How to troubleshooting whether there is impact performance of failure hard disk in storage system (slow)?
A. under CLI check RAID LUN state, whether if it is abnormal
B. in storage debug mode, through the command of iostat -x -d 1 to check IO of storage system, the average service time of some disk (svctm) over a period of time is obviously more than other disk, %util is close to 100%, and other disk are free, can judge the hard disk performance
C. on host side check LUN IO state under multipath
D. check the link state in host side and ISM storage interface
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