On Fri, Jan 20, 2012 at 8:58 PM, Jeffrey J. Kosowsky
<[email protected]>wrote:
> Till Hofmann wrote at about 16:23:56 +0100 on Friday, January 20, 2012:
> > Hello everybody,
> >
> > since my backup partition is on a RAID5 which doesn't do anything but
> > keeping my backups, I want the hard drives to automatically spin down
> > (standby) when there is nothing to do.
> > It's working properly, I only have one problem: backuppc writes to the
> > per-pc log file in $topdir/pc/$host/LOG.**** every times it wakes up and
> > tries to ping (or nmblookup) that host.
> > It does nothing but writing one line in the log file that it couldn't
> reach
> > the host.
> >
> > As I'm trying to save energy and protect my hard drives from too many
> spin
> > downs/spin ups, I want to prevent these unnecessary spin ups. I already
> > moved the general log file to a different hard drive, but there is no
> > option to move the per-pc log file (or I haven't found it).
>
> Are you really concerned about O(24) spin-ups per day? I wouldn't
> think that a once an hour spin-up would add much to the wear-and-tear
> on your drive. And if you are worried about energy, just decrease the
> time to spin-down to say 1 minute. That will save more than 98% of the
> spin energy... Plus if you have multiple machines to back up you are
> probably spreading the backup load across much of the day anyway...
>
No, I'm not concerned about 24 spin-ups a day, but if the spin-down time is
set to let's say 20 minutes, I know it's not going to spin up more than 72
times a day.
>
> All that being said, preventing the logging still likely won't prevent
> the hourly wake-up spin-up (at least in the absence of caching) since
> at each wake up, BackupPC looks at the pc tree to determine aging of
> backups... And reading spins up the disks as much as writing...
>
>
I didn't think BackupPC looks at the pc tree (e.g. it can tell me how old
the last backup is without spinning up the disks) but I guess that makes it
impossible to prevent the spin-up. I set it to a 5-minute spin-down (and
therefore losing the safety that my disks cannot spin down more than 3
times per hour) as you suggested. That looks like the best solution to me
now..
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