On Fri, 2009-11-13 at 19:08 +0100, Julio Rodanes - KNET wrote: > The subsystem disk is a Adaptec 51645 RAID 5 with 3 disk ST31000340NS
Well, those are 7200 rpm 1TB SATA-II disks. In theory, they vary from ~55MB/sec to ~100MB/sec across the platters during linear operations, but RAID-5 does add overhead. The Adaptec card I would expect to be able to extract full performance from each drive on their own, but I have no idea Have you tried any benchmarks on the array both with and without DRBD to see what the native performance actually is? Preferably you'd test using striping and mirroring too so you get a feel for how much of an impact raid-5 is. Mark. -- Mark Watts BSc RHCE MBCS Senior Systems Engineer, Managed Services Manpower www.QinetiQ.com QinetiQ - Delivering customer-focused solutions GPG Key: http://www.linux-corner.info/mwatts.gpg
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