How can I get more details about my disk status?

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The command iostat can display the I/O performance and status, but sometimes the administrators needs to provide more information about the disk status. In such cases the file /proc/diskstats can be helpful. Below is a example of /proc/diskstats after issuing cat /proc/diskstats:

# cat /proc/diskstats
1 0 ram0 0 0 0 0 0 0 0 0 0 0 0

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