Whether a RAID group can be created when the capacity of member disks is different

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Whether a RAID group can be created when the capacity of member disks is different:
Yes.
Total capacity of a RAID group = Minimum capacity of member disks in a RAID group x Quantity of member disks
Therefore, if disks with different capacity are selected as member disks in a RAID group, the storage space of member disks may be wasted. It is recommended that disks with the same capacity be selected to create a RAID group.

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.

Whether hard disks of different capacities can be used together
Hard disks of different capacities can be used together on a server. However, it is not recommended that hard disks of different capacities be put in the same RAID group.

Method used to calculate RAID capacity
If the number of RAID member disks is N (excluding hot spare disks), available capacity of RAID 0 = N x disk capacity. Available capacity of RAID 1 = N x Disk capacity/Number of mirror groups Available capacity of RAID 3 = (N-1) x Disk capacity Available capacity of RAID 5 = (N-1) x Disk capacity Available capacity of RAID 6 = (N-2) x Disk capacity Available capacity of RAID 10 = N x Disk capacity/Number of mirror groups Available capacity of RAID 50 = (N-2) x Disk capacity

Method of calculating the available capacity before configuring RAID
1. You can view the available capacity during RAID array configuration. 2. You can also estimate the ? RAID 0: 100% ? RAID 1: 50% ? RAID 5: (N-1)/N ? RAID 6: (N-2)/N ? RAID 10: 50% ? RAID 1E: (N+1)/2N ? RAID 50: (N-M)/N ? RAID 60: (N-M*2)/N N indicates the number of member hard disks in a RAID array. M indicates the number of sub-groups of a RAID array. For example, if three 300 GB disks are used to create a RAID 5 array, Disk usage rate: (3-1)/3 = 2/3 Available capacity of the RAID 5 array: 3 x 300 x 2/3 = 600 GB

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.

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