CN106502835B - A kind of disaster-tolerant backup method and device - Google Patents
A kind of disaster-tolerant backup method and device Download PDFInfo
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- CN106502835B CN106502835B CN201610943435.9A CN201610943435A CN106502835B CN 106502835 B CN106502835 B CN 106502835B CN 201610943435 A CN201610943435 A CN 201610943435A CN 106502835 B CN106502835 B CN 106502835B
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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
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
- G06F11/1464—Management of the backup or restore process for networked environments
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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
- G06F11/1479—Generic software techniques for error detection or fault masking
- G06F11/1489—Generic software techniques for error detection or fault masking through recovery blocks
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Abstract
The present invention provides a kind of disaster-tolerant backup method and device, the disaster-tolerant backup method includes：Judge whether backup node is in data sync break state；When backup node is in data sync break state, judge whether the time of final updating data and the time difference of system time are less than first time threshold in host node；If the time of final updating data and the time difference of system time are less than first time threshold in host node, start backup node synchrodata from host node；Poll detects backup node, when backup node, which completes data, to be synchronized, stops backup node synchrodata.Using disaster-tolerant backup method provided in an embodiment of the present invention and device, remote control can be carried out to each controlled end node, realize procedure and the automation of the duplication of strange land data and backup.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of disaster-tolerant backup methods and device.
Background technology
With the fast development of information technology, information security increasingly becomes asking of being widely noticed in each field of every profession and trade
Topic is realized although the development of computer provides the more more efficiently information service in real time than ever for people
The automation of information storage and management, but hidden danger caused by the extensive use of computer is also very big.Once meter
Calculation machine system is by irreversible destruction, it will leads to massive losses.For the fast quick-recovery data after calamity, in the prior art one
As use data backup the methods of method, including manual backup, automated back-up, NetApp SnapMirror softwares have warp
High efficiency, simplification and the reasonable cost of verification are crossed, therefore the software is always in various NetApp storage environments for many years
It carries out replicating the one preferred technique with disaster recovery, although the strange land that data efficient may be implemented in NetApp SnapMirror is replicated
And backup, but need manually to control the strange land transmission of data.
Invention content
In order to solve the above technical problems, the present invention provides a kind of disaster-tolerant backup method and devices.
One aspect of the present invention provides a kind of disaster-tolerant backup method, and the disaster-tolerant backup method includes：
Judge whether backup node is in data sync break state；
When the backup node is in data sync break state, judge in host node the time of final updating data with
Whether the time difference of system time is less than first time threshold；
If the time of final updating data and the time difference of system time are less than first time threshold in the host node,
Start the backup node from synchrodata from the host node；
Poll detects the backup node, and when the backup node, which completes data, to be synchronized, it is same to stop the backup node
Step data.
In one embodiment, described if the backup node can not be stopped when the backup node, which completes data, to be synchronized
Disaster-tolerant backup method further includes：Poll detects one preset time of host node, if the host node is in the preset time
Interior stopping receives external data, then stops the backup node synchrodata.
In one embodiment, the disaster-tolerant backup method further includes：If the state of the host node is when described default
It is interior not stop receiving external data, then warning information is sent out, disaster tolerance is carried out and reports an error.
In one embodiment, when the backup node, which completes data, to be synchronized, the disaster-tolerant backup method further includes：
Judge the time of the time of last synchrodata and final updating data in the host node in the backup node
Time difference whether be less than second time threshold；
When the time of last synchrodata in the backup node and the time of final updating data in the host node
When time difference is less than the second time threshold, stop the backup node synchrodata.
In one embodiment, the time of final updating data and the time difference of system time are less than the in the host node
One time threshold, starts the backup node after synchrodata from the host node, and the disaster-tolerant backup method further includes：Sentence
The backup node break whether still in data sync break state, if the backup node is still in data sync break shape
State restarts the backup node and carries out data synchronization.
In one embodiment, the disaster-tolerant backup method further includes：Start timing after starting the backup node, and examines
Survey the backup node currently carry out data synchronization overall time whether be more than third time threshold, if it is, sending out announcement
Alert information carries out disaster tolerance and reports an error.
