Problem and solution when the hot spare disk does not replace the faulty disk (without reconstruction)

You can perform the following operations when the hot spare disk does not replace the faulty disk (without reconstruction):
1. Fault location and rectification
a. When RAID 5 is configured, only one disk is allowed to be faulty in a disk domain at a time. If two disks are faulty, the RAID group fails.
b. The operations such as reconstruction, copyback, and precopy can only be performed in specified scenarios.
2. Solution
a. The failure is caused by a faulty RAID group.
If one disk in a RAID group is faulty, a hot spare disk is automatically related to the faulty disk (run the CLI commandshowdisk -l to check and find that the status of the hot spare disk is used). The faulty disk starts reconstruction.
During reconstruction, if another disk in the RAID group becomes faulty, the RAID group fails. The hot spare disk being used changes to free spare.
Recover the failed RAID group by referring to Troubleshooting RAID Group Failures. b. Precopy and reconstruction cannot be performed simultaneously.
In present storage devices, only one disk can perform reconstruction (copyback and precopy) at one time. Disk reconstruction must be performed through serial processing regardless of RAID groups.
Only two types of operations of different RAID groups can be processed concurrently, such as reconstruction and precopy, reconstruction and copyback, or copyback and precopy.

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