RAID 2.0 uses independent hot spare disks or not

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RAID 2.0 automatically reserves a certain amount of hot spare space in the disk domain according to the hot spare policy. Therefore, independent hot spare disks do not need to be specified. Please note that cross-engine hot spare space is not supported.

Other related questions:
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
Number of failed disks allowed by RAID 2.0+
The number of failed disks allowed by RAID 2.0+ depends on the RAID level. RAID 3 and RAID 5 only allow one disk to fail. RAID 6 and RAID 50 only allow two disks to fail. RAID 10 only allows N disks to fail (RAID 10 is composed of 2 x N disks).

Whether hot spare disks can be specified for specific RAID groups on T series unified storage systems
On OceanStor T Series V100R005 storage systems, hot spare disks cannot be specified for a specific RAID group.

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

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