CN110990194A - Calculation method, calculation system and related device for snapshot stop time - Google Patents
Calculation method, calculation system and related device for snapshot stop time Download PDFInfo
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- CN110990194A CN110990194A CN201911157786.7A CN201911157786A CN110990194A CN 110990194 A CN110990194 A CN 110990194A CN 201911157786 A CN201911157786 A CN 201911157786A CN 110990194 A CN110990194 A CN 110990194A
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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
- G06F11/30—Monitoring
- G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
- G06F11/3409—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment for performance assessment
- G06F11/3419—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment for performance assessment by assessing time
Abstract
The application provides a method for calculating snapshot stop time, which comprises the following steps: when the target snapshot stops, judging whether a downstream snapshot exists in the target snapshot; if not, the snapshot stop time is 0; if yes, acquiring a first bitmap of the target snapshot and a second bitmap of the downstream snapshot; determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the number of bits is 0 or 1; and determining the snapshot stop time according to the copied data block number, the size of each data block and the clearing rate in the clearing bitmap. The method and the device can accurately determine the time required by the target snapshot from starting to stopping to completely stopping, facilitate subsequent data backup and storage or data test operation, and improve the data backup or data test efficiency. The application also provides a computing system, a computer readable storage medium and a terminal for snapshotting the stop time, which have the beneficial effects.
Description
Technical Field
The present application relates to the field of storage systems, and in particular, to a method, a system, and a related apparatus for calculating snapshot stop time.
Background
When a stop operation is currently performed on a snapshot, since the operation is not completed instantaneously, the completion time is affected by the target volume data, the target volume downstream volume data, and the purge rate. However, the current storage system has no prediction method of the time required for snapshot stop, so that a user can not know how long the snapshot stop needs to be completed, and the execution efficiency of subsequent processes such as data backup, storage, test and the like is affected.
Disclosure of Invention
The application aims to provide a method, a system, a computer readable storage medium and a terminal for calculating snapshot stop time, which can accurately calculate the time required by snapshot stop operation.
In order to solve the above technical problem, the present application provides a method for calculating a snapshot stop time, which has the following specific technical scheme:
when the target snapshot stops, judging whether a downstream snapshot exists in the target snapshot;
if not, the snapshot stop time is 0;
if yes, acquiring a first bitmap of a target snapshot and a second bitmap of the downstream snapshot;
determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1;
and determining snapshot stop time according to the copied data block quantity, the size of each data block and the clearing rate in the clearing bitmap.
And the bit number is a state corresponding to the data block, when the bit number is 1, the current data block is copied from the source volume, and when the bit number is 0, the current data block is not copied.
Wherein determining a clear bitmap according to the number of bits of each data block in the first bitmap and the second bitmap comprises:
determining the bit number of each data block of the first bitmap and the second bitmap;
the clearing bitmap is the intersection of the inverted bit number of the first bitmap and the second bitmap.
Before judging whether the target snapshot has a downstream snapshot, the method further comprises the following steps:
determining a dependency chain between snapshots;
judging whether the target snapshot has a downstream snapshot comprises:
and judging whether the target snapshot has a downstream snapshot or not according to the dependency chain.
Before determining the dependency chain between the snapshots, the method further includes:
determining a snapshot type so as to execute the step of determining a dependency chain between snapshots according to the snapshot type;
wherein the snapshot type comprises a multi-target volume snapshot or a cascaded snapshot.
The present application further provides a snapshot stop time calculation system, including:
the judging module is used for judging whether the target snapshot has a downstream snapshot or not when the target snapshot stops; if not, the snapshot stop time is 0;
the acquisition module is used for acquiring a first bitmap of a target snapshot and a second bitmap of the downstream snapshot when the judgment module judges that the target snapshot is the positive;
the bitmap calculation module is used for determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1;
and the time calculation module is used for determining the snapshot stop time according to the copied data block number, the size of each data block and the clearing rate in the clearing bitmap.
Wherein, still include:
the snapshot relation determining module is used for determining a dependency chain between snapshots;
the judging module is specifically a module for judging whether the target snapshot has a downstream snapshot according to the dependency chain when the target snapshot stops.
