Disk spin-down and restoring spin-down disks in a RAID group

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Disk spin-down enables disks that are free of I/O operations to spin down by software control. Then the disk motors and heads stop rotating, but the power supply to the disks remains normal.
You can use either of the following methods to restore spin-down disks:
1. Perform read and write operations on the spin-down disks.
2. On the ISM, disable the spin-down function for the desired RAID group. The detailed operations are as follows:
a. On the ISM, choose Storage Resource > RAID.
b. In the function pane on the right, select the desired RAID group and choose Advance > Set Spin-down.
c. In the displayed Set Spin-down dialog box, select Forbidden.

Other related questions:
Method used to create RAID groups on the existing disks
You can create RAID groups on the existing disks as follows: 1. During RAID capacity planning, you must plan the RAID group level. When determining the RAID level, the following must be considered: reliability, performance, and disk utilization. 2. You must also plan the number of member disks in the RAID group. That is, you must meet requirements on the number of member disks at different RAID levels.

Minimum number of disks required by each RAID
RAID 0 requires at least one disk, RAID 1 at least two disks, RAID 3 at least three disks, RAID 5 at least three disks, RAID 6 at least four disks, RAID 10 at least four disks, and RAID 50 at least six disks.

Method used to migrate data on one disk of a RAID group to other disks in the storage system
You can migrate data on one disk of a RAID group to other disks in the storage system as follows: When the disk status is Normal and you must migrate data on the disk to a hot spare disk, manually change the disk. Run the CLI command startdiskswap to migrate data on the faulty disk to a hot spare disk in the following format: startdiskswap -se faulty disk enclosure ID -ss faulty disk slot ID -te target disk enclosure ID -ts target disk slot For example, migrate data on the disk (1, 23) to the hot spare disk (1, 20) by running the following command: startdiskswap -se 1 -ss 23 -te 1 -ts 20

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.

Whether OceanStor T Series RAID groups can be expanded
1. On OceanStor T Series V100R005 storage systems, you can add disks to the original RAID group online. 2. The traditional capacity expansion is implemented by creating more RAID groups. In this case, the complexity of managing storage resources increases when capacity expansion becomes frequent. The dynamic RAID group expansion is to add new disks to the target RAID group, and instruct the storage device to incorporate the capacity of those disks arranged in a unified stripe depth with the LUNs in the RAID group. This method can increase the storage capacity without changing the number and configuration of RAID groups.

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