CN111984469A - Incremental snapshot capacity expansion method and device - Google Patents
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- 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
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- 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
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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 invention discloses an incremental snapshot capacity expansion method, which comprises the following steps: closing input and output between the host and the source volume, and judging whether the residual capacity space of the first storage pool where the target volume is located meets the capacity expansion of the preset capacity; if yes, applying for a virtual capacity expansion space with preset capacity from the first storage pool through the target volume; judging whether the residual capacity space of the second storage pool where the source volume is located meets the capacity expansion of the preset capacity; if yes, applying for actual expansion space with preset capacity from the second storage pool through the source volume; calculating the size of the required bitmap space according to the preset capacity, and judging whether the residual space of the bitmap space can meet the size of the required bitmap space; and if so, configuring bitmap information, updating the snapshot progress according to the bitmap information, feeding back successful capacity expansion information and recovering the input and output of the host. The invention also discloses a corresponding device. The invention can carry out volume expansion operation on the premise of not disconnecting the incremental snapshot relation.
Description
Technical Field
The present invention relates to the field of network storage technologies, and in particular, to a method and an apparatus for expanding an incremental snapshot.
Background
Snapshot is a point-in-time based data protection technique. When a snapshot is created for a volume, the target volume in the snapshot relationship has the same data in the source volume at the time the snapshot was created. When the data of the source volume is modified, the data in the target volume still remains unchanged, so that the purpose of protecting the data is achieved. The snapshots are divided into normal snapshots and incremental snapshots according to the number of data copies. After the common snapshot is started each time, all data of the source volume are copied to the target volume; and the incremental snapshot only copies all data to the target volume after the first startup, and then starts the snapshot again, only copies the data changed in the current startup and last startup time period to the target volume, so that the bandwidth is saved, and the system pressure is reduced.
The volume capacity expansion technology can increase the capacity of an existing volume, thereby achieving the purpose of storing more data.
A prerequisite for a snapshot relationship to be created between two volumes is that the capacities of the two volumes must be equally large. After the snapshot relationship is created, the storage system generates a split bitmap for managing the snapshot relationship, and if the snapshot is an incremental snapshot, additionally generates a difference bitmap, the volume expansion operation cannot be executed by either the source volume or the target volume, because once the capacity of one or two volumes changes, the excessive areas are not managed by corresponding bitmaps, so that the phenomenon of data inconsistency occurs, if the volume expansion is to be realized, the snapshot relation must be disconnected first, the operation is not only complicated, but also the result of inconsistent data can occur if the snapshot relationship is disconnected when the snapshot progress is not completed.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide an incremental snapshot capacity expansion technique, which can perform a volume capacity expansion operation without breaking a snapshot relationship.
Based on the above object, an aspect of the present invention provides an incremental snapshot capacity expansion method, where the method includes:
closing input and output between the host and the source volume, and judging whether the residual capacity space of the first storage pool where the target volume is located meets the capacity expansion of the preset capacity;
responding to the fact that the remaining capacity space of the first storage pool meets the capacity required by capacity expansion, and applying a virtual capacity expansion space with preset capacity to the first storage pool through the target volume;
judging whether the residual capacity space of the second storage pool where the source volume is located meets the capacity expansion of the preset capacity;
responding to the fact that the remaining capacity space of the second storage pool meets the capacity required by capacity expansion, and applying actual capacity expansion space with preset capacity to the second storage pool through the source volume;
calculating the size of the required bitmap space according to the preset capacity, and judging whether the residual space of the bitmap space can meet the size of the required bitmap space;
and responding to the fact that the residual space of the bitmap space meets the size of the needed bitmap space, configuring bitmap information, updating the snapshot progress according to the bitmap information, feeding back successful capacity expansion information and recovering input and output of the host.
