Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763310AbXHGMKp (ORCPT ); Tue, 7 Aug 2007 08:10:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756346AbXHGMKe (ORCPT ); Tue, 7 Aug 2007 08:10:34 -0400 Received: from usish.com ([210.5.144.202]:34414 "EHLO sr-smtp.usish.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1762313AbXHGMKb convert rfc822-to-8bit (ORCPT ); Tue, 7 Aug 2007 08:10:31 -0400 X-Greylist: delayed 8357 seconds by postgrey-1.27 at vger.kernel.org; Tue, 07 Aug 2007 08:10:29 EDT From: "sam song" To: "'Tejun Heo'" Cc: "'Michael Sedkowski'" , "'Rafael J. Wysocki'" , "'Henrique de Moraes Holschuh'" , , , References: <838f88840708051428p3d65ff42w627af4bc38f57de3@mail.gmail.com> <1186411815.4355.7.camel@nx6310> <20070806150159.GC31615@khazad-dum.debian.net> <200708061732.03425.rjw@sisk.pl> <46B75459.9020204@gmail.com> <1186424492.4355.1.camel@nx6310> <46B76BBC.9010107@gmail.com> <1186438698.4402.6.camel@nx6310> <46B817AB.30105@gmail.com> <1186478319.3705.3.camel@nx6310> <46B83C0B.8050902@gmail.com> Subject: =?utf-8?Q?=E7=AD=94=E5=A4=8D=3A_Disk_spin_down_issue_on_s?= =?utf-8?Q?hut_down=2Fsuspend_to_disk?= Date: Tue, 7 Aug 2007 17:51:52 +0800 Message-ID: <000601c7d8d8$959c9130$5f39a8c0@usish.com.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcfY1dxcw084fTglQWG01roIsiEjnAAAfNlw In-Reply-To: <46B83C0B.8050902@gmail.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-imss-version: 2.047 X-imss-result: Passed X-imss-scanInfo: M:P L:N SM:0 X-imss-tmaseResult: TT:0 TS:0.0000 TC:00 TRN:0 TV:3.6.1039(15346.003) X-imss-scores: Clean:99.90000 C:2 M:3 S:5 R:5 X-imss-settings: Baseline:1 C:2 M:3 S:4 R:1 (0.0000 0.0000) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1116 Lines: 26 Tejun Heo wrote: > Michael Sedkowski wrote: > > Dnia 07-08-2007, Wt o godzinie 15:56 +0900, Tejun Heo napisał(a): > >> 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age > >> Always - 388 [snip] > On power off, the r/w heads in a disk should be unloaded (parked). This > is usually achieved by either putting the disk into standby/sleep mode > during shutdown. However, all modern disks can automatically unload > their heads when the power is removed abruptly. This is called > emergency unload. Emergency unload does shorten the lifespan of the > disk but you don't have to worry too much about it. Disks are designed > to withstand certain number of emergency unloads. Out of interest, does Power-Off_Retract_Count attribute only record emergency unloads rather than normal power off by Linux shutdown command? Thanks in advance, Sam - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/