Re: RAID-3? (was: cvs commit: src MAINTAINERS)

From: Pawel Jakub Dawidek (pjd_at_FreeBSD.org)
Date: 08/21/04

  • Next message: Pawel Jakub Dawidek: "Re: RAID-3? (was: cvs commit: src MAINTAINERS)" 
    Date: Sat, 21 Aug 2004 10:33:55 +0200
To: Greg 'groggy' Lehey <grog@FreeBSD.org>

    On Sat, Aug 21, 2004 at 05:58:38PM +0930, Greg 'groggy' Lehey wrote:
    +> So these are two disks + parity, right? That's not exactly a typical
    +> setup.

    Yes.

    +> > RAID5:
    +>
    +> What was the RAID-5 stripe size?

    256kB.

    +> > As you can see RAID5 is only faster in READ tests for 15 and 100 processes
    +> > working in parallel. As I can see, RAID3 is faster in all the rest tests.
    +>
    +> I don't really see enough to convince me either way. If you use small
    +> RAID-5 stripes, then yes, it's possible to get better performance from
    +> RAID-3. I'd also suggest that your figures would look very different
    +> with five or nine disks. It would also be interested to see the
    +> results of rawio on these configurations, and also the relative
    +> performance of a single disk.

    Ok, wait for my reading optimization results:) 

    -- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd@FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!

  • Next message: Pawel Jakub Dawidek: "Re: RAID-3? (was: cvs commit: src MAINTAINERS)"

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