From: Anssi Hannula <anssi.hannula@gmail.com>
To: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: Recovery speed at 1MB/s/device, unable to change
Date: Mon, 24 Apr 2006 01:48:39 +0300 [thread overview]
Message-ID: <444C0447.4040200@gmail.com> (raw)
In-Reply-To: <17483.63636.745420.456281@cse.unsw.edu.au>
(sorry, prev post missed the list)
Neil Brown wrote:
> On Monday April 24, anssi.hannula@gmail.com wrote:
>
>># mdadm --grow /dev/md_d1 --raid-devices=3 --backup-file backupfile
>>mdadm: Need to backup 128K of critical section..
>>mdadm: /dev/md_d1: Cannot get array details from sysfs
>>
>>Strace shows that it's trying to access
>>"/sys/block/md_d4/md/component_size".
>>
>>Why is this?
>
>
> Because I didn't test my code properly :-(
>
> Following patch should fix it.
Okay, will test.
> Re: the recovery speed problem: I would try dding from one drive to
> the other and see what sort of speed you get then:
> dd if=/dev/sda of=/dev/sdb bs=1024k count=1000
> or something like that.
# export LANGUAGE=C; export LANG=C; export LC_ALL=C; date; dd
if=/dev/sda skip=20000 of=/dev/sdb bs=1024k count=1000; date
Mon Apr 24 01:14:48 EEST 2006
1000+0 records in
1000+0 records out
Mon Apr 24 01:15:42 EEST 2006
So the speed is about 20MB/s.
--
Anssi Hannula
next prev parent reply other threads:[~2006-04-23 22:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-23 19:22 Recovery speed at 1MB/s/device, unable to change Anssi Hannula
2006-04-23 21:37 ` Anssi Hannula
2006-04-23 21:58 ` Neil Brown
2006-04-23 22:48 ` Anssi Hannula [this message]
2006-04-23 22:49 ` Anssi Hannula
2006-04-24 13:33 ` Anssi Hannula
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