CN111930562A - Real-time snapshot capacity expansion method and system - Google Patents
Real-time snapshot capacity expansion method and system Download PDFInfo
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- CN111930562A CN111930562A CN202010666178.5A CN202010666178A CN111930562A CN 111930562 A CN111930562 A CN 111930562A CN 202010666178 A CN202010666178 A CN 202010666178A CN 111930562 A CN111930562 A CN 111930562A
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- 230000009467 reduction Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
Abstract
The invention provides a real-time snapshot capacity expansion method and a system, wherein the method comprises the following steps: receiving a snapshot source volume expansion instruction; judging whether the residual capacity of a storage pool where a target volume is located meets capacity expansion according to a received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool; calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied. Based on the method, the invention also provides a real-time snapshot capacity expansion system, and the capacity expansion operation can be carried out on the source volume under the condition of not breaking the snapshot relationship. The data consistency of the snapshot can not be damaged. During execution, the problem that the source volume and the target volume are different in capacity and cannot be started normally does not occur.
Description
Technical Field
The invention belongs to the technical field of storage disaster recovery, and particularly relates to a real-time snapshot capacity expansion method and a real-time snapshot capacity expansion system.
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 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 creating the snapshot relationship, the storage system generates a bitmap for managing the snapshot relationship. At this time, no matter the source volume or the target volume can not execute the volume expansion operation. Once the capacity of one or two volumes is changed, the excessive area is not managed by the corresponding bitmap, and the data inconsistency occurs, so that the purpose of using the snapshot to protect the data cannot be achieved. If the volume expansion is to be realized, the snapshot relationship must be disconnected, and after the two volumes are expanded, the snapshot relationship is reestablished. Therefore, 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 order to solve the technical problem, the invention provides a real-time snapshot capacity expansion method and a system, which can perform volume capacity expansion operation on the premise of not disconnecting a snapshot relation.
In order to achieve the purpose, the invention adopts the following technical scheme: a real-time snapshot capacity expansion method comprises the following steps:
receiving a snapshot source volume expansion instruction;
judging whether the residual capacity of a storage pool where a target volume is located meets capacity expansion according to a received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool;
calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
Further, after receiving the instruction of snapshot source volume expansion, suspending the host where the source volume is located.
Further, the determining whether the remaining capacity of the storage pool where the target volume is located satisfies capacity expansion includes:
if the source volume and the target volume are in the same storage pool, the residual capacity of the storage pool is more than twice of the capacity to be expanded, so that the capacity expansion is satisfied;
if the source volume and the target volume are in different storage pools, the residual capacity of the storage pool where the target volume is located is larger than the capacity to be expanded, and the capacity expansion is met.
Further, the determining whether the remaining capacity of the storage pool where the source volume is located satisfies capacity expansion includes:
the residual capacity of the storage pool where the source volume is located is larger than the capacity to be expanded, so that the capacity expansion is met.
Further, after the source volume applies for the capacity to be expanded to the remaining capacity of the storage pool where the source volume is located, formatting operation is performed on the space of the capacity to be expanded.
Further, if the residual capacity of the storage pool where the target volume is located does not meet capacity expansion; returning to the source volume expansion failure and recovering the source volume host;
if the residual capacity of the storage pool where the source volume is located does not meet the capacity expansion; and the target volume which is expanded is reduced to the capacity before the expansion, and the source volume is returned to fail in the expansion, and the host of the source volume is recovered.
Further, if the bitmap residual capacity does not meet the bitmap required by the capacity to be expanded, capacity reduction operation is performed on the target volume and the source volume which are expanded, the target volume and the source volume are reduced to the capacity before the capacity expansion, the failure of the capacity expansion of the source volume is returned, and the host of the source volume is recovered.
The invention also provides a real-time snapshot capacity expansion system, which comprises a receiving module, a capacity judgment module and a calculation setting module;
the receiving module is used for receiving a snapshot source volume capacity expansion instruction;
the judging and capacity expanding module is used for judging whether the residual capacity of the storage pool where the target volume is located meets capacity expansion according to the received snapshot source volume capacity expanding instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the calculation setting module is used for calculating the bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
Furthermore, the judgment capacity expansion module comprises a first judgment capacity expansion module and a second judgment capacity expansion module;
the first judgment capacity expansion module is used for judging whether the residual capacity of the storage pool where the target volume is located meets capacity expansion according to the received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the second capacity expansion judging module is used for judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; and if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the invention provides a real-time snapshot expansion method and a system, wherein the method comprises the following steps: receiving a snapshot source volume expansion instruction; judging whether the residual capacity of a storage pool where a target volume is located meets capacity expansion according to a received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool; calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied. Based on the method, a real-time snapshot capacity expansion system is also provided. The invention can carry out capacity expansion operation on the source volume without disconnecting the snapshot relation. Therefore, the data consistency of the snapshot is not damaged. When the method is executed, the target volume is firstly expanded, and when a user starts the snapshot next time, the problem that the volume of the source volume is different from that of the target volume, so that the snapshot cannot be started normally does not occur.
