CN102014152A - Long-distance duplicating system and method - Google Patents
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- CN102014152A CN102014152A CN2010105173140A CN201010517314A CN102014152A CN 102014152 A CN102014152 A CN 102014152A CN 2010105173140 A CN2010105173140 A CN 2010105173140A CN 201010517314 A CN201010517314 A CN 201010517314A CN 102014152 A CN102014152 A CN 102014152A
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Abstract
The invention provides a long-distance duplicating system and a long-distance duplicating method. The method comprises the following steps that: when sending backup data to a long-distance duplicating receiving end, a long-distance duplicating sending end only sends log data, which are changed at the current duplicating transmission time point relative to the previous duplicating transmission time point, of the long-distance duplicating sending end to the long-distance duplicating receiving end; and the long-distance duplicating receiving end calculates the log data at the current duplicating transmission time point of the long-distance duplicating sending end according to the changed log data as well as the log data, calculated by the long-distance duplicating receiving end last time, of the long-distance duplicating sending end, and reconstructs metadata according to the calculated log data. By the method, the data transmitted by network in the long-distance duplicating process can be reduced substantially to realize the precision and high efficiency of the transmission.
Description
Technical field
The present invention relates to a kind of Computer Applied Technology field, relate in particular to a kind of remote copy system and method thereof.
Background technology
The requirement of the quick growth of data and the high availability of data, fail safe has stimulated the development of memory technology,
Memory technology has become a key factor of IT infrastructure, and storage networking provides an effective hardware foundation for mass storage data and shared data.In the face of mass data; Data Protection and disaster recovery are also more and more important, and original data guard method, as tape backup; have that backup window is big, recovery time is long, real-time response is poor, influence drawback such as regular traffic, can't satisfy current demand.Use the online remote copy and the data redundancy of disk to become popular data protection technology.
At the other local available copy of portion that produces in real time, the use of this copy does not need to do data and recovers, and copy can be come into operation immediately with data.The largest benefit that data are duplicated is that copy data is available immediately, there is not data recovery times, recovery time target (Recovery Time Object, be called for short RTO) very good, simultaneously because be to duplicate in real time, RPO (Recovery Point Time is called for short RTO) is also very good, hardly can obliterated data.Wherein, but RTO is meant the time that information system is required from the disaster recovering state to running status, is used for weighing the traffic restoration capability of disaster tolerance system; RPO is meant the maximum data amount lost in the disaster process that operation system allows, and is used for weighing the data redundancy backup capabilities of disaster tolerance system.Shortcoming is that expense wants high more than data backup, it is not only data copy system price height, also need other hard-disc storage space and host computer system, even set up other remote equipment room, consider network layout, these all will bring cost to increase greatly, so construction that data are duplicated and maintenance cost are far longer than data backup.
Remote data duplicates following implementation at present:
(1) based on main frame: Host Based Data Replication Technology in Mobile, can not consider the isomorphism problem of storage system, as long as keeping main frame is the identical operations system, and the present data propagation software of supporting between the isomery main frame that also exists, just can support the data between the heterogeneous server to duplicate as BakBone NetVault Replicator, can support the remote live of crossing over wide area network to duplicate.Shortcoming is to take some host resources.
(2) based on storage system: the data propagation software that utilizes storage system to provide, the data flow of duplicating by transmit between the storage system and main frame irrelevant.The advantage of this mode is that data are duplicated and do not taken host resource, weak point is to need the storage system of Disaster Preparation Center and the storage system of the production center that strict compatible requirement is arranged, generally need be from the storage system of same producer, like this type selecting of the storage system of user's Disaster Preparation Center has been brought restriction.
(3) based on optical fiber switch: this technology develops, utilize the new function of optical fiber switch, perhaps utilize management software control optical fiber switch, carry out virtual to storage system, management software carries out volume management, rolls up technology such as duplicating, roll up mirror image the virtual memory pond of management then, realizes the remote copy of data.Storag-age is more typically arranged, Falcon etc.
