From owner-freebsd-stable@FreeBSD.ORG Tue Jan 26 19:17:53 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5917F1065704 for ; Tue, 26 Jan 2010 19:17:53 +0000 (UTC) (envelope-from bruce@cran.org.uk) Received: from muon.cran.org.uk (unknown [IPv6:2001:470:1f09:679::1]) by mx1.freebsd.org (Postfix) with ESMTP id 1E4BA8FC1F for ; Tue, 26 Jan 2010 19:17:53 +0000 (UTC) Received: from muon.cran.org.uk (localhost [127.0.0.1]) by muon.cran.org.uk (Postfix) with ESMTP id 601E8843A; Tue, 26 Jan 2010 19:18:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on muon.cran.org.uk X-Spam-Level: X-Spam-Status: No, score=0.1 required=8.0 tests=RDNS_DYNAMIC autolearn=no version=3.2.5 Received: from unknown (client-86-10-3-126.leed.adsl.virginmedia.com [86.10.3.126]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by muon.cran.org.uk (Postfix) with ESMTPSA; Tue, 26 Jan 2010 19:18:08 +0000 (UTC) Date: Tue, 26 Jan 2010 19:17:44 +0000 From: Bruce Cran To: Dan Naumov Message-ID: <20100126191744.00000305@unknown> In-Reply-To: References: X-Mailer: Claws Mail 3.7.2cvs27 (GTK+ 2.16.0; i586-pc-mingw32msvc) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: FreeBSD-STABLE Mailing List Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Jan 2010 19:17:53 -0000 On Tue, 26 Jan 2010 20:45:10 +0200 Dan Naumov wrote: > The disks are of exact same model and look to be same firmware. Should > I be worried that the newer disk has, in 136 hours reached a higher > Load Cycle count twice as big as on the disk thats 5253 hours old? There's a similar problem with laptop HDDs and APM settings that cause a high load_cycle_count too. According to https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695 and many blog entries, parking the heads frequently can shorten the HDD lifetime. -- Bruce Cran