On Thu, Oct 18, 2007 at 12:09:18PM +0300, Stefan Lambrev wrote: > May be I have wrong impression that mirror should increase read speed > almost twice compared to > single disk, but I forget that bonnie++ was run as single thread. > May be if I start it with concurrency=2 then I'll see the real performance > of the mirror ? > Or should I move to the thread to performance_at_ :) The easiest way for me to describe it would be to refer you to the Wikipedia article. See the section "Other benefits of mirroring": http://en.wikipedia.org/wiki/Disk_mirror Generally speaking, RAID 1 sequential read across 2 disks should be slightly higher than the same disk in a JBOD configuration -- keyword is "slightly". RAID 0 (striping) is what gives you the immense improvement, but I'm sure you know how risky RAID 0 is... -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |Received on Thu Oct 18 2007 - 07:15:31 UTC
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