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Re: Lost file-system story

On Wed, Dec 07, 2011 at 10:21:14AM +1100, Simon Burge wrote:
> David Holland wrote:
> > There is at least one known structural problem where atime/mtime
> > updates do not get applied to buffers (but are instead saved up
> > internally) so they don't get written out by the syncer.
> > 
> > We believe this is what causes those unmount-time writes, or at least
> > many of them.
> I understand the delayed atime writes were to added to reduce the number
> of times a laptop harddisk spins up.  I've often wondered if a simple
> sysctl could be added to control this.
> Unmounting my /home on my main machine takes approximately a minute.  My

Seconded. On a ftp server with a large filesystem (5TB, 5M inodes), shutdown
takes a very long time too.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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