In the remote copy process, guarantee the important method that efficiently provides Network Transmission and protection that valid data duplicate, existing method generally goes up has any data variation will be transferred on the long-range disk simultaneously on the source book.Must cause having a lot of invalid transfer of data like this, for example, have only the variation of 1Byte data in the data of 8K, but existing remote copy technology often needs whole 8K is transmitted, rather than the 1Byte data that change of transmission only.
How therefore a kind of method be provided, on transfer of data, use the residual quantity algorithm that data are carried out the difference transmission, transmit the purpose that minimum data reach remote copy as much as possible, effectively utilizing network bandwidth conserve memory resource is that present data sharply increase the challenge that faces.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of remote copy system and method thereof are provided, and can significantly reduce the data of Network Transmission in the remote copy process, realizes that simplifying of transmission is efficient.
In order to solve the problems of the technologies described above, the invention provides a kind of remote copy method, comprising:
The remote copy transmitting terminal only is sent to described remote copy receiving terminal at the time point of current copy transmissions with respect to its daily record data that changes at the time point of last once copy transmissions with described remote copy transmitting terminal when the remote copy receiving terminal sends Backup Data;
Described remote copy receiving terminal calculates the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions according to the daily record data of described daily record data that changes and the last described remote copy transmitting terminal that calculates thereof, and rebuilds metadata according to this.
Further, said method also can have following characteristics:
Described remote copy transmitting terminal also will be divided into several atomic data pieces in order to the source data zoning of storing described daily record data;
Described remote copy transmitting terminal sends the described daily record data that changes and comprises: its daily record data and its daily record data at the time point of last once copy transmissions at the time point of current copy transmissions is carried out XOR, judge the atomic data piece that changes according to the XOR result, with the XOR result of the described atomic data piece that changes, and the index information of the described atomic data piece that changes is sent to described remote copy receiving terminal; Described index information comprises the piece number of the described atomic data that changes and the time point that changes;
Described remote copy receiving terminal calculates described remote copy transmitting terminal and comprises at the daily record data of the time point of current copy transmissions: according to the index information of the described atomic data piece that changes, find out corresponding atomic data piece in the daily record data of the described remote copy transmitting terminal that its last time calculates, and the XOR result of itself and the described atomic data piece that changes carried out XOR, recover the described atomic data piece that changes, and then the daily record data of the described remote copy transmitting terminal that calculates according to the described atomic data piece that changes and described last time obtains the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions.
Further, said method also can have following characteristics:
Described remote copy transmitting terminal is behind the XOR result who obtains the described atomic data piece that changes, and also the XOR result to the described atomic data piece that changes compresses processing, and then sends it to described remote copy receiving terminal;
Described remote copy receiving terminal carries out decompression earlier behind the XOR result who receives the described atomic data piece that changes, to obtain the XOR result of the described atomic data piece that changes.
Further, said method also can have following characteristics:
Described remote copy transmitting terminal is when the remote copy receiving terminal sends Backup Data, the block address of the Backup Data that sent out of record also, and if transmission occur unusually, when then transmitting once more, begin backup data transmitting from the block address of current record.
Further, said method also can have following characteristics:
Described remote copy transmitting terminal if this locality stores snapshot data, then sends the snapshot time point of described snapshot data correspondence when the remote copy receiving terminal sends Backup Data to described remote copy receiving terminal;
Described remote copy receiving terminal calculates and preserves snapshot data according to the snapshot time point and the described remote copy transmitting terminal of described snapshot data correspondence at the daily record data of the time point of current copy transmissions.
In order to solve the problems of the technologies described above, the present invention also provides a kind of remote copy system, comprises remote copy transmitting terminal and remote copy receiving terminal, wherein:
The remote copy transmitting terminal only is sent to described remote copy receiving terminal at the time point of current copy transmissions with respect to its daily record data that changes at the time point of last once copy transmissions with described remote copy transmitting terminal when the remote copy receiving terminal sends Backup Data;
Described remote copy receiving terminal calculates the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions according to the daily record data of described daily record data that changes and the last described remote copy transmitting terminal that calculates thereof, and rebuilds metadata according to this.
