize consistency IO labels on original CDP standby systems
Function needs to increase IO consistency mark function modules.The function module only influences system client, to console it goes without doing appoint
What is changed.
As depicted in figs. 1 and 2, a kind of system ensureing CDP system IO consistency, which includes client, console
And Ethernet, the client are connected with console by Ethernet, the client and console are passed by TCP/IP
Defeated agreement carries out data transmission, and the client is installed on the client host for needing to back up, console installation
In on another console host, the client includes CDP kernel-drivens module, CDP scheduler modules, data transmission module
With client control module, the console includes console control module and data memory module, and the CDP dispatches mould
Block connects the daily record volume of client host, and the client further includes IO consistency mark modules, the IO consistency marks
Remember the daily record volume of module connection client host, the IO consistency mark module in daily record volume to that can ensure system
Consistency IO does consistency label.
The daily record volume is that ext3, ext4 file system open ordered logging modes or journal daily record moulds
After formula, the continuous spaces 128MB that system is distributed on physical disk, also referred to as journal block device, abbreviation jbd.
Jbd using a daily record superblock as starting, behind sequentially store multiple affairs.There are one general for each data block in jbd
Header structure be known as journal_header_s, the h_magic in the header structure is fixed signal value 0xC03B3998, be used for table
This bright data block is the data block for management in jbd；H_blocktype is used for showing that the data block is which type of
Jbd blocks：It is description block for 1 explanation, is used for the beginning of one affairs of label；It is to submit block for 2 explanations, is used for one affairs of label
End；It is daily record superblock for 3 or 4 explanations；It is revocation block for 5 explanations.
The general process that system writes data is：First data content is write on disk final position, while being generated in jbd
One affairs is used for recording the metadata during this write operation, and data content is being write disk and relevant transaction write
To after jbd, metadata can just be write on the final position of disk.One affairs is using a description block as starting, intermediate meeting
There are multiple meta data blocks, finally submit block as terminating using one, each affairs are atomic operations, only in affairs submission block
After jbd is written, this affairs is just effective at last.One effective affairs can ensure the data being written before the affairs
(including data content and metadata) is all complete correct.
The consistency IO features refer to the IO with these features：The IO is fallen in the regions system jbd, and this IO
Content is started with value of statistical indicant 0xC03B3998, shows that the corresponding data blocks of this IO are the data blocks for management in jbd, simultaneously
The h_blocktype of this IO is 2, shows that it is that an effective affairs submit block, it is ensured that the number before this IO
According to all having been written on disk and being complete correct, that is, ensure the consistency of system data.
The consistency is labeled as that a mark value of coherency state can be restored the system to, if it is possible to will be
System be restored to coherency state then the IO mark value be 1, otherwise mark value be 0.
As shown in figure 3, the system backup workflow of the present invention：
1. installing CDP clients in the business host system for needing to back up, while CDP being installed on an other host
Console.CDP clients include CDP kernel-drivens module, CDP scheduler modules, IO consistency mark module, data transmission module
And control module.CDP consoles include data memory module and management module, main offer storage management and task management etc.
Function.
The workflow of 2.IO consistency label.
2.1CDP task creation processes：Some is selected to be connected to the client of console as backup from CDP consoles
Object creates the CDP task cdp_job based on the client host, the delta data of volume/opt on monitor client host, choosing
Client host volume/log is selected to roll up as daily record.
2.2 task initialization stages：After establishment task cdp_job, initiates data and replicate, CDP backup/restoration systems are first
The task can be initialized, task relevant parameter is set.At this stage, therefore, to assure that the ext3 or ext4 of FTP client FTP
File system uses ordered logging modes or journal logging modes (being defaulted as ordered logging modes), Zhi Houke
With the initial position syslog_start and end position of the superblock positioning system log region by rolling up file system
syslog_end。
2.3. duplicate stage is initialized：After the completion of task initialization, CDP scheduler modules, which are sent, starts monitoring message to CDP
Kernel-driven module, CDP kernel-driven modules start to capture the variation I/O data block in volume/regions opt, and by these I/O data blocks
Specific format is organized into be stored on daily record volume/log；Meanwhile CDP scheduler modules are according to the file system bitmap table on volume/opt
Initialization backup is carried out to volume/opt, initialization data is sent to by console by data transmission module, is transferred on console
Data memory module handled.
2.4. the incremental replication stage：After CDP scheduler modules complete the initialization duplication to volume/opt, start from daily record
The I/O data block that increment variation is extracted in volume/log, is sent to console by data transmission module, transfers to the number on console
It is handled according to memory module, after data block is handled successfully, CDP scheduler modules can delete the I/O data from daily record volume/log
Block.
2.5.I/O consistency labeling process：When starting the incremental replication stage, IO consistency mark functions are opened.CDP kernels
Drive capture every IO all can band offset offset and length length, before I/O data block is written to daily record volume/log
First judge whether this IO falls in system log region, works as syslog_start<=offset<=syslog_end or
syslog_start<=offset+length<When=syslog_end, indicate that the IO is fallen in system log region, i.e., this
IO can ensure the consistency of system, then the consistency mark value that this IO is just arranged is 1, it is otherwise 0.
The flow as shown in figure 4, system of the present invention is resumed work：
3.1.CDP recovery tasks create process：Cdp_job backup tasks before being selected in CDP consoles create base
In the CDP recovery tasks cdp_recovery of cdp_job backup tasks, and select by volume/opt at the IO moment at time point tp
Data be restored in volume/opt_recover.
