From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Can't get drives containing spare devices to spindown Date: Tue, 30 May 2006 12:39:01 -0400 Message-ID: <447C7525.4010100@tmr.com> References: <446395C0.5060502@debruin.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <446395C0.5060502@debruin.org> Sender: linux-raid-owner@vger.kernel.org To: "Marc L. de Bruin" Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Did I miss an answer to this? As the weather gets hotter I'm doing all I can to reduce heat. Marc L. de Bruin wrote: > Lo, > > Situation: /dev/md0, type raid1, containing 2 active devices > (/dev/hda1 and /dev/hdc1) and 2 spare devices (/dev/hde1 and /dev/hdg1). > > Those two spare 'partitions' are the only partitions on those disks > and therefore I'd like to spin down those disks using hdparm for > obvious reasons (noise, heat). Specifically, 'hdparm -S > ' sets the standby (spindown) timeout for a drive; the value > is used by the drive to determine how long to wait (with no disk > activity) before turning off the spindle motor to save power. > > However, it turns out that md actually sort-of prevents those spare > disks to spindown. I can get them off for about 3 to 4 seconds, after > which they immediately spin up again. Removing the spare devices from > /dev/md0 (mdadm /dev/md0 --remove /dev/hd[eg]1) actually solves this, > but I have no intention actually removing those devices. > > How can I make sure that I'm actually able to spin down those two > spare drives? -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979