On 03/14/2011 01:02 PM, Mike Snitzer wrote:
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.
Thanks...
$ cat /etc/debian_version
wheezy/sid
$ /sbin/lvm version
LVM version: 2.02.84(2) (2011-02-09)
Library version: 1.02.63 (2011-02-09)
$ uname -r
2.6.37-2-amd64
--
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