In the invention, when the residual capacity of the bitmap meets the bitmap required by the capacity to be expanded, the required bitmap is set to be copied. 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 capacity to be expanded, 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 copied. Doing so also greatly reduces the copying of useless data, reducing the performance pressure of the system.
In addition, if the snapshot relation sets the background copy rate, the background copy operation is not required to be forbidden in the capacity expansion process. Because the background copy operation is to determine from the bitmap which locations of the source volume data need to be copied to the target volume. Because the expansion of the bitmap is located at the end, the phenomenon that the source volume is not expanded and needs to copy the expanded position data can not occur.
Drawings
Fig. 1 is a flowchart of a real-time snapshot expanding method according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a real-time snapshot capacity expansion system according to embodiment 2 of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Example 1
The embodiment 1 of the present invention provides a real-time snapshot capacity expansion method, which can perform a volume capacity expansion operation without breaking a snapshot relationship. The method comprises the following steps:
and receiving an instruction of snapshot source volume expansion.
The host where the source volume is located is suspended.
Judging whether the residual capacity of a storage pool where a target volume is located meets capacity expansion according to a received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; and if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool.
Calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
Fig. 1 is a flowchart of a real-time snapshot expanding method according to embodiment 1 of the present invention.
In step S101, an instruction to expand the snapshot source volume is received.
In step S102, the host in which the source volume is located is suspended.
In step S103, determining whether the remaining capacity of the storage pool where the target volume is located satisfies capacity expansion; if the source volume and the target volume are in the same storage pool, the residual capacity of the storage pool is more than twice of the capacity to be expanded, so that the capacity expansion is satisfied; if the source volume and the target volume are in different storage pools, the residual capacity of the storage pool where the target volume is located is larger than the capacity to be expanded, and the capacity expansion is met. If the capacity expansion is satisfied, executing step S104. If not, step S110 is performed.
In step S104, the target volume applies for the capacity to be expanded from the remaining capacity of the storage pool.
In step S105, it is determined whether or not the remaining capacity of the storage pool in which the source volume is located satisfies capacity expansion. The residual capacity of the storage pool where the source volume is located is larger than the capacity to be expanded, so that the capacity expansion is met. If so, step S107 is performed, and if not, step S106 is performed.
In step S106, the target volume that has been expanded is reduced to the capacity before the expansion. 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. Although steps S104, S105, and S106 are not executed, the data consistency of the snapshot at this time is not affected. However, if the user wants to start the snapshot again, the volume of the source volume is different from that of the target volume, so that the snapshot cannot be started normally.
In step S107, the source volume applies for the capacity to be expanded from the remaining capacity of the storage pool where the source volume is located
In step S108, it is determined whether the bitmap remaining capacity satisfies a bitmap required by the capacity to be expanded. If so, step S112 is performed, and if not, step S109 is performed. The bitmap is used to manage an array structure for copy data operations from the source volume to the 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 the copy is made, the value is set to 0.
In step S109, both the target volume and the source volume are reduced to the capacity before expansion.
In step S110, a source volume expansion failure is returned.
In step S111, the source volume host is restored.
In step S112, the required bitmap is set to be copied, and the snapshot progress is updated according to the bitmap information. In the present invention, the required bitmaps are all set to 1. 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 capacity to be expanded, 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 copied. Doing so also greatly reduces the copying of useless data, reducing the performance pressure of the system.
If the snapshot relationship sets the background copy rate, the background copy operation does not need to be disabled in the expansion process. Because the background copy operation is to determine from the bitmap which locations of the source volume data need to be copied to the target volume. Because the expansion of the bitmap is located at the end, the phenomenon that the source volume is not expanded and needs to copy the expanded position data can not occur.
In step S113, the volume expansion success is reported.
Example 2
The embodiment 2 of the invention also provides a real-time snapshot capacity expansion system. Fig. 2 is a schematic diagram of a real-time snapshot capacity expansion system according to embodiment 1 of the present invention, where the system includes a receiving module, a capacity judgment module, and a calculation setting module;
the receiving module is used for receiving a snapshot source volume capacity expansion instruction;
the judgment capacity expansion module is used for judging whether the residual capacity of the storage pool where the target volume is located meets the capacity expansion according to the received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the calculation setting module is used for calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
The judgment capacity expansion module comprises a first judgment capacity expansion module and a second judgment capacity expansion module;
the first judgment capacity expansion module is used for judging whether the residual capacity of the storage pool where the target volume is located meets capacity expansion according to the received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the second capacity expansion judging module is used for judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; and if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto. Various modifications and alterations will occur to those skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. On the basis of the technical scheme of the invention, various modifications or changes which can be made by a person skilled in the art without creative efforts are still within the protection scope of the invention.
Claims (9)
1. A real-time snapshot capacity expansion method is characterized by comprising the following steps:
receiving a snapshot source volume expansion instruction;
judging whether the residual capacity of a storage pool where a target volume is located meets capacity expansion according to a received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool;
calculating a bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
2. The method according to claim 1, further comprising suspending the host on which the snapshot source volume is located after receiving the instruction to expand the snapshot source volume.
