From: "Kristleifur Daðason" <kristleifur@gmail.com>
To: Jon@ehardcastle.com
Cc: linux-raid@vger.kernel.org
Subject: Re: Raid 5 to 6 reshape q
Date: Sat, 2 Jan 2010 12:19:44 +0000 [thread overview]
Message-ID: <73e903671001020419x47a07e69ucb5a01b99dc1fc03@mail.gmail.com> (raw)
In-Reply-To: <625563.35920.qm@web51308.mail.re2.yahoo.com>
On Sat, Jan 2, 2010 at 8:52 AM, Jon Hardcastle <jd_hardcastle@yahoo.com> wrote:
> Hi guys, thanks for your help getting me going with this over the last week. I kicked it off last night and all is well.
> ...
> The only Q i have is it seems to be abit slow?
> ...
> md4 : active raid6 sdg1[4] sdf1[0] sde1[1] sdd1[2] sdc1[5] sdb1[3] sda1[6]
> 2441919680 blocks super 0.91 level 6, 64k chunk, algorithm 18 [7/6] [UUUUUU_]
> [===>.................] reshape = 17.9% (87600896/488383936) finish=2881.3min speed=2317K/sec
That's very slow. An order of magnitude too slow in my view. I was
initially seeing speeds like this during my recent reshape, but got it
up to around 30MBps. I can't recall exactly what I did to get it
running better - it was the equivalent of giving the television a good
whack - but I seem to recall that increasing the md stripe cache size
helped the most.
I don't currently have access to my work computer where the command
history lives, so this is all I have for now. If I find anything more
to try, I'll chime in.
-- Kristleifur
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next prev parent reply other threads:[~2010-01-02 12:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-02 8:52 Raid 5 to 6 reshape q Jon Hardcastle
2010-01-02 12:08 ` John Robinson
2010-01-02 12:19 ` Kristleifur Daðason [this message]
2010-01-03 18:07 ` Jon Hardcastle
2010-01-03 20:14 ` Billy Crook
2010-01-03 20:34 ` Peter Rabbitson
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