[linux-lvm] Advanced Format disks mixed with regular disks?
Mike Snitzer
snitzer at redhat.com
Mon Mar 14 20:00:57 UTC 2011
On Mon, Mar 14 2011 at 3:13pm -0400,
Ron Johnson <ron.l.johnson at cox.net> wrote:
> On 03/14/2011 12:17 PM, Mike Snitzer wrote:
> >On Mon, Mar 14 2011 at 12:47pm -0400,
> >Ron Johnson<ron.l.johnson at cox.net> 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]
Given that changelog, yes.
(cc'ing kzak for the authoritative answer ;)
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