Further, said system also can have following characteristics:
Described remote copy transmitting terminal also will be divided into several atomic data pieces in order to the source data zoning of storing described daily record data;
Described remote copy transmitting terminal sends the described daily record data that changes and comprises: its daily record data and its daily record data at the time point of last once copy transmissions at the time point of current copy transmissions is carried out XOR, judge the atomic data piece that changes according to the XOR result, with the XOR result of the described atomic data piece that changes, and the index information of the described atomic data piece that changes is sent to described remote copy receiving terminal; Described index information comprises the piece number of the described atomic data that changes and the time point that changes;
Described remote copy receiving terminal calculates described remote copy transmitting terminal and comprises at the daily record data of the time point of current copy transmissions: according to the index information of the described atomic data piece that changes, find out corresponding atomic data piece in the daily record data of the described remote copy transmitting terminal that its last time calculates, and the XOR result of itself and the described atomic data piece that changes carried out XOR, recover the described atomic data piece that changes, and then the daily record data of the described remote copy transmitting terminal that calculates according to the described atomic data piece that changes and described last time obtains the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions.
Further, said system also can have following characteristics:
Described remote copy transmitting terminal is behind the XOR result who obtains the described atomic data piece that changes, and also the XOR result to the described atomic data piece that changes compresses processing, and then sends it to described remote copy receiving terminal;
Described remote copy receiving terminal carries out decompression earlier behind the XOR result who receives the described atomic data piece that changes, to obtain the XOR result of the described atomic data piece that changes.
Further, said system also can have following characteristics:
Described remote copy transmitting terminal is when the remote copy receiving terminal sends Backup Data, the block address of the Backup Data that sent out of record also, and if transmission occur unusually, when then transmitting once more, begin backup data transmitting from the block address of current record.
Further, said system also can have following characteristics:
Described remote copy transmitting terminal if this locality stores snapshot data, then sends the snapshot time point of described snapshot data correspondence when the remote copy receiving terminal sends Backup Data to described remote copy receiving terminal;
Described remote copy receiving terminal calculates and preserves snapshot data according to the snapshot time point and the described remote copy transmitting terminal of described snapshot data correspondence at the daily record data of the time point of current copy transmissions.
A kind of remote copy system and the method thereof of confession of the present invention can significantly reduce the data of Network Transmission in the remote copy process, realize that simplifying of transmission is efficient.
Description of drawings
Fig. 1 is a kind of remote copy method flow chart of the embodiment of the invention;
Fig. 2 is a kind of remote copy transmission course of embodiment of the invention schematic diagram;
Fig. 3 is the method schematic diagram that a kind of remote copy transmitting terminal of the embodiment of the invention calculates the daily record data that changes;
Fig. 4 is a kind of remote copy transmission course of application example of the present invention schematic diagram.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is done and to be described in further detail.
Referring to Fig. 1, the figure shows a kind of remote copy method of the embodiment of the invention, comprise step:
Step S101: the remote copy transmitting terminal only is sent to described remote copy receiving terminal at the time point T1 of current copy transmissions with respect to its daily record data that changes at the time point T0 of last once copy transmissions with described remote copy transmitting terminal when the remote copy receiving terminal sends Backup Data;
Step S102: described remote copy receiving terminal calculates the daily record data of described remote copy transmitting terminal at the time point T1 of current copy transmissions according to the daily record data (being the daily record data of described remote copy transmitting terminal at time point T0) of described daily record data that changes and the last described remote copy transmitting terminal that calculates thereof, and rebuilds metadata according to this.
When adopting aforesaid way remote transmission Backup Data, only transmit daily record data, transmission unit data not, and that part of data that the daily record data that is transmitted just changes, and recover the daily record data of remote copy transmitting terminal according to the daily record data that changes at time point T1 by the remote copy receiving terminal, and according to the daily record data reconstruction metadata that recovers at time point T1, rebuild the Network Transmission expense that two aspects have reduced remote copy effectively from network data transmission and metadata dexterously, as shown in Figure 2.
