Re: LVM Mirroring

[Tom H <tomh0665@gmail.com>]

On Fri, Jan 11, 2013 at 3:21 PM, Bob Proulx <bob@proulx.com> wrote:
> Luca Saletta wrote:
>>
>> menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-686' --class debian
>> --class gnu-linux --class gnu --class os {
>>         insmod lvm
>>         insmod part_msdos
>>         insmod ext2
>>         set root='(rootVG-rootLV)'
>>         search --no-floppy --fs-uuid --set 809a5d50-9789-4e56-952d-868cb243cd0c
>>         echo    'Loading Linux 2.6.32-5-686 ...'
>>         linux   /boot/vmlinuz-2.6.32-5-686 root=/dev/mapper/rootVG-rootLV ro  quiet
>>         echo    'Loading initial ramdisk ...'
>>         initrd  /boot/initrd.img-2.6.32-5-686
>> }
>
> I have not myself used LVM mirroring.  I have only used mdadm MD
> mirroring. This means I am fuzzy on your exact configuration.  But
> the above tells me that you have the root volume directly on lvm using
> the rootVG-rootLV volume.  Which is fine.

[AIUI (I've never used this) LVM mirroring is like mdraid level1 but
instead of mirroring partitions, you're mirroring LVs.]

Could the problem be the reverse of the earlier LVM-over-MDRAID thread
whereby changing "root=/dev/mapper/rootVG-rootLV" to
"root=/dev/mapper/rootVG/rootLV" will allow the system to boot?!