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Memory system data arrangement and commutation method

A data distribution and storage system technology, applied in the storage field, can solve problems such as data migration, system I/O bottlenecks, and maintenance difficulties

Inactive Publication Date: 2008-06-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

But it has the following disadvantages: (1) difficult to upgrade
(2) Difficult to maintain
Existing methods all have a common problem, that is, data needs to be continuously migrated between different redundancy levels, which will cause system I / O bottlenecks
The continuous migration of data will also cause the mapping relationship to become more and more complex, which is also a bottleneck of the system

Method used

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0016] The storage system data distribution and mutual conversion method of the present invention comprises the following steps:

[0017] Assume that the storage space of the storage system is composed of 2K disks, K≥2, among which, K+1 disks constitute a continuous storage space, and are striped to form a disk array; the remaining K-1 disks constitute an independent disk group; The disk array is divided into continuous storage subspaces, called subarrays, and the redundancy level of the subarrays is set to 0, 1, or 5 according to the needs; the data on the subarrays with redundancy levels 0 and 5 are distributed on the disk On all K+1 disks in the array, the data on the sub-array with redundancy level 1 is distributed on all 2K disks composed of the disk array and the independent disk group. As shown in Figure 1, in Figure 1, 1 indicates a disk, 2 indicat...

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Abstract

The invention discloses a data distribution and mutual conversion method of a storage system. A continuous storage space is formed by a plurality of disks, the disks also form a disk array by strips to partition the disk array into continuous storage subspaces, namely sub array, and then redundancy level can be respectively configured as zero, one, or five according to requirements; during conversion, corresponding modes are selected according to differences of transversion types. The invention has the major concept of adopting suitable data distribution mode for I / O requirements with different inquiry characteristics according to partial characteristic of I / O requirements, thereby enabling the storage system to realize optimal performance. The storage system data distribution conversion method disclosed by the invention facilitates the system being dynamically suitable for changes of I / O requirement characteristic, reduces cost caused by data distribution conversion among different redundancy levels and eliminates performance bottleneck generated by data transfer, thereby greatly improving performance of storage subsystem.

Description

technical field [0001] The invention relates to the field of storage, in particular to a storage system data distribution and mutual conversion method. Background technique [0002] Disk array (RAID) is widely used as a main means to improve the performance of computer storage system. However, due to the diversity and complexity of workload changes in the actual working environment, it is difficult to achieve the optimal performance of the configured RAID: the data distribution forms of different levels of RAID have different application ranges, and can only be used for jobs with a relatively narrow distribution range. Load provides better performance. Moreover, the configuration of RAID is relatively complicated, such as configuring the layout of data blocks and parity blocks, the size of stripe units, the size of cache, and read and write strategies. After the configuration is complete, RAID cannot adapt to changes in workload. To solve this problem, the storage industr...

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Application Information

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IPC IPC(8): G06F3/06
Inventor 谢长生李怀阳刘艳黄建忠蔡斌
Owner HUAZHONG UNIV OF SCI & TECH
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