Functions of hot spare disks

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Definition and function of hot spare disks
During service running, a RAID group may fail or downgrade due to a disk enclosure's unexpected power outage or member disk removal by mistake, causing service data loss. To ensure the reliability of the storage system, you are advised to create hot spare disks after creating RAID groups. The hot spare disks can replace the faulty ones and data will be rebuilt to the hot spare.

Method used to set hot-spare disks
Prerequisite: The system has free disks. Precautions: You need to create hot spare disks to ensure the reliability of the storage device. For controller enclosures with integrated disks and controllers, the number of hot spare disks must not be smaller than the total number of controller enclosures and disk enclosures. For controller enclosures with separated disks and controllers, the number of hot spare disks in the storage system must not be smaller than the number of disk enclosures. The type and capacity of a hot spare disk must be the same as those of RAID group member disks. Note: If the storage system has additional free disks, you can set more hot spare disks for even higher system reliability. Currently, storage systems support global hot spare disks only, and you cannot assign a hot spare disk to a specific RAID group. Coffer disks cannot be used as hot spare disks. Only free disks can be set as hot spare disks. The procedures are as follows: In the ISM navigation tree, choose All Devices > SN_XX > Device Info > Storage Unit > Disks. (SN_XX is the name of the target storage device.) In the function pane of ISM, select disks that you want to set to hot spare disks. On the upper function pane of ISM, choose Hot Spare Disk > Set. The system displays the result of setting hot spare disks. Upon successful creation of hot pare disks, Logical Type of each selected hard disk changes to Hot Spare Disk. If the operation fails, select another available disk as the hot spare disk based on the error message. The results are as follows: After a hot spare disk is created, on the right function pane, the Running Status of the disk is Free Hot Spare Disk. When faulty member disks result in a RAID group failure, the created hot spare disk can take over the data stored on the faulty member disks to ensure normal operation of the RAID group. In this case, Running Status of the hot spare disk changes to Used Hot Spare Disk.

Replacement of a malfunctioning coffer disk with a hot spare disk
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.

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

After a hot spare disk is removed from and then reinserted into the storage system, can it be automatically set to a hot spare disk?
No. You need to log in to the ISM or the CLI to manually set the newly-inserted disk as the hot spare disk for the storage system.

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