In one embodiment, the disaster-tolerant backup method further includes：Judge whether backup node is in data sync break
When the result of state is no, warning information is sent out, disaster tolerance is carried out and reports an error.
In one embodiment, the disaster-tolerant backup method further includes：When last synchrodata in the backup node
Between when being more than the second time threshold with time difference of the time of final updating data in the host node, make the backup section
Point continues synchrodata.
On the other hand the embodiment of the present invention additionally provides a kind of disaster-tolerant backup device, the disaster-tolerant backup device includes：
Backup node access unit, for judging whether backup node is in data sync break state；
Host node access unit, for judging that the time of final updating data and the time difference of system time are in host node
It is no to be less than first time threshold；
Backup node start unit, for when the time of final updating data and the time of system time in the host node
When difference is less than first time threshold, start the backup node from synchrodata from the host node；
Polling system unit detects the backup node for poll, when the backup node, which completes data, to be synchronized, stops
The only backup node synchrodata.
In one embodiment, described if the backup node can not be stopped when the backup node, which completes data, to be synchronized
Polling system unit is additionally operable to：Poll detects one preset time of host node, if the host node is in the preset time
Interior stopping receives external data, then stops the backup node synchrodata.
In one embodiment, the disaster-tolerant backup device further includes：Report an error unit, exists for the state when the host node
Do not stop sending out warning information when receiving external data in the preset time, carries out disaster tolerance and report an error.
In one embodiment, the polling system unit further includes：
Time difference judgment module, for judging in the backup node in the time of last synchrodata and the host node
Whether the time difference of the time of final updating data is less than second time threshold；
Node interrupts module, for when last in the time of last synchrodata in the backup node and the host node
When the time difference of the time updated the data is less than the second time threshold, stop the backup node synchrodata.
In one embodiment, the polling system unit further includes：
Judgment module, after the backup node start unit starts backup node, for judging that the backup node is
It is no still in data sync break state；
Module is restarted, is used for when the backup node is still in data sync break state, described in restarting
Backup node carries out data synchronization.
In one embodiment, the disaster-tolerant backup device further includes a timing unit, for starting the backup node
After start timing, and detect the backup node currently carry out data synchronization overall time whether be more than third time threshold,
When the overall time that the backup node currently carries out data synchronization is more than the third time threshold, the unit hair that reports an error
Go out warning information, carries out disaster tolerance and report an error.
In one embodiment, the unit that reports an error is additionally operable to when the output result of backup node access unit is no, hair
Go out warning information, carries out disaster tolerance and report an error.
In one embodiment, the polling system unit further includes：Update module, for working as the time difference judgment module
Output result when being no, so that the backup node is continued synchrodata.
In one embodiment, the disaster-tolerant backup device is set in the backup node, and the disaster-tolerant backup device is logical
It crosses SSH and remotely accesses the host node, wherein SSH indicates safety shell protocol.
In one embodiment, the disaster-tolerant backup device is set in the host node, and the disaster-tolerant backup device passes through
SSH remotely accesses the backup node.
In one embodiment, the disaster-tolerant backup is installed on except the backup node and host node and is independently arranged.
Using disaster-tolerant backup method provided in an embodiment of the present invention and device, each controlled end node can remotely be controlled
System realizes procedure and the automation of the duplication of strange land data and backup.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow diagram of disaster-tolerant backup method of the embodiment of the present invention；
Fig. 2 is the flow diagram of the another disaster-tolerant backup method of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of disaster-tolerant backup device of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of polling system of embodiment of the present invention unit 4；
Fig. 5 is the Organization Chart of disaster-tolerant backup device of the embodiment of the present invention；
Fig. 6 is the control structure figure of the another disaster tolerance system of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention has supplied the embodiment of a disaster-tolerant backup method, as shown in Figure 1, this method mainly includes the following steps that：
Step S1, judge whether backup node is in data sync break state.