In some embodiments of the incremental snapshot capacity expansion method of the present invention, calculating the size of the bitmap space according to the preset capacity, and determining whether the remaining space of the bitmap space can satisfy the size of the bitmap space further includes:
and calculating the sizes of the required split bitmap and the difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
In some embodiments of the incremental snapshot capacity expansion method of the present invention, in response to the remaining space of the bitmap space satisfying the size of the bitmap space, configuring bitmap information and updating the snapshot progress according to the bitmap information further includes:
and in response to the bitmap space meeting the sizes of the split bitmap and the difference bitmap, configuring all the split bitmaps into a copied state and configuring all the difference bitmaps into a to-be-copied state.
In some embodiments of the incremental snapshot capacity expansion method of the present invention, determining whether a remaining capacity space of the first storage pool where the target volume is located meets capacity expansion of a preset capacity further includes:
judging whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool or not;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is larger than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of a preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
In some embodiments of the method for expanding an incremental snapshot according to the present invention, the method further includes:
and responding to the situation that the residual capacity space of the first storage pool does not meet the capacity required by capacity expansion, ending the capacity expansion process, feeding back capacity expansion failure information and recovering the input and output of the source volume and the host.
In some embodiments of the method for expanding an incremental snapshot according to the present invention, the method further includes:
and in response to that the remaining capacity space of the second storage pool does not meet the capacity required for capacity expansion, performing capacity reduction operation on the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
In some embodiments of the method for expanding an incremental snapshot according to the present invention, the method further includes:
and in response to that the residual space of the bitmap space does not meet the size of the required bitmap space, performing capacity reduction operation on the expanded source volume and the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
In another aspect of the embodiments of the present invention, an incremental snapshot capacity expansion apparatus is further provided, where the apparatus includes:
the target volume expansion space judgment module is configured to close input and output between the host and the source volume and judge whether the residual capacity space of the first storage pool where the target volume is located meets the expansion of the preset capacity;
the target volume capacity expansion space application module is configured to respond that the remaining capacity space of the first storage pool meets the capacity required by capacity expansion, and apply a virtual capacity expansion space with preset capacity to the first storage pool through the target volume;
the source volume expansion space judgment module is configured to judge whether the residual capacity space of the second storage pool where the source volume is located meets the expansion of the preset capacity;
the source volume expansion space application module is configured to respond that the remaining capacity space of the second storage pool meets the capacity required by expansion, and apply for an actual expansion space with preset capacity to the second storage pool through the source volume;
the bitmap expansion space judgment module is configured to calculate the size of the required bitmap space according to the preset capacity and judge whether the residual space of the bitmap space can meet the size of the required bitmap space;
and the bitmap expansion space application module is configured to respond that the residual space of the bitmap space meets the size of the required bitmap space, configure bitmap information, update the snapshot progress according to the bitmap information, feed back successful expansion information and recover the input and the output of the host.
In some embodiments of the incremental snapshot capacity expansion apparatus according to the present invention, the bitmap capacity expansion space determination module is further configured to:
and calculating the sizes of the required split bitmap and the difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
In some embodiments of the incremental snapshot capacity expansion apparatus according to the present invention, the target volume capacity expansion space determination module is further configured to:
judging whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool or not;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is larger than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of a preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
The invention has at least the following beneficial technical effects: the capacity expansion operation can be performed on the source volume without disconnecting the snapshot relationship. Therefore, the data consistency of the snapshot is not damaged. Meanwhile, after the capacity expansion operation is completed, the capacity of the source volume is still consistent with that of the target volume, so that the user can directly restart the snapshot when needed, and the source volume does not need to be matched with the target volume with the same capacity.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a schematic block diagram illustrating an embodiment of an incremental snapshot capacity expansion method in accordance with the present invention;
FIG. 2 is a schematic block diagram illustrating an embodiment of an incremental snapshot volume expansion device in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of description and should not be construed as limiting the embodiments of the present invention, and the descriptions thereof in the following embodiments are omitted.
