Method of configuring hot spares

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After hard drives of a server are configured into RAID arrays, hot spares are usually configured to improve security and reduce the impact of hard disk faults on services.
For details about how to configure hot spares, visit the following link: http://support.huawei.com/enterprise/docinforeader.action?contentId=DOC1000004186&idPath=7919749|9856522|21782478|21149952|21152124

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Method of configuring hot spares
After hard drives of a server are configured into RAID arrays, hot spares are usually configured to improve security and reduce the impact of hard disk faults on services.
For details about how to configure hot spares, visit the following link: http://support.huawei.com/enterprise/docinforeader.action?contentId=DOC1000004186&idPath=7919749|9856522|21782478|21149952|21152124

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.

Functions of hot spare disks
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.

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.

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