Replacement of a malfunctioning coffer disk with a hot spare disk

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A hot spare disk can replace a malfunctioning coffer disk if the two disks are of the same type and the hot spare disk provides a capacity equal to or larger than that of the coffer disk.

Other related questions:
Whether coffer disks of OceanStor T Series unified storage can be set to hot spare disks
Coffer disks of OceanStor T Series unified storage cannot be set to hot spare disks. This is because coffer disks store configuration data of the storage system, events, logs, and data in the cache when a PSU fails. Only idle disks in the normal state can be set to hot spare disks.

Can a coffer disk be replaced by the coffer disk in another controller enclosure?
No. Coffer disks are used to store important data for the storage system, including configuration data, event information, and log information. When the storage system encounters an unexpected power failure, data in cache is written onto coffer disks. Even the two controller enclosures are of the same manufacturer and type, data stored on their coffer disks is different; therefore, coffer disks in different controller enclosures cannot be interchanged.

Functions of hot spare disks
Whether hot spare disks of OceanStor T Series unified storage can be set to coffer disks
Hot spare disks of OceanStor T Series unified storage cannot be set to coffer disks.

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. Solution 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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