On Mon, 08 Dec 2014 02:30:06 -0600, Anatoly Pugachev <matorola@gmail.com>
wrote:
On Mon, Dec 8, 2014 at 12:24 AM, Phillip Susi <psusi@ubuntu.com> wrote:
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On 12/05/2014 05:12 AM, Anatoly Pugachev wrote:
> Phillip,
>
> can you please paste the commands you've used to convert the
> volume? I don't have ubuntu , but rhel7 manual page for lvconvert,
> example section is pretty clear on how to convert back to flat
> (-m0) volume and what physical device you remove from logical
> volume, quote:
>
>
> Converts mirror logical volume "vg00/lvmirror1" to linear, freeing
> physical extents from /dev/sda:
>
> lvconvert -m0 vg00/lvmirror1 /dev/sda
I simply used lvconvert -m0 vg/lv. I did not think I would need to
specify which leg should be kept; obviously it should be the one
currently in use rather than the out of date copy.
I wonder how many more people would lost their data before there would
be changes to lvconvert -m0 to require specification of physicalVolume
instead of optional requirement.
I may have missed part of the discussion but in order to fully understand
what is going on I'd like to know what arguments you used when you issued
the "lvconvert --splitmirrors" command. There are several options to it
that can influence what happens to the mirror members.
The best way I know of to get that is from the /etc/lvm/archive/ files for
the volume group in question. Those contain the maps for the volume
group. A new map version is created in that directory after every command
that modifies the volume group. Each map contains a "description" line
that shows the command that was run making the changes. The map does not
include the changes as it is meant to be used as a reference to the
configuration before the change.
If you only want to send the commands as pulled from the archive maps here
is an example from the system I have been trying to re-create this failure
scenario on.
[2:root@hostname /root]# grep Created /etc/lvm/archive/test01VG_0000*
/etc/lvm/archive/test01VG_00000-1787228376.vg:description = "Created
*before* executing 'vgcreate test01VG /dev/sdar /dev/sdas /dev/sdat
/dev/sdau /dev/sdav /dev/sdaw /dev/sdax'"
/etc/lvm/archive/test01VG_00001-1025082804.vg:description = "Created
*before* executing 'lvcreate -L50G -m1 --type raid1 test01VG -n test01LV'"
/etc/lvm/archive/test01VG_00002-178937097.vg:description = "Created
*before* executing 'lvconvert --splitmirrors 1 --name test01LV-M1
test01VG/test01LV'"
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