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Date: Mon, 14 Mar 2011 14:02:50 -0400
From: Mike Snitzer <snitzer@redhat.com>
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Subject: Re: [linux-lvm] Advanced Format disks mixed with regular disks?
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To: LVM general discussion and development <linux-lvm@redhat.com>

On Mon, Mar 14 2011 at  1:32pm -0400,
Les Mikesell <lesmikesell@gmail.com> wrote:

> On 3/14/2011 12:17 PM, Mike Snitzer wrote:
> >
> >>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
> 
> Are there any version-level hints about when/where these changes
> appear and come together in the real world (i.e. distributions like
> RHEL, debian, Ubuntu)?

For the kernel, the bulk of associated infrastructure (ata, scsi, block,
dm, md, etc) went in 2.6.31, 2.6.32 saw some improvements, and 2.6.33
and 2.6.34 saw a few bug fixes.

v2.6.32.11 saw a backport of the 2.6.33 and 2.6.34 bug fixes via commit
9b2ff97

RHEL6 has all this.  I cannot speak for debian and/or Ubuntu.

As for LVM2, you'd want >= 2.02.62.

Mike