Re: How to prevent LVM disk spinup at shutdown

[Nate Duehr <nate@natetech.com>]

On Aug 8, 2007, at 2:54 AM, Gilles Mocellin wrote:

> Le Wednesday 08 August 2007 09:44:16 Malte Forkel, vous avez écrit :
> > Hi,
> >
> > I use a couple of LVM volumes on a MD RAID1 array for backup.  
> > These volumes
> > are rarely accessed, so I use hdparm to switch the RAID disks into  
> > standby
> > mode.
> >
> > I noticed that the disks are forced to spin up whenever the the  
> > system
> > shuts down. What is causing the spin up? Is there a way to avoid  
> > this?
> >
> > Thanks, Malte
>
> I have the same "problem" with my external USB drive, used for  
> backups.
>
> It wakes up when the filesystem is umounted, because the cache must be
> flushed.
>
> Perhaps, should we mount and unmount the filesystem each time my  
> backups
> runs...

It's also marking the filesystem as having a clean shutdown, so fsck  
doesn't try to fix it on next boot.  There's no way around it unless  
you want to bypass that and wait through an fsck during the next boot.

In other words, it's not a bug, it's actually doing something --  
something that has to be done.  It's a feature.  :-)

--
Nate Duehr
nate@natetech.com