From: Michael <michael@rw23.de>
To: Bill Davidsen <davidsen@tmr.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Slow(?) raid5 to raid6 reshape speed
Date: Tue, 16 Feb 2010 20:11:13 +0100 [thread overview]
Message-ID: <8d1abe44b332189eb67b55af57b4ba94@rw23.de> (raw)
In-Reply-To: <4B7AD738.6080503@tmr.com>
On Tue, 16 Feb 2010 12:34:48 -0500, Bill Davidsen <davidsen@tmr.com>
wrote:
> Michael wrote:
>> setting the stripe_cache to 8192 or something did not show a real
>> performance gain.
>>
>>
> You can go larger than that, double it or try 32k. I have heard reports
> of evil at 64k, I wouldn't go there other than with test data.
well, my "evil" value is at 32k, crashed my system to a unuseable state.
could be related to my 4gb memory in a 32bit system. i think people with 64
bit can go higher.
something from my logfile can be read here if it is interesting:
http://pastebin.ca/1798794
my x server crashed, and i was not able to do anything anymore related to
the raid device.
i.e. echo 1024 > /sys/block/md2/md/stripe_cache_size hangs, also cat
/proc/mdstat.
was a nice crash that stopped my heart for some seconds. thanks to neil
for making "resuming" of reshape processes possible.
prev parent reply other threads:[~2010-02-16 19:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-16 11:50 Slow(?) raid5 to raid6 reshape speed Michael
2010-02-16 11:53 ` Mikael Abrahamsson
2010-02-16 12:18 ` Michael
[not found] ` <alpine.DEB.1.10.1002161334170.4986@uplift.swm.pp.se>
2010-02-16 13:31 ` Michael
2010-02-16 17:34 ` Bill Davidsen
2010-02-16 19:11 ` Michael [this message]
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