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Old 5th November 2008
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Default Possible to idle / spin-down SCSI drives?

Hi all

I have a FreeBSD 7.0 box which takes nightly rsnapshots of other machines. The snapshots are stored on a dedicated SCSI RAID-1 array, independent of the OS which is on a low-power 2.5" IDE drive.

In these cost/energy conscious times, is it possible to spin-down the SCSIs? They're only required for about 15 minutes a day, and the rest of the time they're hot, noisy and chewing power (and money) pointlessly!

I know of, and have used, ataidle for IDE drives. Is there an equiv for SCSI?

Controller is a Dell PERC 320/DC (nee Adaptec 2200S), running two Seagate 10k Barracudas. I can switch to an LSI MegaRAID that I have lying about if that would make any difference. (I understand the LSI cards have more functional management tools in FreeBSD).

Any help would be greatly appreciated!

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Old 5th November 2008
bsddaemon bsddaemon is offline
Slack Daemon
Join Date: Oct 2008
Posts: 35

I use camcontrol to spin down HDD.

In order to use camcontrol, you need to know the device identifier. The easiest form is the one which is extracted from the device node, e.g:

- Device node: /dev/da1s1

=> Device identifier: da1s1.

Now run the following command:

#camcontrol stop da1s1
...then the God created man...
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Old 6th November 2008
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Ah ok, I'll give that a go, thanks.

I take it camcontrol is for manual control only? So I'd need to modify my backup scripts to manually start and stop the drives.


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Old 6th November 2008
J65nko J65nko is online now
Join Date: May 2008
Location: Budel - the Netherlands
Posts: 3,898

Don't forget to allow the drives to spin up to full speed. You can do that easily by using sleep(1).
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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