Based on the foregoing objective and a first aspect of the embodiments of the present invention, an embodiment of an incremental snapshot capacity expansion method is provided. FIG. 1 is a schematic block diagram illustrating an embodiment of an incremental snapshot capacity expansion method according to the present invention. In the embodiment shown in fig. 1, the method comprises at least the following steps:
s100, closing input and output between a host and a source volume, and judging whether the residual capacity space of a first storage pool where a target volume is located meets the capacity expansion of preset capacity;
s200, responding to the situation that the residual capacity space of the first storage pool meets the capacity required by capacity expansion, and applying a virtual capacity expansion space with preset capacity to the first storage pool through the target volume;
s300, judging whether the residual capacity space of the second storage pool where the source volume is located meets the capacity expansion of the preset capacity;
s400, responding to the fact that the remaining capacity space of the second storage pool meets the capacity required by capacity expansion, and applying for an actual capacity expansion space with preset capacity from the second storage pool through a source volume;
s500, calculating the size of the required bitmap space according to the preset capacity, and judging whether the residual space of the bitmap space can meet the size of the required bitmap space;
s600, responding to the fact that the residual space of the bitmap space meets the size of the needed bitmap space, configuring bitmap information, updating the snapshot progress according to the bitmap information, feeding back successful capacity expansion information and recovering input and output of the host.
In some embodiments of the present invention, by specifying the expansion order of the source volume, the target volume, and the bitmap, and performing state processing after expansion, it is ensured that the function of expanding the volume of the source volume can be realized without breaking the incremental snapshot relationship, and the data consistency of the incremental snapshot can be ensured. After the capacity expansion of the source volume is completed, the snapshot can be restarted, and the problem that the snapshot cannot be restarted due to the fact that the capacities of the source volume and the target volume are inconsistent does not occur.
In some embodiments of the present invention, assuming that the original capacity of the source volume is c and the capacity to be expanded is x, the snapshot source volume performs the capacity expansion operation as follows: if the source volume has host IO (input/output), suspending the host IO; the target volume queries the first storage pool where it is located whether the capacity remaining in the first storage pool is sufficient. And if the first storage pool capacity meets the requirement, executing the next step, namely the target volume additionally applies for the virtual capacity with the capacity of x to the first storage pool. The virtual capacity, i.e., the space of the capacity x, is not actually allocated, and only when the target volume is to use the space, the capacity is actually allocated. The source volume queries the second storage pool where it is located whether the capacity remaining in the second storage pool is sufficient. The remaining capacity of the second storage pool should be greater than x. If the second storage pool capacity meets the requirement, the next step is executed, namely the source volume applies for the actual capacity with the capacity x to the second storage pool, and the formatting operation is carried out on the capacity space. The size of the required bitmap is calculated from the capacity x. And if the bitmap space capacity meets the requirement, executing the next step, namely configuring bitmap information, updating the snapshot progress according to the bitmap information, feeding back successful capacity expansion information and recovering the input and output of the host. After the capacity of the source volume is expanded, the capacity of the source volume is kept consistent with the capacity of the target volume. When the user starts the snapshot again, the capacity of the source volume is the same as that of the target volume, so that the snapshot can be started normally.
According to some embodiments of the incremental snapshot capacity expansion method of the present invention, calculating the size of the bitmap space according to the preset capacity, and determining whether the remaining space of the bitmap space can satisfy the size of the bitmap space further includes:
and calculating the sizes of the required split bitmap and the difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
In some embodiments of the invention, the size of the required bitmap is calculated from the capacity x, assuming the required capacity is x bitmap, the capacity of the required split bitmap and difference bitmap is the same. It is queried whether the remaining capacity of the bitmap space is greater than 2x bitmap.
According to some embodiments of the incremental snapshot capacity expansion method of the present invention, in response to the remaining space of the bitmap space satisfying the size of the bitmap space, configuring bitmap information and updating the snapshot progress according to the bitmap information further includes:
and in response to the bitmap space meeting the sizes of the split bitmap and the difference bitmap, configuring all the split bitmaps into a copied state and configuring all the difference bitmaps into a to-be-copied state.
