From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Stockinger Subject: Re: RAID 5 disks not spinning down Date: Sat, 12 Mar 2005 15:19:21 +0100 Message-ID: References: <4232F80E.1030202@wasp.net.au> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <4232F80E.1030202@wasp.net.au> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Brad Campbell wrote: > Alexander Stockinger wrote: > >> Hi all, >> >> I have a linux software RAID 5 running on a Debian Sarge with >> 2.6.7-smp. Since I installed the system (several kernel updates ago) >> the disks of the RAID 5 won't stay spinned down. Having them sent to >> standy manually using hdparm ends up in having the disks spin up >> within the next minute or so. >> To further investigate the problem I watched the /proc/diskstats file >> for /dev/md0 and realized that prior to the spinup a single read >> access to the RAID is issued - consequently the disks attached to the >> read spin up again... > > > Does it occur if you have the filesystem on the md device unmounted? No, drives stay down when the mount point of /dev/md0 is unmounted. So it's probably an application accessing something on the disks? But how do I determine what is accessed? dnotify reports _nothing_... > > Regards, > Brad Thanks, Alex