It such as crosses backup node and is currently at data sync break state, illustrate to meet the requirement for continuing synchrodata, if
The output result of step S1 is no, illustrates that backup node does not meet the requirement for continuing synchrodata, needs to send out warning information, into
Row disaster tolerance reports an error (step S6), no longer executes following steps.
Step S2, when backup node is in data sync break state, further judge final updating number in host node
According to time and system time time difference whether be less than first time threshold.
External data is received by host node due to being at the beginning in the embodiment of the present invention, and backup node is from host node
Middle replicate data, data source are host nodes, access host node by step S2, determine the time of host node final updating data
Whether it is less than a preset time threshold with the time difference of system time, if it does, illustrating final updating data in host node
Time and external data source basic synchronization, subsequent step can be executed.It may thus be appreciated that the main function of the step is to determine master
Whether acquired external data is newest data in node.
In one embodiment, above-mentioned time threshold usually takes 15 minutes, that is, allows final updating data in host node
The time difference of time and current time in system, in 15 minutes, warning information was then sent out more than 15 minutes, and progress disaster tolerance, which reports an error, (to be walked
Rapid S6).
If step S3, the time of final updating data and the time difference of system time are less than first time threshold in host node
Value starts backup node synchrodata from host node.
If time difference of the time of final updating data compared with the current time in system is no more than 15 minutes in host node,
It can then start backup node using the external data of host node final updating as latest data and carry out data from host node
It is synchronous.
Step S4, poll detects backup node, judges whether backup node completes data synchronization.
Step S5, when backup node, which completes data, to be synchronously completed, stop backup node synchrodata.
The embodiment of the present invention goes the external data obtained in host node by SSH remote control backup nodes, to ensure number
According to being synchronized on backup node, when implementing the embodiment of the present invention, it is only necessary to be managed, manage to a backup node
Object is simple, realizes procedure and the automation of strange land data duplication and backup.
In one embodiment, when backup node, which completes data, to be synchronized, normally can backup node be stopped by step S5, made
Its state becomes data sync break state.But if host node is receiving external data at this time, i.e. host node is in number
According to transmission state, even if backup node completes data synchronization at this time, it is also possible to can not be stopped, repeating to report in order to prevent
Mistake has been preset a buffer time to host node, and poll detects the host node pre-set buffer time, if the state of host node is at this
Idle state (stopping receiving external data) is converted in the pre-set buffer time, then being possible to be successfully closed backup section
Point.If the state of host node does not stop receiving external data in above-mentioned preset time, warning information is sent out, carries out disaster tolerance
It reports an error.
Fig. 2 is also the flow diagram of disaster-tolerant backup method provided in an embodiment of the present invention.As shown in Fig. 2, being examined in poll
Still whether it further includes a judgment step S7 to survey between backup node and stopping backup node synchrodata, for judging backup node
In data sync break state, if backup node still in data sync break state, illustrates that step S3 fails and opens
Dynamic backup node needs to restart backup node progress data synchronization at this time.
As shown in Fig. 2, when backup node completes data synchronization, which further includes a step S8, is judged
Whether the time difference of the time of final updating data is less than for the moment in the time of last synchrodata and host node in backup node
Between threshold value, and the time difference of the time of final updating data is small in the time of last synchrodata and host node in the backup node
When the time threshold, stop backup node synchrodata.The step is mainly used for replicating in standby node completion data laggard
Row verification, it is ensured that the data of backup node final updating are the newest external datas in host node.When last same in backup node
In the time of step data and host node the time difference of the time of final updating data be more than the time threshold when, make backup node after
Continuous synchrodata.Wherein, time threshold herein can take 5 minutes, can also take 15 minutes, but typically no less than 5 minutes.
