Method used to identify slow disks in the storage system

Method used to identify slow disks in the storage system:
Slow disks refer to disks with poor performance in the storage system. Slow disks deteriorate the performance of the RAID group where the slow disks reside, or even the performance of the whole service system. To ensure stable performance of the storage system, you can perform the following steps to identify slow disks and replace them:
1. Log in to the storage device using the command line mode and enter the debug mode.
For OceanStor S2600 V100R001, S5000 V100R001, S2600 R5C02, and S5000R5C02 storage, after specifying the user name and password, run debug to enter the debug mode in the CLI.
For S5500T, S5600T, S5800T, S6800T, S3900, S5900, and S6900 storage systems, specify ibc_os_hs as the user name and Storage@21st as the password to enter the debug mode in the CLI.
2. Run iostat to check the disk usage, service time on each I/O, average waiting time of I/O requests, and the quantity of I/Os to be processed.
Note:
If values of the quantity of I/Os to be processed, average waiting time of I/O requests, service time on each I/O, and disk usage of a disk are greater than other disks, this disk is a slow disk.

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