From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx11.extmail.prod.ext.phx2.redhat.com [10.5.110.16]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p2EJEBJv004980 for ; Mon, 14 Mar 2011 15:14:11 -0400 Received: from eastrmfepo201.cox.net (eastrmfepo201.cox.net [68.230.241.216]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p2EJE2qH020070 for ; Mon, 14 Mar 2011 15:14:02 -0400 Received: from eastrmimpo02.cox.net ([68.1.16.120]) by eastrmfepo201.cox.net (InterMail vM.8.01.04.00 201-2260-137-20101110) with ESMTP id <20110314191401.RVSC32549.eastrmfepo201.cox.net@eastrmimpo02.cox.net> for ; Mon, 14 Mar 2011 15:14:01 -0400 Message-ID: <4D7E68F6.5040700@cox.net> Date: Mon, 14 Mar 2011 14:13:58 -0500 From: Ron Johnson MIME-Version: 1.0 References: <4D7E4689.9060300@cox.net> <20110314171726.GA18249@redhat.com> In-Reply-To: <20110314171726.GA18249@redhat.com> 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 03/14/2011 12:17 PM, Mike Snitzer wrote: > On Mon, Mar 14 2011 at 12:47pm -0400, > Ron Johnson wrote: > >> Hi, >> >> Is there any concern with mixing 4KB-sector drives with 512-byte >> sector drives in the same LV? > > Both LVM2 and Device Mapper have been updated to accommodate stacking > such a mix of drives. > > See this for a bit more detail: > http://people.redhat.com/msnitzer/docs/io-limits.txt > > Particularly, the "Stacking I/O Limits" section. > > The concern raised for partial (4k) writes to the 512b drive was > discussed a bit more here: http://lkml.org/lkml/2010/2/22/295 > Does this mean that util-linux v2.17.1 fdisk correctly handle AF disks? (Note that I will *not* be booting off an AF device.) ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.17/v2.17.1-ReleaseNotes fdisk: - cleanup alignment, default to 1MiB offset [Karel Zak] - don't check alignment_offset against geometry [Karel Zak] - fallback for topology values [Karel Zak] - fix ALIGN_UP [Karel Zak] - fix check_alignment() [Karel Zak] - fix default first sector [Karel Zak] - use "optimal I/O size" in warnings [Karel Zak] - use 1MiB offset and grain always when possible [Karel Zak] - use more elegant way to count and check alignment [Karel Zak] - use optimal_io_size [Karel Zak] -- I prefer banana-flavored energy bars made from tofu.