Patent
Method and device for copy-on-write snapshotting
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TL;DR: In this paper, a method and a device for copy-on-write snapshotting is presented for solving the problem that an existing method and device for CODW snapshotting are slow in request writing response.
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Abstract: The invention discloses a method and device for copy-on-write snapshotting, and relates to the field of computers. The method and device for copy-on-write snapshotting is designed for solving the problem that an existing method and device for copy-on-write snapshotting is slow in request writing response. The method for copy-on-write snapshotting comprises the following steps: receiving a data WRQ; determining whether a data block where the data WRQ is to be written already establishes a snapshot or not, if yes, determining whether the data WRQ is a first data WRQ after the snapshot is established or not, if yes, writing the data in a snapshot area, and establishing a snapshot area data index related to data storage. According to the method and device for copy-on-write snapshotting in the embodiment, the data are written in the snapshot area, and then the data are subsequently transferred into the data block, or a correlation index is established, and therefore the update of the data and the quick response to external data writing are achieved.
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Citations
Patent
Online snapshot method and equipment
Gao Liang
- 06 May 2015
TL;DR: In this article, an online snapshot method and online snapshot equipment are described, where the virtual machine points a first pointer of a second-level index table to the first memory block, and points a second pointer of the second level index tables to the second memory block.
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Patent
Improved copy-on-write snapshot method and system
Zhuang Jianbo
- 03 Feb 2016
TL;DR: In this article, an improved copy-on-write snapshot method is proposed to reduce the interaction between modules in a redundant array of independent disks (RAID) for improving the snapshot performance.
3
Patent
Data snapshot first-writing copying method and device
Meng Xianghong
- 01 Dec 2017
TL;DR: In this article, a data snapshot first-writing copying method was proposed to reduce the copying volume of data blocks in the target storage equipment and improve the performance of the data snapshot.
1
Patent
Method and system for processing data blocks
Li Hong,Wen Lijuan +1 more
- 25 Dec 2018
TL;DR: In this paper, the first data block of a data block is released by a storage device for storing the data file and the data block associated with the file in a case where the snapshot file does not contain the first block.
1
Patent
Data processing method and distributed storage device
Wen Lijuan,Li Hong +1 more
- 25 Sep 2018
TL;DR: In this article, a data processing method which is applied to a distributed storage device and comprises the steps of determining a source and a target node, acquiring a first data file corresponding to the source node and a first snapshot file of the first file, storing all data from the source file into the second file, determining identical data and different data between the file and the file, and determining a storage content in the second snapshot file based on a data index.
References
Patent
Method and device for achieving copy-on-write snapshot
Yongguang Ji,Zhencheng Jin +1 more
- 22 Sep 2010
TL;DR: In this paper, an improved method for achieving copy-on-write (COW) snapshot, which comprises the following steps: setting up the bitmaps for a source data area and a snapshot area, wherein each bit in the bitmap corresponds to N data blocks; and indicating that data are written in the corresponding data blocks if the bit is valid, and if not, indicating that the data are not written in corresponding blocks, wherein N represents a natural number.
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Patent
Data write-in method and apparatus based on copy-on-write
Bing Zhang
- 15 Jul 2009
TL;DR: In this paper, a data writing-in method based on copy-on-write and a device thereof is presented, wherein the method comprises the following steps: receiving the writing request data from the external device; distributing data block for the writing requests data in the source data area; determining whether the distributed data block is written-into for the first time, if the determining result is yes, writing the intrinsic data in a data block distributed in the data area into a high-speed buffer storage, and directly writing the request data into the distributed block; and if a preset refreshing
13
Patent
System of creating logical volume and method thereof
Lei Li,Lei He,Chen Tom,Win-Harn Liu +3 more
- 20 Sep 2007
TL;DR: In this paper, a storage medium offset address pointer is created to record writing position of the copy-on-write operation of the corresponding time point and the pointer is stored in the storage medium to serve as index information of address of each timestamp.
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Patent
Two-phase snap copy
John Kemeny,Michael R. McCarthy,Bradford B. Glade,David W. Harvey,James A. Wentworth,William B. Whalen,Matthew D. Waxman +6 more
- 15 Sep 2004
TL;DR: In this article, a snapshot copy of a data set is provided using a two-phase snapshot copy operation when a write request is received, as part of the first phase, the data at the target location is copied to a snap data area in an allocated data area that is the size of the chunk.
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