From mboxrd@z Thu Jan 1 00:00:00 1970 From: "P. Gautschi" Subject: Re: Disks never stop spinning Date: Sat, 06 Dec 2014 16:16:23 +0100 Message-ID: <54831DC7.4070304@gautschi.net> References: <54610788.6060103@gautschi.net> <21604.47814.651762.246947@tree.ty.sabi.co.uk> <54657187.6020306@gautschi.net> <5480B726.8070103@ubuntu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <5480B726.8070103@ubuntu.com> Sender: linux-raid-owner@vger.kernel.org To: Phillip Susi Cc: Peter Grandi , Linux RAID List-Id: linux-raid.ids > Are you running udisks? If so then that is the culprit. It polls the > drive's SMART stats every 10 minutes unless the drive is already > asleep, so if the timeout is>= 10 minutes ( which it seems WD drives > refuse to go any lower anyhow ), then the drive will never go to > standby. I posted some patches to fix this a while back on the > devkit-devel mailing list but I think the udisks maintainer has still > not gotten around to applying them. This is indeed the cause in my case. There are the two problems that overlap: if a shorter time then 10 minutes is set as a standby time, the WD disk rounds this up to 10 minutes. And Kubuntu is using udisksd. It is started during a KDE login and never stopped when logging out. Is it possible to configure udisks to not do any polling or at a much longer interval? Or is it possible to safely disable udisksd somehow? I'm still looking for a practical solution. regards Patrick