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List:       toasters
Subject:    RE: raidsize recommendations
From:       avarni () cj ! com
Date:       2004-10-22 18:34:55
Message-ID: Pine.LNX.4.61.0410221128420.8053 () null ! 3xt ! org
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Which is one reason why diagonal parity seems attractive to me. I have raid
rebuild priority set to 'highest' currently because I don't want
to trade performance for an ncreased risk of data loss.  If we were
using raid_dp, however, I could probably get away with turning rebuild
priority to low (at least for a single disk failure), and hopefully
maintain adequate performance during our peak hours even with a degraded
volume.  Don't have enough free disks to try this now, however. :(



On Thu, 21 Oct 2004, Derek Lai wrote:

> The last administrator setup our production database to use 2 X 13 disk raid
> groups. It worked ok for about 1.5 years. However, I recently was
> re-organizing and decided to be safer and went to 3 X 9 disk raid groups.
>
> Besides taking longer to rebuild, the performance during rebuild was a big
> issue to me - we were already pounding the disks very hard, with disk
> utilization going to over 90% utilization frequently. If a disk goes out
> during peak hours, performance could degrade very substantially and it is
> just a problem that I do not need. So take that into consideration as well.
>
>
> Derek
>
> -----Original Message-----
> From: Tavis Gustafson [mailto:tavis@hq.newdream.net]
> Sent: Thursday, October 21, 2004 12:29 PM
> To: toasters@mathworks.com
> Subject: raidsize recommendations
>
>
> I usually setup my filers with raidsize=7 having no more than 7 disks
> per volume. However, I would like create a  raidsize=13 volume.  The
> only risk i can glean from NOW is that rebuild time will increase and
> thus increase the chances of a second drive failure (during rebuild).
>
> Has anyone had any real world issues with using volumes of raidsize > 10
>
> thanks,
> -Tavis
>
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