From mboxrd@z Thu Jan 1 00:00:00 1970 From: jahammonds prost Subject: Array Power Management Date: Sun, 6 Sep 2009 20:48:03 -0700 (PDT) Message-ID: <292245.77763.qm@web55804.mail.re3.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I've been becoming interested in the power consumption of the arrays I = have on a couple of servers here that are basically used as media serve= rs. Since they're not being used when I'm at work, I was looking at the= possibility of spinning the disks down during certain times, and havin= g them either spin up at a set time, or (ideally), when there is disk a= ctivity. I can do this on single drives using hdparm -S to set the spindown time= out, and the disks will spin up on activity as needed. Is there somethi= ng similar I can do with an md array? I can see there's a /sys/block/md= 0/power/wakeup file, but I can't seem to find any documentation on it. = I have thought about doing an hdparm -S on the array disks, but I suspe= ct that would be A Bad Thing (tm). Does anyone have any advice/pointers? The servers are currently running= fc9 - I'd like them to be Centos, but had to go with fc9, as I=A0neede= d Port Multiplier support. Graham =20 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html