Disaster-tolerant backup method provided in an embodiment of the present invention further includes a timed process (being not shown in Fig. 2), standby when starting
Part node from host node synchrodata when, in order to avoid backup node hangs up (i.e. hang is dead), the embodiment of the present invention is also set
A time threshold is determined, has started timing while starting backup node, detection backup node currently carries out the whole of data synchronization
Whether the body time is more than this time threshold, if so reports an error with regard to carrying out disaster tolerance.The time threshold usually takes 40 minutes,
It should be controlled in 40 minutes that is, backup node carries out the time used in the overall process of data synchronization from host node, beyond at this time
Between threshold value illustrate that special circumstances occurs in data synchronization process, the dead situations of hang, the inspection of this threshold value may occur for certain steps
It is the bottom-line plan for ensureing that entire data synchronization process is controllable.
Based on inventive concept identical with Fig. 1 and disaster-tolerant backup method shown in Fig. 2, inventive embodiments additionally provide one kind
Disaster-tolerant backup device, as described in following example.The principle and disaster-tolerant backup method solved the problems, such as due to the disaster-tolerant backup device
It is similar, therefore the implementation of the disaster-tolerant backup device may refer to the implementation of disaster-tolerant backup method, overlaps will not be repeated.
Fig. 3 is the structural schematic diagram of disaster-tolerant backup device of the embodiment of the present invention, as shown in figure 3, the disaster-tolerant backup device packet
It includes：Backup node access unit 1, host node access unit 2, backup node start unit 3 and polling system unit 4.Wherein, standby
Part node visit unit 1 is for judging whether backup node is in data sync break state；Host node access unit 2 is for sentencing
Whether the time of final updating data and the time difference of system time are less than first time threshold in disconnected host node；Backup node opens
Moving cell 3 is used for when the time of final updating data in host node and the time difference of system time being less than first time threshold,
Start backup node synchrodata from host node；Polling system unit 4 detects backup node for poll, when backup node is complete
When being synchronized at data, stop backup node synchrodata.
In one embodiment, when backup node, which completes data, to be synchronized, if backup node can not be stopped, then above-mentioned poll
Control unit 4 can be also used for poll detection one preset time of host node, if host node stops receiving in the preset time
External data can then stop backup node synchrodata.
In one embodiment, above-mentioned disaster-tolerant backup device further includes reporting an error unit 5 for when the state of host node exists
It states and does not stop sending out warning information when receiving external data in preset time, carry out disaster tolerance and report an error.
As shown in figure 4, above-mentioned polling system unit 4 includes a time difference judgment module 41 and node interrupts module 42.
Time difference judgment module 41 is used to judge in backup node final updating data in the time of last synchrodata and host node
Whether the time difference of time is less than second time threshold；Node interrupts module 42 is used for when last synchrodata in backup node
When the time difference of time and the time of final updating data in host node are less than above-mentioned second time threshold, it is same to stop backup node
Step data.Above-mentioned second time threshold can take not less than 5 minutes.
In one embodiment, polling system unit 4 further includes a judgment module 43 and one restarting module 44, judges mould
Whether block 43 is used for after backup node start unit 3 starts backup node, for judging backup node still in data synchronization
Interrupt status；It restarts module 44 to be used for when backup node is still in data sync break state, restarting backup section
Row data are clicked through to synchronize.After backup node start unit 3 starts backup node, if it is determined that the judging result of module 43 is standby
Part node remains as data sync break state, illustrates that backup node fails startups, needs restarting 44 duplicate removal of module
It opens backup node and carries out data synchronization.
In one embodiment, above-mentioned calamity back-up device further includes a timing unit 6, and timing unit 6 is used for standby in startup
Start timing after part node, and detects backup node and whether currently carry out the overall time of data synchronization more than third time threshold
Value, when the overall time that backup node currently carries out data synchronization is more than second time threshold, the unit 5 that reports an error sends out alarm letter
Breath carries out disaster tolerance and reports an error.
In one embodiment, (the initial state of backup node when the output result of backup node access unit 1 is no
It is not data sync break state), the unit 6 that reports an error can send out warning information, carry out disaster tolerance and report an error.
In one embodiment, polling system unit 4 further includes a update module 45, for when time difference judgment module 41
When output result is no, backup node start unit 3 is jumped to, starts backup node and continues to the same step number from host node
According to.
Using disaster-tolerant backup method provided in an embodiment of the present invention and device, each controlled end node can remotely be controlled
System realizes procedure and the automation of the duplication of strange land data and backup.
