Method, device and system for controlling RAID
A controller and consistent technology, applied in the computer field, can solve problems such as RAID read and write performance degradation, data loss, RAID failure, etc., and achieve the effect of avoiding the decline of RAID read and write capabilities
Active Publication Date: 2011-01-05
HUAWEI TECH CO LTD
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Problems solved by technology
When a member disk in the RAID is offline and the RAID works in degraded mode, the read and write performance of the RAID will decrease; if multiple member disks in the RAID are offline, it may further cause RAID failure and data loss
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The embodiment of the invention discloses a method, a device and a system for controlling RAID. The method for controlling RAID comprises the following steps: when an off-line member disc is detected in RAID actually, preserving a command which is issued by the off-line member disc by a RAID controller instead of directly reforming an off-line state of the member disc to the RAID controller; setting a safe time limit for the off-line member disc; if the off-line member disc is online in the safe time limit, returning the issued command of the off-line member disc by the stored RAID controllerto the member disc to ensure that the member disc can continuously operate in a normal state, thereby avoiding the condition that the off-line state of the member disc is directly reported to the RAID controller to cause the RAID to enter a degrading mode in the prior art. The method for controlling RAID is used for shielding instant off-line and online events of the member disc in the safe time limit and avoiding RAID literacy reduction caused by the off-line and online events of the member disc in the safe time limit.
Description
A method, device and system for controlling RAID technical field The present invention relates to the field of computer technology, in particular to a method, device and system for controlling RAID. Background technique With the development of information technology, network bandwidth and processor performance have been rapidly improved. However, the most important external storage device of the computer - the disk, not only has not been able to get rid of the role of system performance bottleneck, but also has potential hidden dangers in data security. Once the disk is damaged, the loss caused by it may be immeasurable. The redundant array of independent disks (RAID, RedundantArrayofIndependentDisks) technology is currently the most widely used technology for improving disk storage performance and data security. By combining multiple disks into an array, RAID selectively distributes data on the array to increase the speed of data reading and writing; at the same time, ...
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IPC IPC(8): G06F3/06
Inventor 吕先锋曲锐陈光刘林超
Owner HUAWEI TECH CO LTD