On Mon, 2005-08-01 at 07:10 -0700, [EMAIL PROTECTED] wrote: > On Mon, Aug 01, 2005 at 01:16:49PM +0200, Marius Schrecker wrote: > > I would also love to know how to get this to work in Linux. It's not so > > much putting the disk to sleep as keeping it there. I've never managed to > > get a HD to powerdown (using hdparm) for more than half a second without > > being woken up again. :( > > If you are using a journalled filesystem (virtually anything other than > ext2) then you need to mount using the noatime option so that the > journal flushes don't trigger atime updates.
The advice here is fine - mounting noatime reduces the writes that are generated to the disk (and in many cases people will never ever notice that atime is missing - its a relatively specialised requirement). However this has nothing to do with journalling. The journal is outside the filesystem (even on very old ext3 where the journal exists as a special visible file the atime updates didn't apply to it), so journalling does not affect atime flushes. However there is a load of standard system activity which will result in (say) a read of the (buffer cached) root directory of a filesystem - this is a read of the directory so now the directory atime has to be updated, resulting in a disk write. Thats why turning atime off is a good idea for machines that wish to power down the disks. Nigel. -- [ Nigel Metheringham [EMAIL PROTECTED] ] [ - Comments in this message are my own and not ITO opinion/policy - ]
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