Re: Power saving/spinning down RAID drives
From: Jean-David Beyer (jdbeyer_at_exit109.com)
Date: Mon, 18 Oct 2004 12:58:25 -0400
> On Mon, 18 Oct 2004 23:34:15 -0400, Kamus of Kadizhar wrote:
>> I've got a bit of situation I hope someone can help me out with....
>> I have a server - an HP netserver - as my home server. It has 2 IDE
>> drives and 2 SCSI drives, in a softare RAID configuration. I am
>> planning to add 2 more SCSI drives, for a total of 4 SCSI drives.
>> The scsi drives will be a combination of RAID 1 and RAID5, with one
>> standby drive. The IDE drives are in a RAID1 mirror.
> Tip - don't spin down a drive with a mounted filesystem on it as I did.
> Oops :-)
> I believe the sg utils code *used* to come with a util for spinning
> down SCSI disks; I'm not sure if it's still the case. I used to do it
> to cut down noise on the home server until the aforementioned mishap
You might wish to bear in mind that spinning a hard drive up and down
probably wears it out faster than spinning it for a considerable time. It
is tough on the bearings for one thing. So you will need the actual
numbers on increased wear-and-tear from spinning them up and down and what
new hard drives cost compared with letting them run and paying a bit
more for the electricity. I leave mine on 24/7, and since they are up
anyway, I run setiathome, etc., at nice 19 to burn up the otherwise wasted
-- .~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 12:55:00 up 3 days, 26 min, 3 users, load average: 4.05, 4.10, 4.09