On Thu, Aug 19, 2004 at 04:02:16AM -0500, Steve Phillips wrote: > > Software RAID comes with a preformance hit that with todays processors > you probably will never notice. > > RAID1 would be ok, if you are after rock solid redundancy then > purchase another drive as a hot spare (and if your really keen, try to > ensure that the drives are nto from teh same production batch) > Be aware however, that under heavy I/O, a failed disk may take a *really* long time to rebuild under software RAID. We saw >150MB/s using four SCSI drives under software RAID 5, but when testing rebuild speed, normal disk I/O caused the rebuild time to get pushed out towards infinity. It wouldn't have worked well in our situation so we went with a hardware RAID controller. Mike Wimpee > comments like "dont know if it is really effective" are kinda wishy washy, > effective against what ? was he saying that a single drive system would > have greater redundancy than a mirrored setup ? what sort of effect was he > commenting on ? > > the preformance hit you will see will also depend on how many users and > how busy you expect the server to be - also, buying 5400rpm drives will > probably not help much, try and get reasonably fast drives with a > reasonable ammount of cache ram. > > if you are after reliability only then there is no point to stripe > (infact, some people claim that software stripes actually slow things down > over say - RAID 10) > > > -- > Steve. > > On Thu, 19 Aug 2004, kenwardc wrote: > > >Hi All > > > >Someone said to me today they didn't know whether RAID on Linux was > >very effective. Can someone tell me whether it's still worth RAIDing > >drives on Linux? I'm building a new mail server and I wanted to put in > >RAID 1 just in case of problems with drives etc. down the line. Any > >advice appreciated. > > > >Also, provided the answer to the question is YES, is RAID 1 the best > >for a mail server or should I be looking at striping? I'm obviously > >not looking for the greatest speed but want absolutely reliable > >redundancy. > > > >Regards > >Chris > > > > > > > >--- > >All messages scanned by AVG 7.0 Anti-Virus scanner and TGIS Anti-Spam > >Firewall. > > > > > >-- > >redhat-list mailing list > >unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > >https://www.redhat.com/mailman/listinfo/redhat-list > > > > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
