CN112000279A - Data volume synchronization method, device and medium - Google Patents
Data volume synchronization method, device and medium Download PDFInfo
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- CN112000279A CN112000279A CN202010745177.XA CN202010745177A CN112000279A CN 112000279 A CN112000279 A CN 112000279A CN 202010745177 A CN202010745177 A CN 202010745177A CN 112000279 A CN112000279 A CN 112000279A
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
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Abstract
The embodiment of the invention discloses a data volume synchronization method, a data volume synchronization device and a computer readable storage medium, wherein when the initialization synchronization of a data volume is started, whether synchronous IO data meet the preset zero data requirement is judged; when the synchronous IO data meets the preset zero data requirement, it indicates that a large amount of blank data exists in the data to be synchronized, and at this time, it may be further determined whether the auxiliary volume is a self-compaction volume. Because the storage space allocated by the self-compaction volume is limited, in order to avoid excessive occupation of bandwidth resources and storage space, when the auxiliary volume is the self-compaction volume, the synchronous IO data can be replaced by target IO data which does not carry zero data, and the initialization synchronization of the main volume and the auxiliary volume is realized by using the target IO data, so that the bandwidth occupied by the data volume during synchronization is effectively reduced.
Description
Technical Field
The present invention relates to the field of storage system technologies, and in particular, to a method and an apparatus for synchronizing data volumes, and a computer-readable storage medium.
Background
Data volumes in a storage system are classified into standard volumes and thin volumes. The storage space of a volume needs to be specified when the volume is created, wherein the standard volume is allocated the specified storage space in full when the volume is created. And when the volume is created, the self-compaction volume only allocates part of the storage space, and when the stored data capacity is larger than the storage space, more storage space is dynamically allocated until the specified storage space is occupied.
Remote copy relationships define the relationship between volumes, typically one volume designated as a primary volume and the other as a secondary volume. When the remote copy relationship is just created, the data of the secondary volume and the primary volume are inconsistent, and the remote copy relationship is in an inconsistent stop state. When the remote copy relationship is started, the data of the primary volume needs to be synchronized to the secondary volume, the synchronization process is initialization synchronization, and the remote copy relationship for initialization synchronization is in an inconsistent copy state. In a conventional method, all data in a primary volume needs to be completely synchronized to a secondary volume in an initialization synchronization process, and for blank data in the primary volume to be transmitted to the secondary volume as synchronization data in a manner of filling 0, the data transmission method needs to occupy a large bandwidth.
Therefore, how to reduce the bandwidth occupied by the data volume synchronization is a problem to be solved by those skilled in the art.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for synchronizing data volumes, and a computer-readable storage medium, which can reduce bandwidth occupied by data volume synchronization.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for synchronizing data volumes, including:
when the initialization synchronization of the data volume is started, judging whether the synchronous IO data meets the preset zero data requirement or not;
when the synchronous IO data meet the preset zero data requirement, judging whether the auxiliary volume is a self-compaction volume or not;
and when the auxiliary volume is a self-compaction volume, replacing the synchronous IO data with target IO data which does not carry zero data, and realizing the initialization synchronization of the main volume and the auxiliary volume by using the target IO data.
Optionally, the determining whether the synchronous IO data meets a preset zero data requirement includes:
judging whether the synchronous IO data is all-zero data;
and when the synchronous IO data is all zero data, executing the step of judging whether the auxiliary volume is a self-compaction volume.
Optionally, the replacing the synchronized IO data with target IO data that does not carry zero data, and implementing initialization synchronization of the primary volume and the secondary volume by using the target IO data includes:
determining position information corresponding to the synchronous IO data according to bitmap information;
and transmitting the position information serving as target IO data to the auxiliary volume so that the auxiliary volume sets the data corresponding to the position information to zero.
Optionally, the determining whether the synchronous IO data meets a preset zero data requirement includes:
judging whether the proportion of all-zero data in the synchronous IO data exceeds a preset limit value or not;
and when the proportion of all-zero data in the synchronous IO data exceeds a preset limit value, executing the step of judging whether the auxiliary volume is a self-compaction volume.
Optionally, the replacing the synchronized IO data with target IO data that does not carry zero data, and implementing initialization synchronization of the primary volume and the secondary volume by using the target IO data includes:
determining position information corresponding to all-zero data in the synchronous IO data according to bitmap information;
and transmitting the position information and non-zero data in the synchronous IO data to the auxiliary volume as target IO data so that the auxiliary volume sets zero of the data corresponding to the position information and stores the non-zero data to a corresponding position.
