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 _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/