Recommended hot spare policy for disk domains of the OceanStor V3 storage

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The high hot spare policy is recommended for disk domains of the OceanStor V3 storage.

Other related questions:
Recommended number of disks in each disk domain of the OceanStor V3 storage
Each tier under each disk domain has a maximum of 50 disks. Each disk domain has fewer than 100 disks.

Rules for configuring the hot spare policy for OceanStor V3 unified storage systems
For OceanStor V300R001 storage systems, proper hot spare policies must be configured to ensure the reliability of the storage system. For details about planning the hot spare policy, see Planning the Capacity .

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 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.

Principles and impact of expanding disk domains of OceanStor V3 storage systems
After the new disks are added to a disk domain, the system automatically performs migration to ensure that the used capacity of each disk is the same. The migration speed is related to the load of the disk domain. For example, if the I/O load on the disk domain is heavy, the migration speed is reduced; if the I/O load on the disk domain is light, the migration speed is relatively high. The migration speed has no major impact on the performance of a disk domain. However, it is still recommended to perform migration when the service load is light.

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