The embodiment of the invention also provides a data volume synchronization device, which comprises a first judgment unit, a second judgment unit and a replacement unit;
the first judging unit is used for judging whether synchronous IO data meet a preset zero data requirement when the initialization synchronization of the data volume is started;
the second judging unit is configured to judge whether the auxiliary volume is a self-compaction volume when the synchronous IO data meets a preset zero data requirement;
and the replacing unit is used for replacing the synchronous IO data with target IO data which does not carry zero data when the auxiliary volume is a self-compaction volume, and realizing the initialization synchronization of the main volume and the auxiliary volume by using the target IO data.
Optionally, the first determining unit is specifically configured to determine whether the synchronous IO data is all-zero data; and when the synchronous IO data is all-zero data, triggering the second judgment unit.
Optionally, the replacing unit is specifically configured to determine, according to bitmap information, location information corresponding to the synchronous IO data; and transmitting the position information serving as target IO data to the auxiliary volume so that the auxiliary volume sets the data corresponding to the position information to zero.
Optionally, the first determining unit is specifically configured to determine whether a ratio of all-zero data in the synchronous IO data exceeds a preset limit; and when the proportion of all-zero data in the synchronous IO data exceeds a preset limit value, triggering the second judgment unit.
Optionally, the replacing unit is specifically configured to determine, according to bitmap information, position information corresponding to all-zero data in the synchronous IO data; and transmitting the position information and non-zero data in the synchronous IO data to the auxiliary volume as target IO data so that the auxiliary volume sets zero of the data corresponding to the position information and stores the non-zero data to a corresponding position.
An embodiment of the present invention further provides a synchronization apparatus for a data volume, including:
a memory for storing a computer program;
a processor for executing said computer program to implement the steps of the method for synchronization of data volumes as described in any of the above.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the steps of the data volume synchronization method according to any one of the above items.
According to the technical scheme, when the initialization synchronization of the data volume is started, whether the synchronous IO data meets the preset zero data requirement is judged; when the synchronous IO data meets the preset zero data requirement, it indicates that a large amount of blank data exists in the data to be synchronized, and at this time, it may be further determined whether the auxiliary volume is a self-compaction volume. Because the storage space allocated by the self-compaction volume is limited, in order to avoid excessive occupation of bandwidth resources and storage space, when the auxiliary volume is the self-compaction volume, the synchronous IO data can be replaced by target IO data which does not carry zero data, and the initialization synchronization of the main volume and the auxiliary volume is realized by using the target IO data, so that the bandwidth occupied by the data volume during synchronization is effectively reduced.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a flowchart of a method for synchronizing data volumes according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a synchronization apparatus for data volumes according to an embodiment of the present invention;
fig. 3 is a schematic hardware structure diagram of a synchronization apparatus for data volumes according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Next, a method for synchronizing data volumes according to an embodiment of the present invention will be described in detail. Fig. 1 is a flowchart of a method for synchronizing data volumes according to an embodiment of the present invention, where the method includes:
s101: when the initialization synchronization of the data volume is started, whether the synchronous IO data meets the preset zero data requirement is judged.
The synchronous IO data refers to data which needs to be synchronized to the secondary volume by the primary volume in the process of initializing synchronization.
The data formatted by the newly created data volume is often blank data and does not contain specific data information. In the conventional method, when the synchronization is initialized, blank data needs to be filled with all-zero data, so that the all-zero data is sent to the auxiliary volume to realize the data synchronization of the main volume and the auxiliary volume. However, transmission of all-zero data also occupies a large bandwidth, and therefore, in the embodiment of the present invention, when the data volume is initialized to be synchronized, it can be determined whether the synchronized IO data meets the preset zero data requirement.
The zero data requirement may be that the synchronous IO data is all-zero data or that a proportion of all-zero data in the synchronous IO data exceeds a preset limit.
The value of the preset limit value can be set according to actual requirements, for example, the preset limit value can be set to 95%.
When the synchronous IO data meets the preset zero data requirement, it indicates that there is a large amount of blank data in the data to be synchronized, and at this time, it may be further determined whether the auxiliary volume is a self-compaction volume, that is, S102 is performed.
S102: and judging whether the auxiliary volume is a self-compaction volume or not.
The storage space allocated due to the self-compaction volume is limited. When the auxiliary volume is a self-compaction volume, according to a traditional data synchronization mode, an additional storage space needs to be allocated for the auxiliary volume to store the synchronized IO data transmitted by the main volume.
However, when the synchronous IO data meets the preset zero data requirement, the main volume synchronizes all-zero data to the auxiliary volume, which not only causes waste of storage resources, but also occupies more bandwidth resources, and therefore, in the embodiment of the present invention, when the auxiliary volume is a self-compaction volume, the IO data that needs to be synchronized may be converted, that is, S103 is executed.