A split bitmap (split bitmap) is used to manage an array structure of data copy operations from a source volume to a target volume in a snapshot relationship. Each element in the array is 1bit in size and is used to mark whether a block of fixed-size (e.g., 256KB) data in the source volume has been copied from the source volume to the target volume. If the bitmap is copied, setting the bit corresponding to the bitmap to be 1; if not copied, it is set to 0. A difference bitmap (diff bitmap) is used to mark which data blocks of the source volume have changed after the snapshot is started (data modification by the host IO). The difference bitmap is an array structure, and each element in the array is 1bit in size. If a certain block of fixed-size data (for example, 256KB) is changed, setting the bit corresponding to the bitmap to be 1; if not copied, it is set to 0.
In some embodiments of the present invention, the split bitmaps of the additional applications are all set to 1 (copied state). Because the snapshot is based on data protection of a time point, when the snapshot is created, the source volume does not have a space with a capacity of x behind the source volume, and therefore after the source volume is expanded, data in the space does not need to be copied to the target volume, and all bitmaps of the space can be set to be 1. Doing so also greatly reduces the copying of useless data, reducing the performance pressure of the system.
In some embodiments of the invention, the snapshot progress is updated based on the bitmap information. The difference bitmaps of the additional applications are all set to 1 (to-be-copied state). Because the snapshot is started, the source volume has no space with the capacity of x behind the source volume, and therefore the data of the newly added space belongs to the data changed after the snapshot is started, all the differential bitmap portions (i.e., the newly added portions of the differential bitmap) corresponding to the data of the newly added space should be set to 1, which indicates that the data of the newly added space is changed when the snapshot is started, and the data of the newly added space should be copied when the snapshot is started next time.
If the snapshot relationship sets a background copy rate (the data of the source volume is copied to the target volume in the background, the larger the value is, the faster the data is copied, if the value is set to 0, the background copy is prohibited), the background copy operation (the data of the source volume is copied to the target volume in the background) is not required to be prohibited in the extension process. Because the background copy operation is to determine from the split bitmap which locations of the source volume have data to copy to the target volume. Because the expansion of the split bitmap is after the volume expansion, the phenomenon that the source volume does not expand but needs to copy the position data after the volume expansion does not occur. In addition, the background copy does not change the data of the source volume, and the updating of the difference bitmap is not involved, so the capacity expansion of the split bitmap can be put before the capacity expansion of the difference bitmap.
According to some embodiments of the incremental snapshot capacity expansion method of the present invention, determining whether the remaining capacity space of the first storage pool where the target volume is located meets the capacity expansion of the preset capacity further includes:
judging whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool or not;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is larger than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of a preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
In some embodiments of the present invention, assuming that the original capacity of the source volume is c and the capacity to be expanded is x, if the source volume and the target volume are in the same storage pool, i.e. both the source volume and the target volume are in the first storage pool, the remaining capacity of the first storage pool should be greater than or equal to 2 x. If the source volume and the target volume are in different storage pools, the remaining capacity of the first storage pool should be greater than x.
According to some embodiments of the method for expanding an incremental snapshot of the present invention, the method further includes:
and responding to the situation that the residual capacity space of the first storage pool does not meet the capacity required by capacity expansion, ending the capacity expansion process, feeding back capacity expansion failure information and recovering the input and output of the source volume and the host.
In some embodiments of the present invention, the target volume queries the first storage pool where the target volume is located whether the remaining capacity in the first storage pool is sufficient, and if the requirement is not met, that is, the remaining capacity is not sufficient, returns the source volume expansion failure information, and recovers the source volume host IO.
According to some embodiments of the method for expanding an incremental snapshot of the present invention, the method further includes:
and in response to that the remaining capacity space of the second storage pool does not meet the capacity required for capacity expansion, performing capacity reduction operation on the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
In some embodiments of the present invention, the source volume queries the second storage pool where it is located whether the capacity remaining in the second storage pool is sufficient. And if the capacity of the second storage pool does not meet the requirement, performing capacity reduction operation on the expanded target volume to reduce the target volume to the original size, then returning the capacity expansion failure information of the source volume, and recovering the host IO of the source volume.