3.2. the task initialization stage：After creating cdp_recovery recovery tasks, initiates data and restore, CDP backups are extensive
Complex system first can initialize the task, and task relevant parameter is arranged.At this stage, when can be to selected recovery IO
Between point tp recalculated：Since IO time point tp first consistency IO conduct is found according to the incremental sequence of timestamp
The end IO actually restored；If not finding consistency IO according to the incremental sequence of timestamp, since IO time point tp
First consistency IO is found as the end IO actually restored according to the sequence that timestamp successively decreases；If be incremented by according to timestamp
Consistency IO is not all found with the sequence successively decreased, then just using the corresponding IO of IO time point tp that currently select as restoring
Terminate IO.
3.3. Restoration stage：If having found consistency IO, just system data is restored at consistency IO, Ke Yibao
Card restores the system to a coherency state.If not finding consistency IO, IO time points are being restored data to
After the corresponding IO of tp, the volume progress reparation appropriate (execute and repair order) to recovery is needed just to can ensure that system is in consistency
State.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (7)
1. a kind of system ensureing CDP system IO consistency, which includes client, console and Ethernet, the visitor
Family end is connected with console by Ethernet, and the client and console carry out data biography by TCP/IP transport protocols
Defeated, the client is installed on the client host for needing to back up, and the console is installed on another console master
On machine, the client includes CDP kernel-drivens module, CDP scheduler modules, data transmission module and client control mould
Block, the console include console control module and data memory module, and the CDP scheduler modules connect client master
The daily record of machine is rolled up, it is characterised in that：The client further includes being connect respectively with CDP kernel-drivens module, CDP scheduler modules
IO consistency mark modules, the IO consistency mark modules connect the daily record volume of client host, and the IO is consistent
Property mark module to daily record volume in can ensure that the consistency IO of system does consistency label.
2. a kind of system ensureing CDP system IO consistency according to claim 1, it is characterised in that：Described is consistent
Property label be specially：
During CDP system captures IO, is parsed to falling the IO rolled up in system log in real time and analyze this IO's
This IO is just labeled as consistency IO by content if meeting consistency IO features；
When carrying out system recovery, selected arbitrary IO time points are recalculated, computational methods are：From the arbitrary IO
Time point starts to find first consistency IO as the end IO actually restored according to the incremental sequence of timestamp.
3. a kind of system ensureing CDP system IO consistency according to claim 1, it is characterised in that：The daily record
Volume is system after client host ext3 and ext4 file system opens ordered logging modes or journal logging modes
The continuous spaces 128MB distributed on physical disk, also referred to as journal block device, abbreviation jbd.
4. a kind of system ensureing CDP system IO consistency according to claim 3, it is characterised in that：In the jbd
Each data block be known as journal_header_s there are one general header structure；
H_magic in the header structure is fixed signal value 0xC03B3998, shows that this data block is to be used to manage in jbd
The data block of reason；
H_blocktype in the header structure shows that the data block is which type of jbd blocks：It is description block for 1 explanation,
Beginning for one affairs of label；It is to submit block for 2 explanations, is used for the end of one affairs of label；It is for 3 or 4 explanations
Daily record superblock；It is revocation block for 5 explanations.
5. a kind of system ensureing CDP system IO consistency according to claim 4, it is characterised in that：Described can
The consistency IO of guarantee system need to ensure that the data before this IO all have been written on disk and are complete correct, institutes
The consistency IO that can ensure system stated has following characteristics：The IO is fallen in the regions system jbd, and the content of this IO
Started with value of statistical indicant 0xC03B3998, the h_blocktype of the IO is 2.
6. a kind of system ensureing CDP system IO consistency according to claim 5, it is characterised in that：Described is consistent
Property labeled as a mark value of coherency state can be restored the system to, if it is possible to restore the system to coherency state
Then the mark value of the IO is 1, and otherwise mark value is 0.
7. a kind of method using the system described in claim 1 for ensureing CDP system IO consistency, which is characterized in that including
Following steps：
(1) .IO consistency labeling process：
(1.1) the task initializations stage opens the ordered logging modes or journal logging modes of monitoring volume, simultaneously
Obtain section of the syslog file on monitoring volume, i.e. initial position and end position；
(1.2) initializes duplicate stage：The data of monitoring volume are copied into mirrored volume, the IO of capture are not done in this stage
Consistency judges；
(1.3) the incremental replications stage：Each IO of CDP system capture has offset and length information, according to the offset of IO and
Length judges whether the IO falls in system log regional extent；If the IO is fallen in system log regional extent, and
And meet consistency IO features, then consistency label is done to the IO, otherwise does nonuniformity label；
(2) system recovery procedures：
(2.1) configure system restore parameter, including selection restore IO time points, to be restored volume information, recovery position,
Remarks；
(2.2) recalculates the arbitrary IO time points of selection：It is incremented by according to timestamp since the arbitrary IO time points
Sequence find first consistency IO as the end IO actually restored；If do not found according to the incremental sequence of timestamp
Consistency IO then finds first consistency IO as practical since the arbitrary IO time points according to the sequence that timestamp successively decreases
The end IO of recovery；If all not finding consistency IO according to the sequence for being incremented by and successively decreasing, just appointed with what is currently selected
The IO at meaning IO time points is as the end IO restored；
(2.3) if has found consistency IO in (2.2) step, system data, which is restored to consistency IO, will be
System is restored to a coherency state；If not finding consistency IO in (2.2) step, restore executing data
Afterwards, the volume progress reparation appropriate to recovery is needed just to can ensure that system is in coherency state.
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