Wherein, still include:
a snapshot type determining module, configured to determine a snapshot type, so as to perform a step of determining a dependency chain between snapshots according to the snapshot type; wherein the snapshot type comprises a multi-target volume snapshot or a cascaded snapshot.
The present application also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the calculation method as described above.
The present application further provides a terminal, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the computing method when calling the computer program in the memory.
The application provides a method for calculating snapshot stop time, which comprises the following steps: when the target snapshot stops, judging whether a downstream snapshot exists in the target snapshot; if not, the snapshot stop time is 0; if yes, acquiring a first bitmap of a target snapshot and a second bitmap of the downstream snapshot; determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1; and determining snapshot stop time according to the copied data block quantity, the size of each data block and the clearing rate in the clearing bitmap.
According to the method and the device, the data blocks which are on the stopped snapshot and needed by the downstream snapshot are determined by determining the bitmaps of the stopped snapshot and the downstream snapshots thereof, and then the corresponding snapshot stop time is determined according to the data blocks, the number of the data blocks and the clear number of the data blocks, so that the time needed by the target snapshot from starting to stopping to completely stopping can be accurately determined, the subsequent data backup storage or data test operation is facilitated, and the data backup or data test efficiency is improved. The application also provides a computing system, a computer readable storage medium and a terminal for snapshotting the stop time, which have the above beneficial effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for calculating a snapshot stop time according to an embodiment of the present application;
FIG. 2 is a diagram illustrating a multi-target volume snapshot startup relationship according to an embodiment of the present application;
FIG. 3 is a diagram illustrating a multi-target volume snapshot dependency provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a computing system for snapshot stop time according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart of a method for calculating a snapshot stop time according to an embodiment of the present application, where the method includes:
s101: when the target snapshot stops, judging whether a downstream snapshot exists in the target snapshot; if not, entering 102; if yes, entering S103;
when the snapshot is stopped, whether the stopped target snapshot has a downstream snapshot needs to be judged. Generally, before this step, a dependency chain between snapshots may be determined, so that whether a target snapshot has a downstream snapshot may be determined directly according to the dependency chain. Determining the dependency chain between the snapshots refers to determining the dependency chain according to the connection types and the generation sequence between the snapshots. When querying data, each volume will obtain data from the volume on which it depends, and if the volume on which it depends does not find the required data, then obtain from the dependent volume on which it depends, and so on, and obtain along the dependency chain until finally finding the required data.
S102: confirming that the snapshot stop time is 0;
if the target snapshot does not have the downstream snapshot, the target snapshot can be directly stopped at the moment, and because the target snapshot does not have the downstream snapshot, no snapshot item table snapshot query data exists, and data copying is not needed, so that the snapshot stopping time is 0 at the moment.
S103: acquiring a first bitmap of a target snapshot and a second bitmap of a downstream snapshot;
s104: determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the number of bits is 0 or 1;
when the target snapshot has a downstream snapshot, respective bitmaps of the target snapshot and the downstream snapshot are obtained first. The bitmap is a bitmap which uses bit to indicate the state of stored data, and is usually used to determine whether a data exists. The bit number is a state corresponding to the data block, and usually indicates that the current data block is copied from the source volume when the bit number is 1, and indicates that the current data block is not copied when the bit number is 0. Therefore, the storage status of the corresponding data block can be determined according to the bitmap of the snapshot, and whether the data block is copied or not can be confirmed in the step.
Preferably, in this step, the bit number of each data block of the first bitmap and the second bitmap may be determined first, then the clearing bitmap is an intersection of the inverted bit number of the first bitmap and the second bitmap, and a bitmap which needs to be cleared and has a bit number of 1 in the intersection is represented as a data block which is present in the target snapshot and needed by the downstream snapshot. When the data blocks are stopped and then the target snapshot is stopped, the data blocks need to be copied firstly to completely stop the target snapshot due to the requirement of the downstream snapshot, otherwise, the data loss of the downstream snapshot data due to the stop of the target snapshot is caused.
S105: and determining the snapshot stop time according to the copied data block number, the size of each data block and the clearing rate in the clearing bitmap.