S103: and replacing the synchronous IO data with target IO data which does not carry zero data, and realizing the initialization synchronization of the main volume and the auxiliary volume by utilizing the target IO data.
When the synchronous IO data is all-zero data, the position information corresponding to the synchronous IO data can be determined according to the bitmap information; and transmitting the position information as target IO data to the auxiliary volume so that the auxiliary volume can set the data corresponding to the position information to zero.
The bitmap information is used to characterize the location corresponding to each data stored in the data volume.
For example, when the synchronous IO data includes 100 pieces of data, assuming that the initial position of data storage is 1, the position information corresponding to the 100 pieces of data is 1 to 100 in a sequential storage manner. When 100 pieces of data are all-zero data, the 100 pieces of all-zero data do not need to be transmitted to the auxiliary volume at this time, and only the information of the position 1-100 needs to be transmitted to the auxiliary volume, so that the system can set the data corresponding to the 100 storage positions 1-100 in the auxiliary volume as zero.
When the proportion of all-zero data in the synchronous IO data exceeds a preset limit value, determining position information corresponding to all-zero data in the synchronous IO data according to the bitmap information; and transmitting the position information and non-zero data in the synchronous IO data as target IO data to the auxiliary volume so that the auxiliary volume can set the data corresponding to the position information to zero and store the non-zero data to a corresponding position.
For example, when the synchronous IO data includes 100 pieces of data, assuming that the initial position of data storage is 1, the position information corresponding to the 100 pieces of data is 1 to 100 in a sequential storage manner. When the first 5 pieces of data in 100 pieces of data have corresponding data information and the remaining 95 pieces of data are all zero data, the position information corresponding to the remaining 95 pieces of data is 6-100, and at this time, as long as the data information corresponding to the first 5 pieces of data and the position information of 6-100 are transmitted to the auxiliary volume, the system can set the first 5 pieces of data in the auxiliary volume as the received data information, and set the data corresponding to the 95 storage positions of 6-100 as zero.
In the embodiment of the present invention, when the synchronous IO data does not meet the preset zero data requirement or the auxiliary volume is not a self-compaction volume, the synchronous IO data may be transmitted to the auxiliary volume in a conventional data synchronization manner.
According to the technical scheme, when the initialization synchronization of the data volume is started, whether the synchronous IO data meets the preset zero data requirement is judged; when the synchronous IO data meets the preset zero data requirement, it indicates that a large amount of blank data exists in the data to be synchronized, and at this time, it may be further determined whether the auxiliary volume is a self-compaction volume. Because the storage space allocated by the self-compaction volume is limited, in order to avoid excessive occupation of bandwidth resources and storage space, when the auxiliary volume is the self-compaction volume, the synchronous IO data can be replaced by target IO data which does not carry zero data, and the initialization synchronization of the main volume and the auxiliary volume is realized by using the target IO data, so that the bandwidth occupied by the data volume during synchronization is effectively reduced.
Fig. 2 is a schematic structural diagram of a data volume synchronization apparatus according to an embodiment of the present invention, including a first determining unit 21, a second determining unit 22, and a replacing unit 23;
a first judging unit 21, configured to, when initiating initialization synchronization of a data volume, judge whether synchronous IO data meets a preset zero data requirement;
the second judging unit 22 is configured to, when the synchronous IO data meets a preset zero data requirement, judge whether the auxiliary volume is a self-compaction volume;
the replacing unit 23 is configured to, when the auxiliary volume is a self-compaction volume, replace the synchronous IO data with target IO data that does not carry zero data, and implement initialization synchronization of the main volume and the auxiliary volume by using the target IO data.
Optionally, the first determining unit is specifically configured to determine whether the synchronous IO data is all-zero data; and when the synchronous IO data is all-zero data, triggering a second judgment unit.
Optionally, the replacing unit is specifically configured to determine, according to the bitmap information, position information corresponding to the synchronous IO data; and transmitting the position information as target IO data to the auxiliary volume so that the auxiliary volume can set the data corresponding to the position information to zero.
Optionally, the first determining unit is specifically configured to determine whether a ratio of all-zero data in the synchronous IO data exceeds a preset limit; and when the proportion of all-zero data in the synchronous IO data exceeds a preset limit value, triggering a second judgment unit.
Optionally, the replacing unit is specifically configured to determine, according to the bitmap information, position information corresponding to all-zero data in the synchronous IO data; and transmitting the position information and non-zero data in the synchronous IO data as target IO data to the auxiliary volume so that the auxiliary volume can set the data corresponding to the position information to zero and store the non-zero data to a corresponding position.
