Back up plan for san migration. lvmconvert--2 leg scenario.

PoleStar · 03-05-2015, 02:39 PM

Hello,

So I am going to move lvm from one san to anohter.
Its on CentOS 5.

so "lvm1" from "sanA" to "sanB"
I do

Code:

>lvconvert -m1 --corelog VG/lvm1   /dev/disk_on_sanB
check:
>lvmdisplay  -m
...
..
Logical volume lvm1_mimage_0
......
Logical volume lvm1_mimage_1

then I break the mirror, taking off lvm1 from old sanA
>lvconvert -m0 VG/lvm1  /dev/disk_on_sanA

At this point if some thing goes wrong, is there a way to bring back original lvm1(from sanA) back to the server ?

Thanks

PoleStar · 03-06-2015, 09:19 AM

I found the solution.

after you remove one leg( it was writing on 2 sans simultaneously) from old sanA

>lvconvert -m0 VG/lvm1 /dev/disk_on_sanA

do

Quote:

>vgsplit VG backVG /dev/disk_on_sanA
make it to lvm
>lvcreate -l992G -n backlvm1 backVG

At this point you can mount /dev/backVG/backlvm1 (from old san)