In step S104, it has been determined that the clear bitmap is a bit whose bit number is 1 in the intersection of the inverted bit number of the first bitmap and the second bitmap, and this step may directly determine the number of data blocks whose bit number is 1 in the intersection. The data block sizes in the snapshot are generally the same, so the total amount of data to be cleared can be directly obtained according to the number of data blocks and the unit data block size, and the time from starting to stopping to completely stopping of the target snapshot can be directly obtained once the clearing rate is determined. The purge rate is not limited to this, and can be freely set by those skilled in the art. Due to the magnitude difference of the different snapshots, from Kb, Mb to Gb and even Tb, etc., the processing power of the processors in which the snapshots are located also differs, and the clearing rate is not limited in detail here.
According to the method and the device, the data blocks which are on the stopped snapshot and needed by the downstream snapshot are determined by determining the bitmaps of the stopped snapshot and the downstream snapshots thereof, and then the corresponding snapshot stop time is determined according to the number and the clear number of the data blocks and the data blocks, so that the time needed by the target snapshot from starting to stopping completely can be accurately determined, a user can obtain the time needed by stopping the snapshot completely only by determining the removal rate, the snapshot state does not need to be checked repeatedly, the subsequent data backup storage or data test operation is facilitated, and the data backup or data test efficiency is improved.
Preferably, in step S101 of the above embodiment, determining whether the target snapshot has a downstream snapshot generally requires determining a dependency chain between the snapshots, and before determining the dependency chain between the snapshots, the method may further include:
determining a snapshot type so as to execute the step of determining a dependency chain between snapshots according to the snapshot type;
the snapshot type in the above embodiments is not particularly limited, and may be, for example, a multi-target volume snapshot or a cascade snapshot.
For a multi-target volume snapshot or a cascaded snapshot, a dependency relationship exists between multiple snapshots. For multi-target volumes, an earlier created snapshot is dependent on a later created snapshot. Whereas for cascading snapshots, a later created snapshot depends on an earlier created snapshot. In the case of a multi-target volume, as shown in fig. 2, snapshot maps 0 through map3 are created and started in sequence, and their dependency relationship is shown in fig. 3.
As can be seen in FIG. 3, the earliest created map0 depends on the earlier created map1, the earlier created map1 depends on the later created map2, and the later created map2 depends on the latest created map 3. The existence of dependencies may relieve the IO pressure of the source volume. When no dependency exists, the 4 target volumes acquire data from the source volume src; after the dependency relationship exists, a volume can preferentially acquire data from the volume which is depended on by the volume, if the data cannot be acquired, the data is acquired from the dependent volume which is depended on by the volume, and the data is searched upstream along the dependency chain until the required data is found.
When a snapshot is stopped, the snapshot relationship and the corresponding target volume are removed from the dependency chain, and the remaining two dependency chains are connected to form a new dependency chain at the fracture. The removed target volume may hold data needed by other volumes and therefore needs to be copied to the downstream volume (the purge flow) before it is removed from the dependency chain and then removed from the dependency chain. Taking stop map2 as an example, data depended by tgt1 may be stored in the target volume tgt2 of map2, so when stopping map2, the dependent data is cleared into tgt1, then map2 and tgt2 are deleted from the dependent chains, and finally the split two-end linked chains are reconnected, so that map1 depends on map 3.
Therefore, it can be seen that when a stop operation is performed on a snapshot, the operation is not completed instantaneously, and the completion time is affected by the target volume data, the data of the volumes downstream of the target volume, and the purge rate.
In the following, a computing system of snapshot stop time provided by the embodiment of the present application is introduced, and the computing system described below and the above-described method for calculating snapshot stop time may be referred to correspondingly.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a snapshot stop time computing system provided in an embodiment of the present application, and the present application further provides a snapshot stop time computing system, including:
the determining module 100 is configured to determine whether a downstream snapshot exists in a target snapshot when the target snapshot stops; if not, the snapshot stop time is 0;
an obtaining module 200, configured to obtain a first bitmap of a target snapshot and a second bitmap of the downstream snapshot when the determining module determines that the target snapshot is a positive snapshot;
a bitmap calculation module 300, configured to determine a clear bitmap according to the number of bits of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1;
and a time calculation module 400, configured to determine snapshot stop time according to the number of copied data blocks in the purge bitmap, the size of each data block, and a purge rate.
