From: KELEMEN Peter <Peter.Kelemen@cern.ch>
To: linux-xfs@oss.sgi.com
Subject: Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)
Date: Tue, 25 Sep 2007 14:57:33 +0200 [thread overview]
Message-ID: <20070925125733.GA20873@luba.cern.ch> (raw)
In-Reply-To: <20070925123501.GA20499@p15145560.pureserver.info>
* Ralf Gross (ralf-lists@ralfgross.de) [20070925 14:35]:
> There is a second RAID device attached to the server (24x
> RAID5). The numbers I get from this device are a bit worse than
> the 16x RAID 5 numbers (150MB/s read with dd).
You are expecting 24 spindles to align up when you have a write
request, which has to be 23*chunksize bytes in order to avoid RMW.
Additionally, your array is so big that you're very likely to hit
another error while rebuilding. Chop up your monster RAID5 array
into smaller arrays and stripe across them. Even better, consider
RAID10.
Peter
--
.+'''+. .+'''+. .+'''+. .+'''+. .+''
Kelemen Péter / \ / \ Peter.Kelemen@cern.ch
.+' `+...+' `+...+' `+...+' `+...+'
next prev parent reply other threads:[~2007-09-25 13:09 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-23 9:38 mkfs options for a 16x hw raid5 and xfs (mostly large files) Ralf Gross
2007-09-23 12:56 ` Peter Grandi
2007-09-26 14:54 ` Ralf Gross
2007-09-26 16:27 ` [UNSURE] " Justin Piszcz
2007-09-26 16:54 ` Ralf Gross
2007-09-26 16:59 ` Justin Piszcz
2007-09-26 17:38 ` Bryan J. Smith
2007-09-26 17:41 ` Justin Piszcz
2007-09-26 17:55 ` Bryan J. Smith
2007-09-26 17:13 ` [UNSURE] " Bryan J. Smith
2007-09-26 17:27 ` Justin Piszcz
2007-09-26 17:35 ` Bryan J. Smith
2007-09-26 17:37 ` Justin Piszcz
2007-09-26 17:38 ` Justin Piszcz
2007-09-26 17:49 ` Bryan J. Smith
2007-09-27 15:22 ` Ralf Gross
2007-09-24 17:31 ` Ralf Gross
2007-09-24 18:01 ` Justin Piszcz
2007-09-24 20:39 ` Ralf Gross
2007-09-24 20:43 ` Justin Piszcz
2007-09-24 21:33 ` Ralf Gross
2007-09-24 21:36 ` Justin Piszcz
2007-09-24 21:52 ` Ralf Gross
2007-09-25 12:35 ` Ralf Gross
2007-09-25 12:50 ` Justin Piszcz
2007-09-25 13:44 ` Bryan J Smith
2007-09-25 12:57 ` KELEMEN Peter [this message]
2007-09-25 13:49 ` Ralf Gross
2007-09-25 14:08 ` Bryan J Smith
2007-09-25 16:07 ` Ralf Gross
2007-09-25 16:28 ` Bryan J. Smith
2007-09-25 17:25 ` Ralf Gross
2007-09-25 17:41 ` Bryan J. Smith
2007-09-25 19:13 ` Ralf Gross
2007-09-25 20:23 ` Bryan J. Smith
2007-09-25 16:48 ` Justin Piszcz
2007-09-25 18:00 ` Bryan J. Smith
2007-09-25 18:33 ` Ralf Gross
2007-09-25 23:38 ` Justin Piszcz
2007-09-26 8:23 ` Ralf Gross
2007-09-26 8:42 ` Justin Piszcz
2007-09-26 8:49 ` Ralf Gross
2007-09-26 9:52 ` Justin Piszcz
2007-09-26 15:03 ` Bryan J Smith
2007-09-26 15:15 ` Ralf Gross
2007-09-26 17:08 ` Bryan J. Smith
2007-09-26 16:24 ` Justin Piszcz
2007-09-26 17:11 ` Bryan J. Smith
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