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From: "Keld Jørn Simonsen" <keld@dkuug.dk>
To: linux-raid@vger.kernel.org
Subject: performance problems with raid10,f2
Date: Sat, 15 Mar 2008 00:11:51 +0100	[thread overview]
Message-ID: <20080314231151.GA14568@rap.rap.dk> (raw)

Hi

I have a 4 drive array with 1 TB Hitachi disks, formatted as raid10,f2

I had some strange observations:

1. while resyncing I could get the raid to give me about 320 MB/s in
sequential read, which was good. After resync had been done, and with
all 4 drives active, I only get 115 MB/s.

2. while resyncing, the IO rate on each disk is about 27 MB/s - and the 
rate of each sdisk is about 82 MB/s. Why is this?

best regards
keld

             reply	other threads:[~2008-03-14 23:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-14 23:11 Keld Jørn Simonsen [this message]
2008-03-20 17:28 ` performance problems with raid10,f2 Keld Jørn Simonsen
2008-03-25  5:13   ` Neil Brown
2008-03-25 10:36     ` Keld Jørn Simonsen
2008-03-25 13:22       ` Peter Grandi
2008-04-02 21:13         ` Keld Jørn Simonsen
2008-04-03 20:20           ` Peter Grandi
2008-04-04  8:03             ` Keld Jørn Simonsen
2008-04-05 17:31               ` Peter Grandi
2008-04-05 18:46                 ` Keld Jørn Simonsen

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