A device and method for dynamically adjusting redundant raid array reconstruction

Abstract

The invention provides a device for dynamically regulating redundant RAID array reconstruction. The device is applied to a storage device, and the storage device is provided with a write cache which is used for services to write IO. The device is characterized by comprising a write cache using judging module and a reconstruction command issuing module, wherein the write cache using judging module is used for judging whether the using space of the write cache exceeds a threshold value or not and informing the reconstruction command issuing module a judge result, and the reconstruction command issuing module is used for enabling an RAID reconstruction thread to be dormant for m milliseconds then issuing a reconstruction command to reduce reconstruction speed when the using space of the write cache exceeds the threshold value, the m is a preset value, and issuing the reconstruction command immediately when the using space of the write cache is lower than the threshold value. Based on an identical conception, the invention further provides a method for dynamically regulating the redundant RAID array reconstruction. According to the technology of the method for dynamically regulating the redundant RAID array reconstruction, the used space of the write cache is used as a basis for judging service pressure degree, and compared with a method of counting the IO number of an array, the method is more accurate.

Description

technical field [0001] The invention relates to the field of storage, and in particular to a technology in the aspect of reconstruction of a redundant RAID array (Redundant Array of Inexpensive Disks, redundant array of inexpensive disks). Background technique [0002] When there is business traffic, the reconstruction of the RAID array has both reconstruction IO and business IO for the disks in the array. The IO that the disk can bear is certain. If the reconstruction speed is relatively fast, when the service traffic is relatively large, the service will be affected and service performance will be degraded; if the reconstruction speed is relatively slow, the reconstruction time will be very long. If another disk fails, the risk of array failure is also high. greatly increase. Most of the existing solutions adjust the RAID array reconstruction based on the IO statistics of the array. However, for storage devices with write cache, it is not very accurate to adjust RAID ar...

AI Technical Summary

Problems solved by technology

[0005] Based on array IO statistics as the basis for judging the size of external IO traffic, this basis cannot distinguish between sequential IO and random IO, so adjusting the rebuilding speed of redundant RAID arrays based on this is not an ideal method

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