[CentOS] Being Green, Time to make the servers sleep!
heller at deepsoft.com
Thu Mar 19 13:58:31 UTC 2009
At Thu, 19 Mar 2009 12:54:41 +0100 CentOS mailing list <centos at centos.org> wrote:
> James Bensley wrote:
> > Shadies and Mentlemen;
> > I am trying to be green and put our backup servers to sleep during the
> > day and have them wake on LAN and fire back up at night for our
> > nightly backups as "sleep" is a sort of low power usage mode.
> > (At this point I would be curious to know the different levels of
> > sleep, what can I achieve? Does my server just drop into a low power
> > state, or can I stop the hard drives as well?)
> > I am wondering if it is achievable to script the process of putting a
> > server to sleep so I can cron tab its behind!
> > I would assume it would be possible but I don't know how, does anyone
> > have any idea?
> You are probably best of putting your backup server on an already
> running server as a virtual machine. If you really have only one server
> running on your lan then you could also consider the following approach.
> I use the power-on-time BIOS feature most MB have. My server start
> itself every night at 01:55. It is then up and running just before
> 02:00. At 02:00 I schedule a cron job to do the backup. At the end of
> the backup, the script just powers off the machine. The only thing to
> experiment with is the time it takes to start the machine. Sometimes the
> startup takes longer if disks need to be checked (ext3, every so may
> boots) and the cron might not trigger. Using anacron is perhaps the
> safest option in this case, but I did not experiment with that.
> I could not use wake up on LAN, since the mirror is on a remote location
> were it is really the only server.
You can also do a 'pull' backup -- the backup server runs the backup
job, not the 'active' server(s). In this case, instead of cron jobs on
the active machines, you reference the backup script rc.local on the
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