The embodiment of the invention also provides a kind of remote copy transmitting terminal to calculate the method for the daily record data that changes at this, comprising:
Described remote copy transmitting terminal will be divided into several atomic data pieces in order to the source data zoning of storing described daily record data.
Described remote copy transmitting terminal is by carrying out XOR with its daily record data and its daily record data at the time point of last once copy transmissions at the time point of current copy transmissions, judge the atomic data piece that changes according to the XOR result, with the XOR result of the described atomic data piece that changes, and the index information of the described atomic data piece that changes is sent to the daily record data that the mode of described remote copy receiving terminal changes to described remote copy receiving terminal.Wherein, described index information comprises the piece number of the described atomic data that changes and the time point that changes.Referring to Fig. 3, carry out XOR after, if do not change, then the XOR result is 0, if change, then the XOR result is 1, thereby can judge which atomic data piece variation has taken place.
Described remote copy receiving terminal is according to the index information of the described atomic data piece that changes, find out corresponding atomic data piece in the daily record data of the described remote copy transmitting terminal that its last time calculates, and the XOR result of itself and the described atomic data piece that changes carried out XOR, thereby recover the described atomic data piece that changes.Afterwards, the daily record data of the described remote copy receiving terminal described remote copy transmitting terminal that can calculate according to the described atomic data piece that changes and described last time calculates the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions.And described remote copy receiving terminal will be rebuild metadata automatically according to the index information of the described atomic data piece that changes.
In order further to reduce the data of transmission, preferably, described remote copy transmitting terminal can also be behind the XOR result who obtains the described atomic data piece that changes, also the XOR result to the described atomic data piece that changes compresses processing, and then sends it to described remote copy receiving terminal.Can adopt general data compression method such as gzip, 7zip or the like.Especially for the situation that only has less bit to change in the data block that changes, adopt xor operation after, can generate in a large number 0, will reduce these transmission of 0 effectively and carry out squeeze operation, and then save network transmission resource.Correspondingly, described remote copy receiving terminal need carry out decompression earlier behind the XOR result who receives the described atomic data piece that changes, to obtain the XOR result of the described atomic data piece that changes.
Mainly need to consider abnormality processing in the process of remote copy, mainly consider two kinds of situations: a kind of is that client and distance host are unusual; A kind of is that network is unusual.Therefore, preferably, described remote copy transmitting terminal is when the remote copy receiving terminal sends Backup Data, can also write down the block address of the Backup Data that has sent out, if and transmission occurs unusually, when then transmitting once more, begin backup data transmitting from the block address of current record.
Consider that the remote copy transmitting terminal may have snapshot functions, then when carrying out remote copy, also needs snapshot data is backed up to the remote copy receiving terminal.In order effectively to reduce the snapshot data that needs transmission, preferably, described remote copy transmitting terminal can if this locality stores snapshot data, then send the snapshot time point of described snapshot data correspondence when the remote copy receiving terminal sends Backup Data to described remote copy receiving terminal.Described remote copy receiving terminal calculates and the preservation snapshot data at the daily record data of the time point of current copy transmissions according to the snapshot time point and the described remote copy transmitting terminal of described snapshot data correspondence, thereby saves network transmission resource effectively.
The present invention can be applied to the remote copy client to remote copy server backup data, also can be applied to carry out between the continuous data protection server data backup.That is, described remote copy transmitting terminal is the remote copy client, and described remote copy receiving terminal is the remote copy server.Perhaps, described remote copy transmitting terminal and described remote copy receiving terminal are continuous data protection system.Consider for compatibility, preferably, when the receiving terminal of remote copy described in the embodiment of the invention is carried out the metadata reconstruction, comprise the index of rebuilding the daily record data that changes, can adopt with the metadata of continuous data protection and organize the identical mode of way to manage.
In order to further specify the advantage of the inventive method, describe with an application example below.
