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hdparm command usage example

hdparm command should be executed with root privileges. The following is an example for cached read and buffered disk read.

# hdparm -Tt /dev/mapper/mpath1

/dev/mapper/mpath1:
Timing cached reads: 2832 MB in 2.00 seconds = 1415.46 MB/sec
Timing buffered disk reads: 74 MB in 3.10 seconds = 23.85 MB/sec

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