Based on the above embodiment, as a preferred embodiment, the method may further include:
the snapshot relation determining module is used for determining a dependency chain between snapshots;
the determining module 100 is specifically a module configured to determine whether a downstream snapshot exists in the target snapshot according to the dependency chain when the target snapshot stops.
Based on the above embodiment, as a preferred embodiment, the method may further include:
a snapshot type determining module, configured to determine a snapshot type, so as to perform a step of determining a dependency chain between snapshots according to the snapshot type; wherein the snapshot type comprises a multi-target volume snapshot or a cascaded snapshot.
The present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program can implement the steps of the method for calculating the snapshot stop time provided in the foregoing embodiments when executed. The storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The application further provides a terminal, which may include a memory and a processor, where the memory stores a computer program, and when the processor calls the computer program in the memory, the steps of the method for calculating the snapshot stop time provided in the foregoing embodiment may be implemented. Of course, the terminal may also include various network interfaces, power supplies, and the like.
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. For the system provided by the embodiment, the description is relatively simple because the system corresponds to the method provided by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for calculating snapshot stop time is characterized by comprising the following steps:
when the target snapshot stops, judging whether a downstream snapshot exists in the target snapshot;
if not, the snapshot stop time is 0;
if yes, acquiring a first bitmap of a target snapshot and a second bitmap of the downstream snapshot;
determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1;
and determining snapshot stop time according to the copied data block quantity, the size of each data block and the clearing rate in the clearing bitmap.
2. The computing method of claim 1, wherein the bit number is a state corresponding to the data block, and when the bit number is 1, it indicates that the current data block has been copied from the source volume, and when the bit number is 0, it indicates that the current data block has not been copied.
3. The computing method of claim 2, wherein determining a clear bitmap based on the number of bits of each data block in the first bitmap and the second bitmap comprises:
determining the bit number of each data block of the first bitmap and the second bitmap;
the clearing bitmap is the intersection of the inverted bit number of the first bitmap and the second bitmap.
4. The computing method according to claim 1, wherein determining whether the target snapshot is a downstream snapshot further comprises:
determining a dependency chain between snapshots;
judging whether the target snapshot has a downstream snapshot comprises:
and judging whether the target snapshot has a downstream snapshot or not according to the dependency chain.
5. The computing method of claim 4, wherein prior to determining the dependency chain between snapshots, further comprising:
determining a snapshot type so as to execute the step of determining a dependency chain between snapshots according to the snapshot type;
wherein the snapshot type comprises a multi-target volume snapshot or a cascaded snapshot.
6. A snapshot stop time computing system, comprising:
the judging module is used for judging whether the target snapshot has a downstream snapshot or not when the target snapshot stops; if not, the snapshot stop time is 0;
the acquisition module is used for acquiring a first bitmap of a target snapshot and a second bitmap of the downstream snapshot when the judgment module judges that the target snapshot is the positive;
the bitmap calculation module is used for determining a clearing bitmap according to the bit number of each data block in the first bitmap and the second bitmap; the bit number is 0 or 1;
and the time calculation module is used for determining the snapshot stop time according to the copied data block number, the size of each data block and the clearing rate in the clearing bitmap.
7. The computing system of claim 6, further comprising:
the snapshot relation determining module is used for determining a dependency chain between snapshots;
the judging module is specifically a module for judging whether the target snapshot has a downstream snapshot according to the dependency chain when the target snapshot stops.
8. The computing system of claim 6, further comprising:
a snapshot type determining module, configured to determine a snapshot type, so as to perform a step of determining a dependency chain between snapshots according to the snapshot type; wherein the snapshot type comprises a multi-target volume snapshot or a cascaded snapshot.
9. 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 according to any one of claims 1 to 5.
10. A terminal, characterized in that it comprises a memory in which a computer program is stored and a processor which, when it is called up in said memory, implements the steps of the method according to any one of claims 1 to 5.
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Application publication date: 20200410 |