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