lvextend -m 1 PVG

[JOHN TURNER_2]

is it possible to lvextend -m 1 to create a mirror and specify the PVG name such as VGP_CCA_D2M instead of specifying the disks or the volume group so that i can mirror straight into the mirror disks that have been set up in the /etc/lvmpvg file

[Stefan Farrelly]

Yes indeed.

[Duncan Edmonstone]

Yes you can, but if you set up the logical volume with PVG-strict allocation policy then you don't even need to specify a PVG at all. If PVG-strict is the allocation policy on the logical volume then mirrored extents will automatically go into a different physical volume group from their corresponding original extent.

See the man page for lvextend/lvchange/lvcreate for more info.

HTH

Duncan

[Marco Santerre]

Yes you are allowed to do that

[LucianoCarvalho]

Yes! You can do that.

[S.K. Chan · Accepted solution]

Yes you can, if you look at the man pages for lvextend you can specify the PV name or PVG name at the end. But let me ask you this ..
the LV that you're trying to extend (eg: /dev/vg01/lvol1) when it was first created and mirrored did you set the strict allocation policy to PVG-strict ? Example ..
# lvcreate -L 1200 -m 1 -s g -n lvol1 /dev/vg01
==> Creating a 1.2GB LV (lvol1) and set strict alloaction policy to PVG-strict (-s g).
If the answer is yes then all you need to do is (when you need to extend it) is to run the regular lvextend command.
# lvextend -L 2400 /dev/vg01/lvol1
as the mirroring policy has been setup during the creation.