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I had to move data from one HDD to another. So in existing LVM I extended it with new HDD. Moved from one to another hdd. Was fine but after restart LVM disappeared. I can see only partition LVM (pvdisplay, lvdisplay, vgdisplay show empty). No lucky recovering it. So can i use pvcreate (i don't have a backup data or uuid) and somehow get logical volumes with data?
I tried with testdisk and others with no good lucky.
So UUID are :
Where /dev/myPVpart is the physical-volume of the volume-group. It could be /dev/sda2, sdb1, sdc, ..., ...
Then you could use less or strings (or similar) to grab the LVM2 metadata text from it and identify how the LVs were structured. If you are not able to bring the LV(s) up (activate) using the available LVM binaries, with the metadata you should be able to manually reassemble the LV(s) using device-mapper (dmsetup) directly to recover any data not yet overwritten as long as all the segments are available.
I have read this thread and saw that rayfordj had some interesting insight into lvm recovery.
I have a similar problem (http://ubuntuforums.org/showthread.php?t=2128504) and would like to know if anyone can tell me if and how I could use dmsetup in order to recover data?