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I got a server with software RAID1 and two identical HDDs. Using hdparm -tT I get sligthly different results, one gives me 100Mb/s and the other one 97Mb/s. Is this difference tolerable in this configuration?

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up vote 2 down vote accepted

There are so many factors that can affect drive performance, that variability with results from testing is imminent. A 3Mb/s difference between the results is hardly worth worrying about. Just as proof, for the SU blog I'm conducted HDD tests and here are some results:

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as you can tell, there are differences in speeds, using the same program and same drive, with no other applications running.

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