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Re: Does XFS prevent disk spindown?

To: Thor Kristoffersen <thorkr@xxxxxxxxx>
Subject: Re: Does XFS prevent disk spindown?
From: David Chinner <dgc@xxxxxxx>
Date: Tue, 1 Apr 2008 10:30:05 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <m2tzimbvif.fsf@xxxxxxxxxx>
References: <m2tzimbvif.fsf@xxxxxxxxxx>
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On Mon, Mar 31, 2008 at 08:26:00PM +0200, Thor Kristoffersen wrote:
> I've noticed that when I spin down XFS-mounted disks they spin up again
> shortly afterwards.  I used iostat to monitor disk accesses to a mounted
> partition (with noatime) in single user mode.  Apparently there is a write
> access to the partition approximately every 35 seconds, even if the
> partition is idle.  As far as I can understand, since there is no data that
> needs to be flushed this must be done by an XFS daemon for some purpose.
> Is there any setting or mount option I can use to get rid of this behavior?
> I know I can freeze the filesystem, but then I have to remember to unfreeze
> it every time I need to write to it, so it's not an ideal solution.

Turn on laptop mode?


Dave Chinner
Principal Engineer
SGI Australian Software Group

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