Above-mentioned disaster-tolerant backup device can be arranged in backup node, can also be arranged in the master node, or also may be used
To be independently disposed to except host node and backup node.When disaster-tolerant backup device is arranged in backup node, disaster-tolerant backup dress
The host node can be remotely accessed by SSH (Secure Shell, safety shell protocol) by setting.Disaster-tolerant backup device is set to
When in host node, backup node can be remotely accessed by SSH.When disaster-tolerant backup is installed on except backup node and host node solely
It erects when setting, SSH can be passed through and remotely access host node and backup node.
Fig. 5 is the one of which configuration structure of disaster-tolerant backup device provided in an embodiment of the present invention.The present invention is only to hold
Calamity back-up device not limits the invention independently of being illustrated for being arranged except host node, backup node.Such as figure
Shown in 5, for host node for obtaining external source data, backup node is used for from host node replicate data to carry out data synchronization,
Disaster-tolerant backup device except host node, backup node independently of being arranged, with backup node and host node respectively by network connection,
It can respectively be accessed to active and standby part node by SSH, for controlling backup node replicate data from host node.
Disaster-tolerant backup method, server and the system that embodiment provides for a better understanding of the present invention, with reference to tool
The example of body illustrates.
NetApp SnapMirror softwares have high efficiency, simplification and the reasonable cost by verification, therefore for many years
The software is always to carry out replicating the one preferred technique with disaster recovery in various NetApp storage environments.It can utilize
Network Appliance establish NetApp SnapMirror softwares on the basis of Data ONTAPP operating systems to build
Backup node in disaster tolerant backup system and host node utilize disaster-tolerant backup assembly monitor and remote control NetApp
Backup node in SnapMirror softwares and host node realize that teledata synchronizes according to control structure figure shown in Fig. 6.At this
In inventive embodiments, respectively by NetApp SnapMirror software deployments in the node of Pekinese two：A nodes and B node difference
As host node and backup node.
First, the relevant parameter for checking disaster-tolerant backup device further checks B node if parameter testing is normal
Whether state is data sync break (i.e. broken_off) state.If B node is not broken_off states, reports an error and move back
Go out, no longer executes following operation.
If B node is in broken_off states, meets the requirement for continuing synchrodata, further check A nodes
Whether the time of final updating data and the time difference of system time are less than 15 minutes.If A node final updating data when
Between it is slower than system time then continued poll A nodes 20 times more than 15 minutes, per minor tick 30 seconds, if A nodes are most after ten minutes
The time updated the data afterwards was not still synchronized to current time within 15 minutes, then reported an error and exit.
If the time of A node final updating data and the time difference of system time are less than 15 minutes, or to A node wheels
Find that the time of final updating data and the time difference of system time have been less than 15 minutes in A nodes, then illustrate that A is saved after asking repeatedly
Point has obtained newest external data, continues to execute subsequent step, starts B node, starts to carry out data synchronization (i.e. from A nodes
Start snapmirrior to replicate).
Start timing while starting B node, whether the overall time that detection B node carries out data synchronization is less than 40 points
Clock then reports an error and exits if it exceeds it is dead to illustrate within 40 minutes that hang may occur for system certain module in data synchronization process.
If the overall time that B node carries out data synchronization is no more than 40 minutes, continue subsequent step, poll inspection
Look into the state of B node and A nodes.Judge B node and A nodes whether be " snapmirrored＆transferring " state (i.e.
B node is in that data synchronously complete (snapmirrored) state and A nodes are in data transmission (transferring) shape
State), if it is, wait for the state for going to check A nodes and B node for 1 minute again, this be in check B node and A node states it
Before, need whether the overall time that the data to B node synchronize again was once judged again less than 40 minutes, only when B is saved
The state of B node and A nodes is just checked again for when the overall data synchronization time of point was still less than 40 minutes.A nodes are in
Transferring states refer to that external data is currently being received in A nodes, if stopping B node at this time, it is possible to it will not succeed,
In order to ensure successfully to stop B node, the step of checking A nodes is added in the embodiment, this mode is to present invention side
The further supplement of method and device related embodiment is not intended as the limitation of the present invention.
