RAID on RedHat 3 ES

[kenwardc]

Hi Mike

Yep - the box is a Dell 1650 with Perc3 RAID on daughterboard so
should be good for building the spare.

Drives will be around 2 x 36 Gbyte so not too huge either.

Regards
Chris

> -----Original Message-----
> From: redhat-list-bounces at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Michael Wimpee
> Sent: 19 August 2004 18:39
> To: General Red Hat Linux discussion list
> Subject: Re: RAID on RedHat 3 ES
>
> 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
> > >
> > >
> > >
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