CN107391396B - Data partitioning method of snapshot-writable device and snapshot-writable device - Google Patents
Data partitioning method of snapshot-writable device and snapshot-writable device Download PDFInfo
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Abstract
The invention discloses a data partitioning method of a snapshot-writable device and the snapshot-writable device, wherein the method comprises the following steps: receiving data of a preset logic block address; if the data is the first-write copy data, allocating corresponding space storage data in a first-write copy area in the space of the writable snapshot device, and establishing mapping between the logical block address and the space allocated by the first-write copy area; if the data is the host application write data, distributing corresponding space storage data in a host service area in the space of the writable snapshot device, and establishing mapping between the logical block address and the corresponding space distributed by the host service area; the invention stores the first-write copy data and the host application write data in a partition by utilizing the logic partition in the writable snapshot device, and organizes the mapping of the metadata according to the logic partition, thereby ensuring that the writable snapshot device can store the first-write copy data as a data set at the snapshot time and can also store the host application write data.
Description
Technical Field
The invention relates to the technical field of data center disaster recovery, in particular to a data partitioning method of a writable snapshot device and the writable snapshot device.
Background
Snapshot is a disaster recovery technique that involves a fully available copy of a given data set, including an image of the corresponding data at some point in time (the point in time at which the copy began). The snapshot may be a copy of the data it represents or may be a replica of the data.
In the prior art, in the snapshot in the first write copy implementation manner, after a write request is received for the first time after the snapshot is created, data in a corresponding position needs to be read, then stored in other positions, and finally a new write request is written down. Therefore, for the writable snapshot device, if the same position is accessed by the write request of the host application, the write data of the host application can cover the first-write copy data, so that the first-write copy data cannot be completely stored in the data set at the snapshot time. Therefore, how to ensure that the writable snapshot device can store the first-write copy data as the data set at the snapshot time and can also store the host application write data is a problem that needs to be solved urgently today.
Disclosure of Invention
The invention aims to provide a data partitioning method of a writable snapshot device and the writable snapshot device, which are used for storing first-write copy data and host application write data in a partitioned mode by utilizing a logic partition in the writable snapshot device, so that the snapshot performance of a data center is improved, and the competitiveness of the data center is improved.
In order to solve the above technical problem, the present invention provides a data partitioning method for a writable snapshot device, including:
receiving data of a preset logic block address;
if the data is write-first copy data, allocating a corresponding space in a write-first copy area in a space of the writable snapshot device to store the data, and establishing mapping between the logical block address and the space allocated by the write-first copy area;
and if the data is the host application write data, allocating a corresponding space in a host service area in the space of the writable snapshot device to store the data, and establishing mapping between the logical block address and the corresponding space allocated to the host service area.
Optionally, before receiving the data of the preset logical block address, the method further includes:
and logically partitioning the space of the writable snapshot device, and dividing the space of the writable snapshot device into the first write copy area and the host service area.
Optionally, the space of the writable snapshot device is specifically a linear address space.
In addition, the present invention also provides a writable snapshot apparatus, including:
the receiving module is used for receiving data of a preset logic block address;
the first storage module is used for allocating a corresponding space in a first write copy area in a space of a writable snapshot device to store the data and establishing mapping between the logical block address and the corresponding space allocated by the first write copy area if the data is the first write copy data;
and the second storage module is used for allocating a corresponding space in a host service area in the space of the writable snapshot device to store the data and establishing mapping between the logical block address and the corresponding space allocated to the host service area if the data is the host application write data.
Optionally, the apparatus further comprises:
and the partition module is used for logically partitioning the space of the writable snapshot device and dividing the space of the writable snapshot device into the first write copy area and the host service area.
The invention provides a data partitioning method of a writable snapshot device, which comprises the following steps: receiving data of a preset logic block address; if the data is the first-write copy data, allocating corresponding space storage data in a first-write copy area in the space of the writable snapshot device, and establishing mapping between the logical block address and the space allocated by the first-write copy area; if the data is the host application write data, distributing corresponding space storage data in a host service area in the space of the writable snapshot device, and establishing mapping between the logical block address and the corresponding space distributed by the host service area;
therefore, the invention can store the first-write copy data or the host application write data in a partition way by allocating the corresponding space in the first-write copy area or the host service area in the space of the writable snapshot device, and can store the first-write copy data and the host application write data in a partition way by utilizing the logic partition in the writable snapshot device; by establishing mapping of the logical block address and the corresponding space allocated by the first-write copy area or the host service area, mapping of metadata can be organized according to logical partitions, so that the writable snapshot device can store the first-write copy data as a data set at the snapshot time, and can also store host application write data, thereby improving the performance of data center snapshot and improving the competitiveness of a data center. In addition, the invention also provides a writable snapshot device, which also has the beneficial effects.
Drawings
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, it is obvious that the drawings in the following description are only embodiments of the present invention, 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 data partitioning method of a writable snapshot device according to an embodiment of the present invention;
fig. 2 is a data storage diagram illustrating a data partitioning method of a writable snapshot apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram of a writable snapshot apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a data partitioning method of a writable snapshot device according to an embodiment of the present invention. The method can comprise the following steps:
step 101: receiving data of a preset logic block address.
The specific mode of this step may be set by the designer according to the practical scenario and the user requirement, and if a mode similar to the prior art may be adopted, this embodiment does not set any limitation thereto.
Step 102: and if the data is the first-write copy data, allocating corresponding space to store the data in a first-write copy area in the space of the writable snapshot device, and establishing mapping between the logical block address and the space allocated to the first-write copy area.
The space of the writable snapshot device can be a linear address space, and the linear address space can be logically partitioned into a first-write copy area and a host service area; other partitions may also be partitioned. As long as two areas capable of storing the first-write copy data and the host application write data can be divided, the specific dividing manner and the size of the divided space can be set by a designer according to a practical scene and user requirements, and the embodiment is not limited thereto.
