Whether hot spare disks can be specified for specific RAID groups on T series unified storage systems

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On OceanStor T Series V100R005 storage systems, hot spare disks cannot be specified for a specific RAID group.

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.

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.

Rules for configuring the hot spare disk policy for OceanStor T unified storage systems
For OceanStor T Series V100R005 storage systems, hot spare disks must be configured to ensure the reliability of the storage system. The rules for hot spare disk configuration are as follows: 1. For the controller enclosure that employs disk and controller integration, the number of hot spare disks must not be smaller than the total number of controller enclosures and disk enclosures. For the controller enclosure that employs disk and controller separation, the number of hot spare disks in the storage system must not be smaller than the number of disk enclosures. 2. The type and capacity of a hot spare disk must be the same as those of RAID group member disks. 3. Currently, storage systems support global hot spare disks only, and you cannot assign a hot spare disk to a specific RAID group. 4. Coffer disks cannot be used as hot spare disks. 5. Only free disks can be set as hot spare disks. If the storage system has additional free disks, you can set multiple hot spare disks for higher system reliability.

Whether coffer disks of OceanStor T/V3 series unified storage can be configured as RAID or member disks
Coffer disks of unified storage store the configuration data of the storage system, events, logs, and dirty data. Remaining capacity of coffer disks can be used to store storage service data. Coffer disks can be added to RAID groups as member disks.

RAID levels supported by OceanStor T Series unified storage systems
OceanStor T Series V100R005 unified storage systems support RAID 0, RAID 1, RAID 3, RAID 5, RAID 6, RAID 10, and RAID 50.

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