[Novalug] LVM Snapshots

[American Dave Kline]

On Sat, Dec 18, 2010 at 10:34:50PM -0500, James Ewing Cottrell 3rd wrote:
>    Thanks for the answer, but you really didn't TELL me anything.
>    When you make a snapshot, the UUIDs are the same too. And it's a lot

This is not true:

$ sudo lvs -v vg_test
    Using logical volume(s) on command line
  LV          VG      #Seg Attr   LSize  Maj Min KMaj KMin Origin  Snap%
Move Copy%  Log Convert LV UUID                               
  lv_test     vg_test    1 owi-a- 12.00m  -1  -1 253  5
75WjEY-k9ED-lelP-DSqO-HM1Z-qGMJ-7TrFrI
  lv_testsnap vg_test    1 swi-a-  8.00m  -1  -1 253  6    lv_test
0.10                         p54Tfl-Lmku-qQqc-8q5U-fMgo-BP3B-mFpvUd

>    But my question still remains....Is It OK to run off a snapshot'ed
>    filesystem assuming I wanted to do that?

Yes, it's fine to run off a snapshot.  You can also merge a snapshot to
its origin with a current enough distro.  See the man page of lvconvert.

-A. Dave