From owner-freebsd-stable@FreeBSD.ORG Tue Jul 15 19:55:42 2008 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 667A01065675 for ; Tue, 15 Jul 2008 19:55:42 +0000 (UTC) (envelope-from dillon@apollo.backplane.com) Received: from apollo.backplane.com (apollo.backplane.com [216.240.41.2]) by mx1.freebsd.org (Postfix) with ESMTP id 3E1F88FC18 for ; Tue, 15 Jul 2008 19:55:41 +0000 (UTC) (envelope-from dillon@apollo.backplane.com) Received: from apollo.backplane.com (localhost [127.0.0.1]) by apollo.backplane.com (8.14.1/8.14.1) with ESMTP id m6FJtfM0008970; Tue, 15 Jul 2008 12:55:41 -0700 (PDT) Received: (from dillon@localhost) by apollo.backplane.com (8.14.1/8.13.4/Submit) id m6FJtf77008969; Tue, 15 Jul 2008 12:55:41 -0700 (PDT) Date: Tue, 15 Jul 2008 12:55:41 -0700 (PDT) From: Matthew Dillon Message-Id: <200807151955.m6FJtf77008969@apollo.backplane.com> To: Steve Bertrand References: <487CCD46.8080506@ibctech.ca> <200807151711.m6FHBgVO007481@apollo.backplane.com> <487CF077.2040201@ibctech.ca> <487CFA08.5000308@ibctech.ca> Cc: freebsd-stable@freebsd.org Subject: Re: taskqueue timeout 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, 15 Jul 2008 19:55:42 -0000 :Went from 10->15, and it took quite a bit longer into the backup before :the problem cropped back up. Try 30 or longer. See if you can make the problem go away entirely. then fall back to 5 and see if the problem resumes at its earlier pace. -- It could be temperature related. The drives are being exercised a lot, they could very well be overheating. To find out add more airflow (a big house fan would do the trick). -- It could be that errors are accumulating on the drives, but it seems unlikely that four drives would exhibit the same problem. -- Also make sure the power supply can handle four drives. Most power supplies that come with consumer boxes can't under full load if you also have a mid or high-end graphics card installed. Power supplies that come with OEM slap-together enclosures are not usually much better. Specifically, look at the +5V and +12V amperage maximums on the power supply, then check the disk labels to see what they draw, then multiply by 2. e.g. if your power supply can do 30A@12V and you have four drives each taking 2A@12V (and typically ~half that at 5V), thats 4x2x2 = 16A@12V and you would probably be ok. To test, remove two of the four drives, reformat the ZFS to use just 2, and see if the problem reoccurs with just two drives. -Matt