On Sun, 23 Mar 2008, Ralph Angenendt wrote: > Kieran Clancy wrote: >> When I do tests though, I find that the md raid1 read performance is >> no better than either of the two disks on their own > > Why should RAID1 be faster than writing to/reading from a single disc? > You are *mirroring* each write to another disk, so I'd even expect it to > be slower. Read performance would be better if there are multiple accessors, but not for just a single stream. The hdparm test is not good in this case; Kieran sees exactly what is suspected. Try running it twice (at the same time). Steve ---------------------------------------------------------------------------- Steve Thompson E-mail: smt AT vgersoft DOT com Voyager Software LLC Web: http://www DOT vgersoft DOT com 39 Smugglers Path VSW Support: support AT vgersoft DOT com Ithaca, NY 14850 "186,300 miles per second: it's not just a good idea, it's the law" ----------------------------------------------------------------------------