Application example
As shown in Figure 4, what the remote copy transmitting terminal changed with respect to its daily record data at time point T0 at the daily record data of time point T1 is atomic data piece 2,6,7, adopt the present invention program, only need be with the data that change, it is atomic data piece 2,6,7, be sent to the remote copy receiving terminal, and the data that the described remote copy transmitting terminal copy backup that is calculated according to the described data that change and described remote copy receiving terminal last time by described remote copy receiving terminal comes, it is the daily record data of time point T0, recover the daily record data of time point T1, and rebuild metadata automatically.In the whole copy backup process, only need transmit the data that change, save network transmission resource greatly at network side.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. remote copy method is characterized in that:
The remote copy transmitting terminal only is sent to described remote copy receiving terminal at the time point of current copy transmissions with respect to its daily record data that changes at the time point of last once copy transmissions with described remote copy transmitting terminal when the remote copy receiving terminal sends Backup Data;
Described remote copy receiving terminal calculates the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions according to the daily record data of described daily record data that changes and the last described remote copy transmitting terminal that calculates thereof, and rebuilds metadata according to this.
2. the method for claim 1 is characterized in that:
Described remote copy transmitting terminal also will be divided into several atomic data pieces in order to the source data zoning of storing described daily record data;
Described remote copy transmitting terminal sends the described daily record data that changes and comprises: its daily record data and its daily record data at the time point of last once copy transmissions at the time point of current copy transmissions is carried out XOR, judge the atomic data piece that changes according to the XOR result, with the XOR result of the described atomic data piece that changes, and the index information of the described atomic data piece that changes is sent to described remote copy receiving terminal; Described index information comprises the piece number of the described atomic data that changes and the time point that changes;
Described remote copy receiving terminal calculates described remote copy transmitting terminal and comprises at the daily record data of the time point of current copy transmissions: according to the index information of the described atomic data piece that changes, find out corresponding atomic data piece in the daily record data of the described remote copy transmitting terminal that its last time calculates, and the XOR result of itself and the described atomic data piece that changes carried out XOR, recover the described atomic data piece that changes, and then the daily record data of the described remote copy transmitting terminal that calculates according to the described atomic data piece that changes and described last time obtains the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions.
3. method as claimed in claim 2 is characterized in that:
Described remote copy transmitting terminal is behind the XOR result who obtains the described atomic data piece that changes, and also the XOR result to the described atomic data piece that changes compresses processing, and then sends it to described remote copy receiving terminal;
Described remote copy receiving terminal carries out decompression earlier behind the XOR result who receives the described atomic data piece that changes, to obtain the XOR result of the described atomic data piece that changes.
4. as any one described method among the claim 1-3, it is characterized in that:
Described remote copy transmitting terminal is when the remote copy receiving terminal sends Backup Data, the block address of the Backup Data that sent out of record also, and if transmission occur unusually, when then transmitting once more, begin backup data transmitting from the block address of current record.
5. as any one described method among the claim 1-3, it is characterized in that:
Described remote copy transmitting terminal if this locality stores snapshot data, then sends the snapshot time point of described snapshot data correspondence when the remote copy receiving terminal sends Backup Data to described remote copy receiving terminal;
Described remote copy receiving terminal calculates and preserves snapshot data according to the snapshot time point and the described remote copy transmitting terminal of described snapshot data correspondence at the daily record data of the time point of current copy transmissions.
6. a remote copy system comprises remote copy transmitting terminal and remote copy receiving terminal, it is characterized in that:
The remote copy transmitting terminal only is sent to described remote copy receiving terminal at the time point of current copy transmissions with respect to its daily record data that changes at the time point of last once copy transmissions with described remote copy transmitting terminal when the remote copy receiving terminal sends Backup Data;
Described remote copy receiving terminal calculates the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions according to the daily record data of described daily record data that changes and the last described remote copy transmitting terminal that calculates thereof, and rebuilds metadata according to this.
