From owner-freebsd-questions@FreeBSD.ORG Wed May 12 14:56:55 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 95A341065673 for ; Wed, 12 May 2010 14:56:55 +0000 (UTC) (envelope-from mike@sentex.net) Received: from lava.sentex.ca (pyroxene.sentex.ca [199.212.134.18]) by mx1.freebsd.org (Postfix) with ESMTP id 5AC578FC21 for ; Wed, 12 May 2010 14:56:54 +0000 (UTC) Received: from mdt-xp.sentex.net (simeon.sentex.ca [192.168.43.27]) by lava.sentex.ca (8.14.3/8.14.3) with ESMTP id o4CEurEZ078671; Wed, 12 May 2010 10:56:53 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <201005121456.o4CEurEZ078671@lava.sentex.ca> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Wed, 12 May 2010 10:56:49 -0400 To: "A. Wright" , freebsd-questions@freebsd.org From: Mike Tancsa In-Reply-To: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Cc: Subject: Re: Long I/O pauses on same mass storage X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2010 14:56:55 -0000 At 09:46 AM 5/12/2010, A. Wright wrote: >While I will run some further tests here, I thought I would >ask: > > Is anyone else seeing poor disk I/O scheduling or locking > behaviour in 8.0? Hi, On my backup server I am seeing somewhat better throughput/performance, at least with ZFS, but I have not done any rigorous comparisons. Certainly nothing perceptible from userland > Is anyone aware of any of the filesytem changes that > have occurred since 7.2 that may explain this? There are a lot, but then again the act of installing / upgrading could just mean you are now hitting bad sectors on the drive ? > Does anyone have any thoughts on how to conclusively > prove that the drive is at fault? I have not seen any > errors logged to dmesg. Start with smartmontools to ask your disk if it has logged any errors and check once a day or so to see if sectors are being remapped. ---Mike >Thanks, >Andrew. > >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -------------------------------------------------------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet since 1994 www.sentex.net Cambridge, Ontario Canada www.sentex.net/mike