Step 103: if the data is the host application write data, allocating corresponding space storage data in a host service area in the space of the writable snapshot device, and establishing mapping between the logical block address and the corresponding space allocated by the host service area.
It is understood that, as shown in fig. 2, after the snapshot (writable snapshot device) is established, when the first-write copy data of the preset logical block address Lba1 is received, the corresponding space p1 is allocated in the first-write copy area to store the first-write copy data, and a mapping of Lba1- > p1 is established in step 102 and step 103. Similarly, when the host application writes data to the Lba1, the host application write data may be stored in a space p4 allocated in the host service area, and a mapping of Lba1- > p4 is established, so that the snapshot may store the data set at the snapshot time and may accept the host application write access by isolating the first-write copy data and the host application write data.
In this embodiment, in the embodiment of the present invention, the first-write copy data or the host application write data is stored in a space allocated to the first-write copy area or the host service area in the space of the writable snapshot device, and the first-write copy data and the host application write data can be stored in a partitioned manner by using a logical partition inside the writable snapshot device; by establishing mapping of the logical block address and the corresponding space allocated by the first-write copy area or the host service area, mapping of metadata can be organized according to logical partitions, so that the writable snapshot device can store the first-write copy data as a data set at the snapshot time, and can also store host application write data, thereby improving the performance of data center snapshot and improving the competitiveness of a data center.
Referring to fig. 3, fig. 3 is a block diagram of a writable snapshot apparatus according to an embodiment of the present invention. The apparatus may include:
a receiving module 100, configured to receive data of a preset logical block address;
a first storage module 200, configured to allocate, if the data is write-first data, a corresponding space in a write-first copy area in a space of the writable snapshot apparatus to store the data, and establish mapping between a logical block address and the space allocated by the write-first copy area;
the second storage module 300 is configured to, if data is host application write data, allocate a corresponding space in a host service area in a space of the writable snapshot device to store the data, and establish mapping between a logical block address and the corresponding space allocated to the host service area.
Optionally, the apparatus may further include:
and the partition module is used for logically partitioning the space of the writable snapshot device and dividing the space of the writable snapshot device into a first write copy area and a host service area.
In this embodiment, in the embodiment of the present invention, through the first storage module 200 and the second storage module 300, the first write copy data or the host application write data is stored in a space allocated to a first write copy area or a host service area in a space of the writable snapshot device, and the first write copy data and the host application write data can be stored in a partition manner by using a logical partition inside the writable snapshot device; by establishing mapping of the logical block address and the corresponding space allocated by the first-write copy area or the host service area, mapping of metadata can be organized according to logical partitions, so that the writable snapshot device can store the first-write copy data as a data set at the snapshot time, and can also store host application write data, thereby improving the performance of data center snapshot and improving the competitiveness of a data center.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The data partitioning method and the writable snapshot device of the writable snapshot device provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (2)
1. A method for partitioning data of a writable snapshot device, comprising:
receiving data of a preset logic block address;
if the data is write-first copy data, allocating a corresponding space in a write-first copy area in a space of the writable snapshot device to store the data, and establishing mapping between the logical block address and the space allocated by the write-first copy area;
if the data is host application write data, allocating a corresponding space in a host service area in the space of the writable snapshot device to store the data, and establishing mapping between the logical block address and the corresponding space allocated to the host service area;
before receiving the data of the preset logical block address, the method further includes:
performing logical partitioning on the space of the writable snapshot device, and dividing the space of the writable snapshot device into the first write copy area and the host service area;
the space of the writable snapshot device is specifically a linear address space.
2. A writable snapshot apparatus, comprising:
the receiving module is used for receiving data of a preset logic block address;
the first storage module is used for allocating a corresponding space in a first write copy area in a space of a writable snapshot device to store the data and establishing mapping between the logical block address and the corresponding space allocated by the first write copy area if the data is the first write copy data;
a second storage module, configured to allocate, if the data is host application write data, a corresponding space in a host service area in a space of the writable snapshot device to store the data, and establish mapping between the logical block address and the corresponding space allocated by the host service area;
further comprising:
and the partition module is used for logically partitioning the space of the writable snapshot device and dividing the space of the writable snapshot device into the first write copy area and the host service area, wherein the space of the writable snapshot device is a linear address space.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101140542A (en) * | 2007-10-19 | 2008-03-12 | 华中科技大学 | Method for copying snapshot writing response time in the time of shortening writing time |
| CN101174231A (en) * | 2006-11-03 | 2008-05-07 | 英业达股份有限公司 | Snap backup method |
| CN105988895A (en) * | 2015-02-10 | 2016-10-05 | 中兴通讯股份有限公司 | Snapshot processing method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110161298A1 (en) * | 2009-12-29 | 2011-06-30 | Grobman Steven L | System and method for opportunistic re-imaging using cannibalistic storage techniques on sparse storage devices |
| KR20150081810A (en) * | 2014-01-07 | 2015-07-15 | 한국전자통신연구원 | Method and device for multiple snapshot management of data storage media |
| US9870322B2 (en) * | 2015-11-12 | 2018-01-16 | International Business Machines Corporation | Memory mapping for object-based storage devices |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174231A (en) * | 2006-11-03 | 2008-05-07 | 英业达股份有限公司 | Snap backup method |
| CN101140542A (en) * | 2007-10-19 | 2008-03-12 | 华中科技大学 | Method for copying snapshot writing response time in the time of shortening writing time |
| CN105988895A (en) * | 2015-02-10 | 2016-10-05 | 中兴通讯股份有限公司 | Snapshot processing method and device |
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