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Backup method for key data in hybrid SSD

A key data, hybrid technology, applied in the redundant operation of data error detection, data processing input/output process, electrical digital data processing and other directions, can solve the problem of reducing data backup overhead, delay and increase in write amplification and other problems, to achieve the effect of improving reliability, low write amplification, and good performance

Pending Publication Date: 2021-09-28
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

b class="d_n">[0005] The purpose of the present invention is to provide a method for backing up key data in a hybrid SSD. By accumulating and then migrating the data that needs to be backed up, it is possible to effectively solve the problem on heterogeneous storage media. The problems of delay and write amplification during data backup greatly increase, reducing the cost of data backup

Method used

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  • Backup method for key data in hybrid SSD
  • Backup method for key data in hybrid SSD
  • Backup method for key data in hybrid SSD

Examples

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Embodiment

[0025] Take SLC-TLC hybrid SSD as an example, refer to figure 1 , is the flow chart of the read operation of the present embodiment invention, starting from step 101, and then:

[0026] In step 102, when a read request arrives, the SSD will split a large read request into multiple small read sub-requests for processing respectively.

[0027] In step 103, the SSD controller checks the backup tag delivered with the request to determine whether the requested data is backed up. If the requested data is not backed up, then execute step 104, process the read sub-request according to the traditional read processing flow of the hybrid SSD, and then proceed to step 109 to end; if the requested data has a backup, then execute step 105, read the data from the SLC, Then go to step 106 .

[0028] In step 106, it is determined whether a read error occurs when the SLC reads data. If read error occurs, then execute step 107, read data from TLC, execute step 108 then, carry out data recover...

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Abstract

The invention relates to a backup method for key data in a hybrid SSD, which mainly comprises the following steps: judging whether the data need to be backed up, and for the read operation of the backup data, defaulting that the data of a fast medium is read and a slow medium is used for recovery; and for the write operation of the backup data, selecting a backup mode according to the request size; for a relatively small write request, using accumulative backup, firstly writing two parts of data to a fast medium, and migrating to a slow medium after a certain amount of data is accumulated; for a large write request, writing data into a fast medium and a slow medium at the same time in a traditional backup mode. The invention has the following advantages that by means of the method that the fast medium is written firstly to be accumulated and then migrated to the slow medium, the problems that delay and write amplification are greatly increased due to the fact that the fast medium and the slow medium are written at the same time are solved, and data backup performance and write amplification expenditure can be reduced.

Description

technical field [0001] The invention relates to the technical field of storage reliability, in particular to a key data backup method in a hybrid SSD. Background technique [0002] With the continuous growth of data scale and the continuous improvement of user experience requirements, users have put forward higher requirements on the capacity, access performance and reliability of storage devices at the same time. For the comprehensive consideration of performance and capacity, a hybrid storage device composed of multiple storage media appears. Among them, hybrid SSDs composed of low-density, high-performance, high-cost flash memory (SLC, Z-NAND, etc.) and high-density, low-performance, low-cost flash memory (TLC, QLC, etc.) have been widely used. This kind of hybrid SSD can provide good cost performance, achieve high performance while maintaining low unit capacity cost, and meet performance and capacity requirements at the same time. [0003] At the same time, there are s...

Claims

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Application Information

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IPC IPC(8): G06F11/14G06F3/06
CPCG06F11/1448G06F11/1456G06F11/1469G06F3/0647G06F3/0604
Inventor 石亮丁传敏罗龙飞吕熠娜
Owner EAST CHINA NORMAL UNIVERSITY
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