[linux-lvm] Advanced Format disks mixed with regular disks?

[John Drescher]

On Mon, Mar 14, 2011 at 3:13 PM, 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]
>
> --
> I prefer banana-flavored energy bars made from tofu.

fdisk now aligns partitions to sector 2048. I know this since it has
done that on the last few I formatted.

John