From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Mon, 31 Mar 2008 11:27:45 -0700 (PDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.168.29]) by oss.sgi.com (8.12.11.20060308/8.12.11/SuSE Linux 0.7) with ESMTP id m2VIRaas013559 for ; Mon, 31 Mar 2008 11:27:37 -0700 Received: from smtp.getmail.no (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 4AD4F7194F7 for ; Mon, 31 Mar 2008 11:28:11 -0700 (PDT) Received: from smtp.getmail.no (smtp.getmail.no [84.208.20.33]) by cuda.sgi.com with ESMTP id Luodrqi28T5JfgoM for ; Mon, 31 Mar 2008 11:28:11 -0700 (PDT) Received: from pmxchannel-daemon.no-osl-m323-srv-004-z2.isp.get.no by no-osl-m323-srv-004-z2.isp.get.no (Sun Java System Messaging Server 6.2-7.05 (built Sep 5 2006)) id <0JYL0065BXYXGO00@no-osl-m323-srv-004-z2.isp.get.no> for xfs@oss.sgi.com; Mon, 31 Mar 2008 20:28:09 +0200 (CEST) Received: from smtp.getmail.no ([10.5.16.1]) by no-osl-m323-srv-004-z2.isp.get.no (Sun Java System Messaging Server 6.2-7.05 (built Sep 5 2006)) with ESMTP id <0JYL001HTXVD1720@no-osl-m323-srv-004-z2.isp.get.no> for xfs@oss.sgi.com; Mon, 31 Mar 2008 20:26:01 +0200 (CEST) Received: from localhost ([84.215.109.218]) by no-osl-m323-srv-009-z1.isp.get.no (Sun Java System Messaging Server 6.2-7.05 (built Sep 5 2006)) with ESMTP id <0JYL001WEXVDWPD0@no-osl-m323-srv-009-z1.isp.get.no> for xfs@oss.sgi.com; Mon, 31 Mar 2008 20:26:01 +0200 (CEST) Received: from thor by localhost with local (Exim 4.69 #1 (Debian)) id 1JgOhk-0005ZI-Vt for ; Mon, 31 Mar 2008 20:26:01 +0200 Date: Mon, 31 Mar 2008 20:26:00 +0200 From: Thor Kristoffersen Subject: Does XFS prevent disk spindown? Message-id: MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: xfs@oss.sgi.com I've noticed that when I spin down XFS-mounted disks they spin up again shortly afterwards. I used iostat to monitor disk accesses to a mounted partition (with noatime) in single user mode. Apparently there is a write access to the partition approximately every 35 seconds, even if the partition is idle. As far as I can understand, since there is no data that needs to be flushed this must be done by an XFS daemon for some purpose. Is there any setting or mount option I can use to get rid of this behavior? I know I can freeze the filesystem, but then I have to remember to unfreeze it every time I need to write to it, so it's not an ideal solution. Thor