From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin K. Petersen" Subject: Re: thin provisioned LUN support & file system allocation policy Date: Fri, 07 Nov 2008 10:51:09 -0500 Message-ID: References: <20081107120534.GO21867@kernel.dk> <49143142.4010809@redhat.com> <20081107121934.GP21867@kernel.dk> <49145029.4040900@redhat.com> <20081107144311.GE9543@mit.edu> <4914568A.7090307@redhat.com> <49145E0C.4030705@hp.com> <49146031.70003@hp.com> <20081107154655.GH9543@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <20081107154655.GH9543@mit.edu> (Theodore Tso's message of "Fri\, 7 Nov 2008 10\:46\:55 -0500") Sender: linux-fsdevel-owner@vger.kernel.org To: Theodore Tso Cc: jim owens , David Woodhouse , Ric Wheeler , Jens Axboe , Chris Mason , Dave Chinner , James Bottomley , linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, Black_David@emc.com, "Martin K. Petersen" , Tom Coughlan , Matthew Wilcox List-Id: linux-scsi@vger.kernel.org >>>>> "Ted" == Theodore Tso writes: Ted> How much of a disk wear factor is there with modern disk drives? Ted> The heads aren't touching the disk, and we have plenty of sectors Ted> which are constantly getting rewritten with traditional Ted> filesystems, with no ill effects as far as I know. Modern disk firmware maintains a list of write hot spots and will regularly rewrite adjacent sectors to prevent bleed. -- Martin K. Petersen Oracle Linux Engineering