On Wed, Jul 15, 2009 at 8:57 PM, Mark Hahn <h...@mcmaster.ca> wrote: > if you can't saturate gigabit with very modest raids, > you're doing something wrong. a single ultra-cheap disk > these days (seagate 7200.12 500G, $60 or so) will hit close to 135 MB/s on > outer tracks and average > 105 over > the whole disk. I'm guessing that you're losing performance > due to either bad controllers (avoid HW raid on anything that's not fairly > recent) or a combination of raid6 and a write-heavy workload...
Mark in a recent discussion recommends avoiding HW RAID. I am not exactly sure what the caveat is about. Does this mean that software RIAD under Linux outperform a dedicated RAID controllers? I was speccing out a DAS box with a storage server. The storage server had external RAID cards supposed to work with the SAS disks in the box. Is this a config to be frowned upon? Maybe I am misreading Mark's caveat. Any comments? -- Rahul _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
