RAID + Hard drive sleep

[Kenneth Loafman]

There is a product called 'spindown', https://code.google.com/p/spindown/,
which I've been using for my external drives and it works like a charm.

I don't think you could use it on a raid array of any kind because the array
would detect the change in state of the drive, poll the drive to make sure
it's still OK, and bring it right back up.  The spin down would have to be
part of the raid software / firmware.

...Ken

On Mon, Jan 31, 2011 at 11:20 AM, Lucio M Nicolosi <lmnicolosi at gmail.com>wrote:

> On Mon, Jan 31, 2011 at 1:00 PM, Steve Malenfant <smalenfant at gmail.com>
> wrote:
> > I know I shouldn't probably do this and maybe it can't be done. But since
> I
> > don't use my server that often I'd like my drive to sleep a little bit. I
> > got the 1.5TB array up and running (From another thread) and both drives
> are
> > using about 10W more than the laptop drive I had in there. Now this isn't
> > much but I'm trying to save a little and see if those drive could
> > sleep/standby.
> > I believe I've seen this somewhere. But there might be too many logs
> written
> > or other stuff going on (cron jobs, etc..). But I can disable some maybe.
> > Is there any danger of setting the spindown on the hard drive on a MD
> array?
> > If I force the drive to go to sleep (hdparm), then it spins back up right
> > away. Is this caused by the array writing something to disk all the time?
> > Any help would be appreciated.
> > Thanks.
>
> Regarding a desktop or server, I wonder if the spinning up and down of
> a sleep configured HD wouldn't do more harm than letting it on all the
> time.
>
> --
> L M Nicolosi, Eng.
> GNU-Linux Regist. User #481505 - http://counter.li.org/
> Ubuntu 10.10 AMD64
>
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