From owner-freebsd-questions@FreeBSD.ORG Wed Nov 18 02:36:35 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 71656106566B for ; Wed, 18 Nov 2009 02:36:34 +0000 (UTC) (envelope-from tj@tjvarghese.com) Received: from mail-px0-f182.google.com (mail-px0-f182.google.com [209.85.216.182]) by mx1.freebsd.org (Postfix) with ESMTP id 54FB78FC1E for ; Wed, 18 Nov 2009 02:36:34 +0000 (UTC) Received: by pxi12 with SMTP id 12so447987pxi.3 for ; Tue, 17 Nov 2009 18:36:33 -0800 (PST) MIME-Version: 1.0 Received: by 10.142.4.11 with SMTP id 11mr1169315wfd.86.1258510432195; Tue, 17 Nov 2009 18:13:52 -0800 (PST) In-Reply-To: <64c038660911171249r141cc810n62a721e48225954c@mail.gmail.com> References: <64c038660911171249r141cc810n62a721e48225954c@mail.gmail.com> Date: Wed, 18 Nov 2009 10:13:52 +0800 Message-ID: From: TJ Varghese To: Modulok Content-Type: text/plain; charset=UTF-8 Cc: freebsd-questions@freebsd.org Subject: Re: Wester Digital 'deep recovery cycle' and gstripe? 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, 18 Nov 2009 02:36:35 -0000 On Wed, Nov 18, 2009 at 4:49 AM, Modulok wrote: > List, > > Has anyone used 'Wester Digital Caviar Black' disks in a gstripe? > > I'm building a 2TB gstripe, from 3x 1TB disks. My concern, is the > disks are 'consumer grade' disks. Western Digital mention not to use > them with a raid controller as they have a potential, 'deep recovery > cycle', which an last up to 2 minutes. This would theoretically result > in them being dropped from the array. Despite this, I've heard > successful uses of these disks via gmirror. (Granted, not the same as > gstripe). Again, in theory, if one disk enters a 'deep recovery cycle' > and is dropped from the array, and during that time another disks does > the same the array is toast, right? > > Umm...what are the odds of this occurring? War stories? (The more I > type this out, the more it's starting to sound like a bad idea.) > Thoughts, ideas? > -Modulok- google for WDTLER.EXE. I've had good results setting the recovery time to 7 seconds on the Caviar Greens & Blacks. FWIH, it only works up for WD drives up to 1TB. WD's Raid Ed. drives have the above setting on by default.