7. system as claimed in claim 6 is characterized in that:
Described remote copy transmitting terminal also will be divided into several atomic data pieces in order to the source data zoning of storing described daily record data;
Described remote copy transmitting terminal sends the described daily record data that changes and comprises: its daily record data and its daily record data at the time point of last once copy transmissions at the time point of current copy transmissions is carried out XOR, judge the atomic data piece that changes according to the XOR result, with the XOR result of the described atomic data piece that changes, and the index information of the described atomic data piece that changes is sent to described remote copy receiving terminal; Described index information comprises the piece number of the described atomic data that changes and the time point that changes;
Described remote copy receiving terminal calculates described remote copy transmitting terminal and comprises at the daily record data of the time point of current copy transmissions: according to the index information of the described atomic data piece that changes, find out corresponding atomic data piece in the daily record data of the described remote copy transmitting terminal that its last time calculates, and the XOR result of itself and the described atomic data piece that changes carried out XOR, recover the described atomic data piece that changes, and then the daily record data of the described remote copy transmitting terminal that calculates according to the described atomic data piece that changes and described last time obtains the daily record data of described remote copy transmitting terminal at the time point of current copy transmissions.
8. system as claimed in claim 7 is characterized in that:
Described remote copy transmitting terminal is behind the XOR result who obtains the described atomic data piece that changes, and also the XOR result to the described atomic data piece that changes compresses processing, and then sends it to described remote copy receiving terminal;
Described remote copy receiving terminal carries out decompression earlier behind the XOR result who receives the described atomic data piece that changes, to obtain the XOR result of the described atomic data piece that changes.
9. as any one described system among the claim 6-8, it is characterized in that:
Described remote copy transmitting terminal is when the remote copy receiving terminal sends Backup Data, the block address of the Backup Data that sent out of record also, and if transmission occur unusually, when then transmitting once more, begin backup data transmitting from the block address of current record.
10. as any one described system among the claim 6-8, it is characterized in that:
Described remote copy transmitting terminal if this locality stores snapshot data, then sends the snapshot time point of described snapshot data correspondence when the remote copy receiving terminal sends Backup Data to described remote copy receiving terminal;
Described remote copy receiving terminal calculates and preserves snapshot data according to the snapshot time point and the described remote copy transmitting terminal of described snapshot data correspondence at the daily record data of the time point of current copy transmissions.
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| CN102761615A (en) * | 2012-06-29 | 2012-10-31 | 浪潮(北京)电子信息产业有限公司 | Method and device for realizing data synchronism of long-distance duplication system |
| CN103049350A (en) * | 2012-12-06 | 2013-04-17 | 浪潮(北京)电子信息产业有限公司 | Synchronous initializing method and device for remote replication system mirrored volume |
| CN103366106A (en) * | 2013-06-21 | 2013-10-23 | 国家电网公司 | Client-side safety monitoring method for remote data recovery system |
| CN103618765A (en) * | 2013-11-11 | 2014-03-05 | 华为技术有限公司 | Remote copying method and device, backup terminal device and system |
| CN103678039A (en) * | 2013-12-05 | 2014-03-26 | 华为技术有限公司 | Data recovery method and device |
| CN103744751A (en) * | 2014-02-08 | 2014-04-23 | 安徽瀚科信息科技有限公司 | Storage device configuration information continuous optimization backup system and application method thereof |
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| CN104239538A (en) * | 2014-09-22 | 2014-12-24 | 北京国双科技有限公司 | Method, system and device for compressing snapshot log |
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| CN105278522A (en) * | 2015-10-16 | 2016-01-27 | 浪潮(北京)电子信息产业有限公司 | Remote replication method and system |
| CN105404564A (en) * | 2015-12-16 | 2016-03-16 | 浪潮(北京)电子信息产业有限公司 | Data remote disaster tolerance method and apparatus |
| CN105657473A (en) * | 2015-11-25 | 2016-06-08 | 乐视云计算有限公司 | Data processing method and device |
| CN103678039B (en) * | 2013-12-05 | 2016-11-30 | 华为技术有限公司 | Data reconstruction method and equipment |
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