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Re: Disk spin down

To: Brian Candler <B.Candler@xxxxxxxxx>
Subject: Re: Disk spin down
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 14 Feb 2012 10:41:29 +1100
Cc: Andy Bennett <andyjpb@xxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20120213083651.GA40007@xxxxxxxx>
References: <4F3803B1.1090205@xxxxxxxxxxxxxx> <20120213083651.GA40007@xxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Feb 13, 2012 at 08:36:51AM +0000, Brian Candler wrote:
> On Sun, Feb 12, 2012 at 06:23:45PM +0000, Andy Bennett wrote:
> > Can someone help me work out where writes are coming from on my system?
> Is the filesystem in question mounted with 'relatime' or 'noatime'?
> Otherwise, merely reading a file will cause its inode to be dirtied.
> (However in modern kernels, 'relatime' might be the default, I'm not sure)

relatime has been the default for quite some time, and even before
relatime was implemented in the VFS, xfs implementated atime updates
in a manner almost indistinguishable from relatime since about 2007....


Dave Chinner

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