Re: Power saving/spinning down RAID drives

From: Jean-David Beyer (jdbeyer_at_exit109.com)
Date: 10/18/04 

Date: Mon, 18 Oct 2004 12:58:25 -0400

Jules wrote:
> 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
processor cycles. 

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