Re: Lost file-system story

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

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 <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--