Method used to plan performance of the RAID group

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You can plan the RAID group performance as follows:
Different RAID levels of vary in the following items:
1. Read and write performance.
2. Disk utilization.
3. Application scenarios.
When selecting a RAID level for specific applications, consider performance, data amount to be stored, and disk utilization.
The following conclusions can help in selecting RAID levels:
a. If you do not consider the redundant data, RAID 0 has the best read and write performance.
b. If you require data redundancy and good system performance regardless of disk costs, RAID 1 or RAID 10 can be optimal choices.
c. If you require redundant data, good system performance, and cost-effective disks, RAID 3, RAID 5, RAID 6, and RAID 50 can be optimal choices.

Other related questions:
Method used to plan reliability of the RAID group
You can plan the RAID group as follows: After a RAID group is created in the storage system, data is stored in the member disks of the RAID group. The mirroring and parity check functions of a RAID group provide reliable data recovery mechanisms if the member disks in a RAID group fail.

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.

RAID group
The definition of a RAID group is as follows: A single physical disk cannot meet requirements of a large amount of data storage and data security. A RAID group serves as a large logical disk that comprises independent physical disks of the different RAID levels, providing larger storage space. Different RAID levels meet data security requirements in different application scenarios.

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

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

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