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From: Jim Paris <jim@jtan.com>
To: Mike Hardy <mhardy@h3c.com>
Cc: Kanoa Withington <kanoa@cfht.hawaii.edu>,
	Huntress Gary B NPRI <HuntressGB@Npt.NUWC.Navy.Mil>,
	"'linux-raid@vger.kernel.org'" <linux-raid@vger.kernel.org>
Subject: Re: High System Load
Date: Wed, 28 Jul 2004 20:17:33 -0400	[thread overview]
Message-ID: <20040729001732.GA18905@jim.sh> (raw)
In-Reply-To: <41083CB6.9070901@h3c.com>

> #!/bin/tcsh
> while 1
>   cat /proc/mdstat
>   sleep 1
>   clear
> end

.. or just 'watch cat /proc/mdstat' :)

> There's got to be something else happening on the machine...

I find that if the kernel variable dev.raid.speed_limit_max is too
high (the default, 200000, is usually too high), then the rebuild
could taking all available I/O time.  This can cause every other
process trying to do I/O on the machine to block, which may be the
reason your load average is so high.

Try doing 'sysctl -w dev.raid.speed_limit_max=10000' and see if things
improve.

-jim

      reply	other threads:[~2004-07-29  0:17 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-07-28 23:00 High System Load Huntress Gary B NPRI
2004-07-28 23:23 ` Kanoa Withington
2004-07-28 23:54   ` Mike Hardy
2004-07-29  0:17     ` Jim Paris [this message]

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