3. The method according to claim 1, wherein said determining whether the remaining capacity of the storage pool where the target volume is located satisfies capacity expansion comprises:
if the source volume and the target volume are in the same storage pool, the residual capacity of the storage pool is more than twice of the capacity to be expanded, so that the capacity expansion is satisfied;
if the source volume and the target volume are in different storage pools, the residual capacity of the storage pool where the target volume is located is larger than the capacity to be expanded, and the capacity expansion is met.
4. The method of claim 1, wherein the determining whether the remaining capacity of the storage pool where the source volume is located satisfies capacity expansion comprises:
the residual capacity of the storage pool where the source volume is located is larger than the capacity to be expanded, so that the capacity expansion is met.
5. The method of claim 4, wherein after the source volume applies for a capacity to be expanded from the remaining capacity of the storage pool, the source volume performs a formatting operation on the space of the capacity to be expanded.
6. The method of claim 3, wherein the snapshot-in-time expansion is performed by a computer,
if the residual capacity of the storage pool where the target volume is located does not meet the capacity expansion; returning to the source volume expansion failure and recovering the source volume host;
if the residual capacity of the storage pool where the source volume is located does not meet the capacity expansion; and the capacity before capacity expansion is reduced and expanded for the expanded target volume, and the expansion failure of the source volume is returned, and the host of the source volume is recovered.
7. The method according to claim 1, wherein if the bitmap remaining capacity does not satisfy the bitmap required by the capacity to be expanded, the capacity reduction operation is performed on both the target volume and the source volume that have been expanded, the target volume and the source volume are both reduced to the capacity before the expansion, and the host of the source volume is restored after the expansion failure of the source volume.
8. A real-time snapshot capacity expansion system is characterized by comprising a receiving module, a capacity judgment module and a calculation setting module;
the receiving module is used for receiving a snapshot source volume capacity expansion instruction;
the judging and capacity expanding module is used for judging whether the residual capacity of the storage pool where the target volume is located meets capacity expansion according to the received snapshot source volume capacity expanding instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool; judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the calculation setting module is used for calculating the bitmap required by the capacity to be expanded; judging whether the bitmap residual capacity meets a bitmap required by the capacity to be expanded or not; if so, the required bitmap is set to copied.
9. The system according to claim 8, wherein the judgment and expansion module comprises a first judgment and expansion module and a second judgment and expansion module;
the first judgment capacity expansion module is used for judging whether the residual capacity of the storage pool where the target volume is located meets capacity expansion according to the received snapshot source volume capacity expansion instruction; if the capacity expansion is met, the target volume applies for the capacity to be expanded from the residual capacity of the storage pool;
the second capacity expansion judging module is used for judging whether the residual capacity of the storage pool where the source volume is located meets capacity expansion; and if the capacity expansion is met, the source volume applies for the capacity to be expanded from the residual capacity of the storage pool.
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| CN202010666178.5A CN111930562A (en) | 2020-07-10 | 2020-07-10 | Real-time snapshot capacity expansion method and system |
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| CN202010666178.5A CN111930562A (en) | 2020-07-10 | 2020-07-10 | Real-time snapshot capacity expansion method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113282250A (en) * | 2021-07-19 | 2021-08-20 | 苏州浪潮智能科技有限公司 | Method, device and equipment for cloud volume expansion and readable medium |
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| CN105095102A (en) * | 2015-08-12 | 2015-11-25 | 浪潮(北京)电子信息产业有限公司 | Automatic expansion method and device for snapshot volume |
| CN106371763A (en) * | 2016-08-23 | 2017-02-01 | 浪潮(北京)电子信息产业有限公司 | Snapshot storage method and apparatus, disk and computer |
| CN110209497A (en) * | 2019-05-21 | 2019-09-06 | 深圳供电局有限公司 | A kind of method and system of the scalable appearance of host resource dynamic |
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Patent Citations (3)
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| CN105095102A (en) * | 2015-08-12 | 2015-11-25 | 浪潮(北京)电子信息产业有限公司 | Automatic expansion method and device for snapshot volume |
| CN106371763A (en) * | 2016-08-23 | 2017-02-01 | 浪潮(北京)电子信息产业有限公司 | Snapshot storage method and apparatus, disk and computer |
| CN110209497A (en) * | 2019-05-21 | 2019-09-06 | 深圳供电局有限公司 | A kind of method and system of the scalable appearance of host resource dynamic |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113282250A (en) * | 2021-07-19 | 2021-08-20 | 苏州浪潮智能科技有限公司 | Method, device and equipment for cloud volume expansion and readable medium |
| CN113282250B (en) * | 2021-07-19 | 2022-02-22 | 苏州浪潮智能科技有限公司 | Method, device and equipment for cloud volume expansion and readable medium |
| WO2023000535A1 (en) * | 2021-07-19 | 2023-01-26 | 苏州浪潮智能科技有限公司 | Cloud volume expansion method and apparatus, and device and readable medium |
| US11886305B2 (en) | 2021-07-19 | 2024-01-30 | Inspur Suzhou Intelligent Technology Co., Ltd. | Method and apparatus for expanding cloud volume, and device and readable medium |
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