If B node and A nodes are not " snapmirrored＆transferring " states, further B node is judged
Whether it is that (i.e. B node is in snapmirrored states to " snapmirrored＆idle " state and A nodes are in A nodes
Idle (idle) state).It refers to that A nodes neither receive external data, while also not being passed to B node that A nodes, which are in idle states,
Transmission of data will not there is a situation where do not stop if stopping B node at this time.
If the state of B node and A nodes is not " snapmirrored＆idle " state, further judge B node and
Whether A nodes are that (i.e. B node is in data sync break state to " broken_off＆idle " state and A nodes are in the free time
State), if B node and A nodes are " broken_off＆idle " state, illustrate the not actuated success of B node, need to open again
Dynamic B node carries out data synchronization.In the specific implementation, can also further judgement only be done to B node, when B node is data
When sync break state, illustrate that B node fails startup, needs to restart B node and carry out synchrodata.
If the state of B node and A nodes is " snapmirrored＆idle " state, illustrates that data synchronize and finish, into
One step checks whether the time difference of the time with the time of A node final updating data of last synchrodata on B node are less than 5 points
Clock then illustrated that data synchronized success if it is less than 5 minutes, then executed update (update) order if it is greater than 5 minutes, B is made to save
Point continues from A node synchrodatas.When the time of the time of last synchrodata and final updating data in A nodes in B node
Difference when being less than 5 minutes, it is generally recognized that B node newest data in successful synchronization A nodes.
The embodiment of the present invention is realized by the way that disaster tolerance application server and NetApp SnapMirror softwares to be combined
Remote control of the administrative center to each controlled end node, and procedure and automation are realized, and it is automatically-monitored
The data synchronous regime of NetApp SnapMirror softwares, the teledata for realizing high-efficient automatic synchronize, and make long-range SSH
Data interaction becomes controllable, realizes the automated execution of remote command.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above example
Explanation be merely used to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (19)
1. a kind of disaster-tolerant backup method, which is characterized in that the disaster-tolerant backup method includes：
Judge whether backup node is in data sync break state；
When the backup node is in data sync break state, the time of final updating data and system in host node are judged
Whether the time difference of time is less than first time threshold；
If the time of final updating data and the time difference of system time are less than first time threshold in the host node, start
The backup node is from synchrodata from the host node；
Poll detects the backup node, when the backup node, which completes data, to be synchronized, stops the same step number of the backup node
According to.
2. disaster-tolerant backup method according to claim 1, which is characterized in that complete data when the backup node and synchronize
When, if can not stop the backup node, the disaster-tolerant backup method further includes：Poll detects the host node one when presetting
Between, if the host node stops receiving external data in the preset time, stop the backup node synchrodata.
3. disaster-tolerant backup method according to claim 2, which is characterized in that the disaster-tolerant backup method further includes：If
The state of the host node does not stop receiving external data in the preset time, then sends out warning information, carries out disaster tolerance report
It is wrong.
4. disaster-tolerant backup method according to claim 1 or 2, which is characterized in that when backup node completion data are same
When step, the disaster-tolerant backup method further includes：
Judge in the backup node time of final updating data in the time of last synchrodata and the host node when
Between difference whether be less than second time threshold；
When the time of the time of last synchrodata and the time of final updating data in the host node in the backup node
When difference is less than the second time threshold, stop the backup node synchrodata.
5. disaster-tolerant backup method according to claim 1, which is characterized in that the final updating data in the host node
Time and the time difference of system time are less than first time threshold, start the backup node from synchrodata from the host node
Afterwards, the disaster-tolerant backup method further includes：The backup node is judged whether still in data sync break state, if described
Backup node restarts the backup node and carries out data synchronization still in data sync break state.
