On Thursday, 03.08.2006 at 07:30 -0400, Justin Piszcz wrote: > >I have 2 disks in RAID 1 and I expected reading will be approx. 2x > >faster then a single disk reading because there can be used the same > >technique as on RAID 0. I tested it with bonnie++. Can linux SW RAID > >1 read "in stripes" to boost the reading performance? > > From my benchmarking on my RAID1 (dual raptor RAID1) it appears it > reads from one drive or the other. It all depends on which disk controllers you're using and their throughput. I have two, separate SATA disks on two different SATA controllers and read performance in a RAID-1 configuration *is* (nearly) twice that of a single disk, in many situations. I think I've got the benchmark statistics somewhere... If "it appears it reads from one drive or the other" is the case, then you probably have a bottleneck somewhere else. Are these disks on the same controller channel? Dave. -- Please don't CC me on list messages! ... Dave Ewart - davee@sungate.co.uk - jabber: davee@jabber.org All email from me is now digitally signed, key from http://www.sungate.co.uk/ Fingerprint: AEC5 9360 0A35 7F66 66E9 82E4 9E10 6769 CD28 DA92
Attachment:
signature.asc
Description: Digital signature