From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx13.extmail.prod.ext.phx2.redhat.com [10.5.110.18]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p2MGplOd011498 for ; Tue, 22 Mar 2011 12:51:47 -0400 Received: from mailmx.futuresource.com (mailmx.futuresource.com [208.10.26.74]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p2MGpdCD001922 for ; Tue, 22 Mar 2011 12:51:39 -0400 Received: from ns4.futuresource.com ([208.10.26.50]) by mailmx.futuresource.com (8.13.8/8.13.8) with ESMTP id p2MGoeQ6032750 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 22 Mar 2011 11:50:40 -0500 Received: from [172.22.181.98] ([172.22.181.98]) by ns4.futuresource.com (8.13.8/8.13.8) with ESMTP id p2MGpaBv018109 for ; Tue, 22 Mar 2011 11:51:37 -0500 Message-ID: <4D88D398.9060003@gmail.com> Date: Tue, 22 Mar 2011 11:51:36 -0500 From: Les Mikesell MIME-Version: 1.0 References: <4D7E4689.9060300@cox.net> <20110314171726.GA18249@redhat.com> <4D812183.6000901@cfl.rr.com> <20110316225539.GA3662@redhat.com> <4D8151EF.5020301@cfl.rr.com> <4D829D86.3050001@cox.net> <20110322102322.GK21093@nb.net.home> In-Reply-To: <20110322102322.GK21093@nb.net.home> Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] Advanced Format disks mixed with regular disks? Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-lvm@redhat.com On 3/22/2011 5:23 AM, Karel Zak wrote: > > It seems (according to feedback from users) that newer WDxxEARS disks > are already fixed. > http://community.wdc.com/t5/Desktop/Problem-with-WD-Advanced-Format-drive-in-LINUX-WD15EARS/m-p/20675#M1245 > > > Try > > hdparm -I /dev/ > > to see more details, for example: > > Logical Sector size: 512 bytes > Physical Sector size: 4096 bytes > > and > > # cat /sys/block//queue/physical_block_size > 4096 This isn't exactly an LVM issue (but I suppose it could be, and at least some people understand the problem here...). I'd like to do RAID1 with a WD 'Scorpio' laptop-size 750 gig drive which has 4k sectors but reports 512 as both the physical and logical size as one member with a full size Seagate with a matching number of sectors as the other. And I'd like to periodically swap the small drive, rotate offsite, and resync a different one. As things stand, it would take days for this sync to complete so I've been using full size drives for both instances. Is there some hope of getting the sync time down to 8 hours or so? And is that going to involve both updating to a fairly recent Linux distro (it's Centos 5.x now) and starting from scratch with new partition alignment? For full disclosure, this is a backuppc archive with a bizallion hardlinks that would take many days to copy with a file-oriented approach and it's really a 3-member raid1 where 2 drives are always present and one swapped in long enough to resync. But those things shouldn't matter except for the difficulty in changing the partition alignment. The existing one runs to the end of the disk so I can't offset the start and still match up in size. -- Les Mikesell lesmikesell@gmail.com