From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Drives which perform frequent head unloads under Linux Date: Mon, 16 Feb 2009 12:52:39 +0900 Message-ID: <4998E307.2010903@kernel.org> References: <200902031429.19457.fcartegnie@free.fr> <499380D2.5070306@kernel.org> <200902121414.46309.fcartegnie@free.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from hera.kernel.org ([140.211.167.34]:49121 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755965AbZBPDw5 (ORCPT ); Sun, 15 Feb 2009 22:52:57 -0500 In-Reply-To: <200902121414.46309.fcartegnie@free.fr> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Francois Cartegnie Cc: IDE/ATA development list =46rancois Cartegnie wrote: > Le jeudi 12 f=C3=A9vrier 2009, vous avez =C3=A9crit : >> Francois Cartegnie wrote: >>> MSI Megabook S425 >>> MK8025GAS (unload every 8/10sec) >>> Workaround with APM to 254 (but doesn't disable totally). >> From the smartctl output, >> >> 9 Power_On_Hours ... 2791 >> 193 Load_Cycle_Count ... 100209 >> >> Which gives us 35.9 load cycles per hour which is kind of okay. Is >> this because you have been running the system with APM value adjuste= d? >=20 > The system has been fixed early, so It's not revealant. > The head clicks 3-4 seconds after the disk activity, which means that= if you=20 > are using ext3 with default commit time, you have a cycle every 5-6 s= econds. Alright, added and pushed out. Thanks. --=20 tejun