The description of the features in the embodiment corresponding to fig. 2 may refer to the related description of the embodiment corresponding to fig. 1, and is not repeated here.
According to the technical scheme, when the initialization synchronization of the data volume is started, whether the synchronous IO data meets the preset zero data requirement is judged; when the synchronous IO data meets the preset zero data requirement, it indicates that a large amount of blank data exists in the data to be synchronized, and at this time, it may be further determined whether the auxiliary volume is a self-compaction volume. Because the storage space allocated by the self-compaction volume is limited, in order to avoid excessive occupation of bandwidth resources and storage space, when the auxiliary volume is the self-compaction volume, the synchronous IO data can be replaced by target IO data which does not carry zero data, and the initialization synchronization of the main volume and the auxiliary volume is realized by using the target IO data, so that the bandwidth occupied by the data volume during synchronization is effectively reduced.
Fig. 3 is a schematic hardware structure diagram of a synchronization apparatus 30 for data volumes according to an embodiment of the present invention, including:
a memory 31 for storing a computer program;
a processor 32 for executing a computer program for implementing the steps of the method for synchronizing data volumes as described in any of the embodiments above.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for synchronizing data volumes according to any of the above embodiments are implemented.
The above provides a method, an apparatus and a computer-readable storage medium for synchronizing data volumes according to embodiments of the present invention. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Claims (10)
1. A method for synchronizing data volumes, comprising:
when the initialization synchronization of the data volume is started, judging whether the synchronous IO data meets the preset zero data requirement or not;
when the synchronous IO data meet the preset zero data requirement, judging whether the auxiliary volume is a self-compaction volume or not;
and when the auxiliary volume is a self-compaction volume, replacing the synchronous IO data with target IO data which does not carry zero data, and realizing the initialization synchronization of the main volume and the auxiliary volume by using the target IO data.
2. The method according to claim 1, wherein the determining whether the IO data satisfy a preset zero data requirement includes:
judging whether the synchronous IO data is all-zero data;
and when the synchronous IO data is all zero data, executing the step of judging whether the auxiliary volume is a self-compaction volume.
3. The method according to claim 2, wherein the replacing the synchronized IO data with target IO data that does not carry zero data, and the implementing of the initialization synchronization of the primary volume and the secondary volume by using the target IO data includes:
determining position information corresponding to the synchronous IO data according to bitmap information;
and transmitting the position information serving as target IO data to the auxiliary volume so that the auxiliary volume sets the data corresponding to the position information to zero.
4. The method according to claim 1, wherein the determining whether the IO data satisfy a preset zero data requirement includes:
judging whether the proportion of all-zero data in the synchronous IO data exceeds a preset limit value or not;
and when the proportion of all-zero data in the synchronous IO data exceeds a preset limit value, executing the step of judging whether the auxiliary volume is a self-compaction volume.
5. The method according to claim 4, wherein the replacing the synchronized IO data with target IO data that does not carry zero data, and the implementing of the initialization synchronization of the primary volume and the secondary volume by using the target IO data includes:
determining position information corresponding to all-zero data in the synchronous IO data according to bitmap information;
and transmitting the position information and non-zero data in the synchronous IO data to the auxiliary volume as target IO data so that the auxiliary volume sets zero of the data corresponding to the position information and stores the non-zero data to a corresponding position.
6. A data volume synchronization device is characterized by comprising a first judgment unit, a second judgment unit and a replacement unit;
the first judging unit is used for judging whether synchronous IO data meet a preset zero data requirement when the initialization synchronization of the data volume is started;
the second judging unit is configured to judge whether the auxiliary volume is a self-compaction volume when the synchronous IO data meets a preset zero data requirement;
and the replacing unit is used for replacing the synchronous IO data with target IO data which does not carry zero data when the auxiliary volume is a self-compaction volume, and realizing the initialization synchronization of the main volume and the auxiliary volume by using the target IO data.
7. The apparatus according to claim 6, wherein the first determining unit is specifically configured to determine whether the IO data is all-zero data; and when the synchronous IO data is all-zero data, triggering the second judgment unit.
8. The apparatus according to claim 7, wherein the replacement unit is specifically configured to determine, according to bitmap information, location information corresponding to the synchronous IO data; and transmitting the position information serving as target IO data to the auxiliary volume so that the auxiliary volume sets the data corresponding to the position information to zero.
9. A synchronization apparatus for a data volume, comprising:
a memory for storing a computer program;
processor for executing said computer program for carrying out the steps of the method for synchronizing data volumes according to any one of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for synchronizing data volumes according to any one of claims 1 to 5.
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