According to some embodiments of the method for expanding an incremental snapshot of the present invention, the method further includes:
and in response to that the residual space of the bitmap space does not meet the size of the required bitmap space, performing capacity reduction operation on the expanded source volume and the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
In some embodiments of the invention, the size of the required bitmap is calculated from the capacity x. And if the bitmap space capacity does not meet the requirement, performing capacity reduction operation on the expanded source volume and the target volume to recover the original capacity, returning capacity expansion failure information of the source volume, and recovering the IO of the host machine of the source volume.
In another aspect of the embodiments of the present invention, an embodiment of an incremental snapshot capacity expansion apparatus is provided. Fig. 2 is a schematic block diagram illustrating an embodiment of an incremental snapshot capacity expansion apparatus according to the present invention, where, in the embodiment illustrated in fig. 2, the apparatus 101 includes:
a target volume expansion space judgment module 11, configured to close input and output between the host and the source volume, and judge whether the remaining capacity space of the first storage pool where the target volume is located meets the expansion of the preset capacity;
a target volume expansion space application module 12, configured to respond that the remaining capacity space of the first storage pool satisfies the capacity required for expansion, and apply a virtual expansion space of a preset capacity to the first storage pool through the target volume;
a source volume expansion space judgment module 13, configured to judge whether the remaining capacity space of the second storage pool where the source volume is located meets the expansion of the preset capacity;
a source volume capacity expansion space application module 14, configured to respond that the remaining capacity space of the second storage pool satisfies the capacity required for capacity expansion, and apply for an actual capacity expansion space of a preset capacity from the second storage pool through the source volume;
a bitmap expansion space judgment module 15, configured to calculate the size of the bitmap space according to the preset capacity, and judge whether the remaining space of the bitmap space can meet the size of the bitmap space;
and a bitmap expansion space application module 16, configured to respond that the remaining space of the bitmap space satisfies the size of the required bitmap space, configure bitmap information, update the snapshot progress according to the bitmap information, feed back successful expansion information, and recover the input and output of the host.
According to some embodiments of the incremental snapshot capacity expansion apparatus of the present invention, the bitmap capacity expansion space determination module 15 is further configured to:
and calculating the sizes of the required split bitmap and the difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
According to some embodiments of the incremental snapshot capacity expansion apparatus of the present invention, the target volume capacity expansion space determining module 11 is further configured to:
judging whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool or not;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is larger than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of a preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
As such, those skilled in the art will appreciate that all of the embodiments, features and advantages set forth above with respect to the incremental snapshot expansion method in accordance with the present invention are equally applicable to the apparatus in accordance with the present invention. For the sake of brevity of the present disclosure, no repeated explanation is provided herein.
It should be particularly noted that, as one of ordinary skill in the art can appreciate that all or part of the processes of the methods of the above embodiments can be implemented by a computer program to instruct related hardware, and the program of the incremental snapshot capacity expansion method can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods as described above. The storage medium of the program may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like. The embodiments of the computer program may achieve the same or similar effects as any of the above-described method embodiments.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as software or hardware depends upon the particular application and design constraints imposed on the overall system. 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 disclosed embodiments of the present invention.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. An incremental snapshot capacity expansion method, the method comprising:
closing input and output between the host and the source volume, and judging whether the residual capacity space of the first storage pool where the target volume is located meets the capacity expansion of the preset capacity;
responding to the capacity space left in the first storage pool meeting the capacity required by capacity expansion, and applying for a virtual capacity expansion space with the preset capacity from the first storage pool through the target volume;
judging whether the remaining capacity space of the second storage pool where the source volume is located meets the expansion capacity of the preset capacity;
responding to the capacity space left in the second storage pool meeting the capacity required by capacity expansion, and applying for an actual capacity expansion space with the preset capacity from the second storage pool through the source volume;
calculating the size of the required bitmap space according to the preset capacity, and judging whether the residual space of the bitmap space can meet the size of the required bitmap space;
and responding to the fact that the residual space of the bitmap space meets the size of the needed bitmap space, configuring bitmap information, updating the snapshot progress according to the bitmap information, feeding back successful capacity expansion information and recovering input and output of the host.