6. disaster-tolerant backup method according to claim 1 or 5, which is characterized in that the disaster-tolerant backup method further includes：
Start timing after starting the backup node, and detect the backup node currently carry out data synchronization overall time it is whether big
In third time threshold, if it is, sending out warning information, carries out disaster tolerance and report an error.
7. disaster-tolerant backup method according to claim 1, which is characterized in that the disaster-tolerant backup method further includes：Judge
When the result whether backup node is in data sync break state is no, warning information is sent out, disaster tolerance is carried out and reports an error.
8. disaster-tolerant backup method according to claim 4, which is characterized in that the disaster-tolerant backup method further includes：Work as institute
The time difference for stating the time of final updating data in the time of last synchrodata and the host node in backup node is more than institute
When stating second time threshold, the backup node is made to continue synchrodata.
9. a kind of disaster-tolerant backup device, which is characterized in that the disaster-tolerant backup device includes：
Backup node access unit, for judging whether backup node is in data sync break state；
Host node access unit, for judging whether the time of final updating data and the time difference of system time are small in host node
In first time threshold；
Backup node start unit, for small when the time of final updating data in the host node and the time difference of system time
When first time threshold, start the backup node from synchrodata from the host node；
Polling system unit detects the backup node for poll, when the backup node, which completes data, to be synchronized, stops institute
State backup node synchrodata.
10. disaster-tolerant backup device according to claim 9, which is characterized in that complete data when the backup node and synchronize
When, if can not stop the backup node, the polling system unit is additionally operable to：Poll detects the host node one when presetting
Between, if the host node stops receiving external data in the preset time, stop the backup node synchrodata.
11. disaster-tolerant backup device according to claim 10, which is characterized in that the disaster-tolerant backup device further includes：Report
Wrong unit, for sending out alarm letter when the state of the host node does not stop the when of receiving external data in the preset time
Breath carries out disaster tolerance and reports an error.
12. disaster-tolerant backup device according to claim 9 or 10, which is characterized in that the polling system unit further includes：
Time difference judgment module, it is last in the time of last synchrodata and the host node for judging in the backup node
Whether the time difference of the time updated the data is less than second time threshold；
Node interrupts module, for when the time of last synchrodata in the backup node and final updating in the host node
When the time difference of the time of data is less than the second time threshold, stop the backup node synchrodata.
13. disaster-tolerant backup device according to claim 9, which is characterized in that the polling system unit further includes：
Judgment module, after the backup node start unit starts backup node, for judging the backup node whether still
In data sync break state；
Module is restarted, for when the backup node is still in data sync break state, restarting the backup
Node carries out data synchronization.
14. the disaster-tolerant backup device according to claim 9 or 13, which is characterized in that the disaster-tolerant backup device further includes
One timing unit for starting timing after starting the backup node, and detects the backup node currently to carry out data same
Whether the overall time of step is more than third time threshold, when the overall time that the backup node currently carries out data synchronization is more than
When the third time threshold, the unit that reports an error sends out warning information, carries out disaster tolerance and reports an error.
15. disaster-tolerant backup device according to claim 11, which is characterized in that the unit that reports an error is additionally operable to when backup section
When the output result of point access unit is no, warning information is sent out, disaster tolerance is carried out and reports an error.
16. disaster-tolerant backup device according to claim 12, which is characterized in that the polling system unit further includes：More
New module, for when the output result of the time difference judgment module is no, the backup node being made to continue synchrodata.
17. disaster-tolerant backup device according to claim 9, which is characterized in that the disaster-tolerant backup device is set to described
In backup node, the disaster-tolerant backup device remotely accesses the host node by SSH, wherein SSH indicates Secure Shell association
View.
18. disaster-tolerant backup device according to claim 9, which is characterized in that the disaster-tolerant backup device is set to described
In host node, the disaster-tolerant backup device remotely accesses the backup node by SSH.
19. disaster-tolerant backup device according to claim 9, which is characterized in that the disaster-tolerant backup is installed on the backup
It is independently arranged except node and host node.
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| CN107995282A (en) * | 2017-11-29 | 2018-05-04 | 北京悦畅科技有限公司 | Method of data synchronization, device, system and server |
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