Possible causes of RAID group exceptions

RAID group exceptions include RAID group degrade and RAID group failure. The root cause of the RAID group exceptions are disk failures. The possible causes are as follows: bit error isolation, disk faults, and enclosure offline (a RAID group consisting of disks from different enclosures). When the RAID group is degraded, if the system has idle or hot spare disks, the system automatically starts reconstruction and reconstructs the data in the faulty disk to the hot spare disk. Performance may be deteriorated during the reconstruction. If the disk is reconstructed, reduce the service pressure of the reconstructed RAID group if possible, so that the reconstruction can be completed as soon as possible.

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