2. The method for expanding incremental snapshot according to claim 1, wherein the calculating the size of the bitmap space required according to the preset capacity, and determining whether the remaining space of the bitmap space can satisfy the size of the bitmap space required further comprises:
and calculating the sizes of the required split bitmap and the required difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
3. The incremental snapshot capacity expansion method of claim 2, wherein the configuring bitmap information and updating snapshot schedules according to the bitmap information in response to the remaining space of the bitmap space satisfying the size of the required bitmap space further comprises:
and in response to the bitmap space meeting the sizes of the split bitmap and the difference bitmap, configuring all the split bitmaps into a copied state and configuring all the difference bitmaps into a to-be-copied state.
4. The method for expanding the incremental snapshot according to claim 1, wherein the determining whether the remaining capacity space of the first storage pool where the target volume is located meets the expansion of the preset capacity further comprises:
determining whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is greater than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of the preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
5. The method for expanding the volume of the incremental snapshot according to claim 1, further comprising:
and in response to that the remaining capacity space of the first storage pool does not meet the capacity required by capacity expansion, ending the capacity expansion process, feeding back capacity expansion failure information and recovering the input and output of the source volume and the host.
6. The method for expanding the volume of the incremental snapshot according to claim 1, further comprising:
and in response to that the remaining capacity space of the second storage pool does not meet the capacity required for capacity expansion, performing capacity reduction operation on the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
7. The method for expanding the volume of the incremental snapshot according to claim 1, further comprising:
and in response to that the residual space of the bitmap space does not meet the size of the required bitmap space, performing capacity reduction operation on the expanded source volume and the expanded target volume according to the preset capacity, feeding back capacity expansion failure information, and recovering the input and output of the source volume and the host.
8. An incremental snapshot capacity expansion apparatus, the apparatus comprising:
the system comprises a target volume expansion space judgment module, a first storage pool and a second storage pool, wherein the target volume expansion space judgment module is configured to close input and output between a host and a source volume and judge whether the residual capacity space of a first storage pool where a target volume is located meets the expansion of preset capacity;
a target volume capacity expansion space application module, configured to respond that a remaining capacity space of the first storage pool satisfies a capacity required for capacity expansion, and apply for a virtual capacity expansion space of the preset capacity from the first storage pool through the target volume;
a source volume expansion space judgment module, configured to judge whether a remaining capacity space of a second storage pool where the source volume is located meets the expansion capacity of the preset capacity;
a source volume capacity expansion space application module, configured to respond that a remaining capacity space of the second storage pool satisfies a capacity required for capacity expansion, and apply for an actual capacity expansion space of the preset capacity from the second storage pool through the source volume;
the bitmap expansion space judgment module is configured to calculate the size of the required bitmap space according to the preset capacity and judge whether the residual space of the bitmap space can meet the size of the required bitmap space;
and the bitmap capacity expansion space application module is configured to respond that the residual space of the bitmap space meets the size of the required bitmap space, configure bitmap information, update the snapshot progress according to the bitmap information, feed back capacity expansion success information and recover the input and the output of the host.
9. The incremental snapshot capacity expansion device of claim 8, wherein the bitmap capacity expansion space determination module is further configured to:
and calculating the sizes of the required split bitmap and the required difference bitmap according to the preset capacity, and judging whether the bitmap space meets the sizes of the split bitmap and the difference bitmap.
10. The incremental snapshot capacity expansion device of claim 8, wherein the target volume capacity expansion space determination module is further configured to:
determining whether the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool;
in response to that the second storage pool of the source volume and the first storage pool of the target volume are the same storage pool, judging whether capacity expansion of the preset capacity is met according to whether the remaining capacity space of the storage pools is greater than or equal to 2 times of the preset capacity;
in response to the second storage pool of the source volume and the first storage pool of the target volume not being the same storage pool, determining whether capacity expansion of the preset capacity is satisfied according to whether a remaining capacity space of the storage pools is greater than or equal to the preset capacity.
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