Dne 07. 09. 20 v 18:34 Tomas Dalebjörk napsal(a):
thanks for feedback
so if I understand this correctly
# fallocate -l 100M /tmp/pv1
# fallocate -l 100M /tmp/pv2
# fallocate -l 100M /tmp/pv3
# losetup —find —show /tmp/pv1
# losetup —find —show /tmp/pv2
# losetup —find —show /tmp/pv3
# vgcreate vg0 /dev/loop0
# lvcreate -n lv0 -l 1 vg0
# vgextend vg0 /dev/loop1
# lvcreate -s -l 1 -n lvsnap /dev/loop1
# vgchange -a n vg0
# lvconvert —splitsnapshot vg0/lvsnap
# vgreduce vg0 /dev/loop1
Hi
Here you would need to use 'vgsplit' rather - otherwise you
loose the mapping for whatever was living on /dev/loop1
# vgcreate vg1 /dev/loop2
# lvcreate -n lv0 -l 1 vg1
# vgextend vg1 /dev/loop1
And 'vgmerge'
# lvconvert -s vg1/lvsnap vg1/lv0
not sure if the steps are correct?
I hope you realize the content of vg1/lv0 must be exactly same
as vg0/lv0.
As snapshot COW volume contains only 'diff chunks' - so if you
would attach snapshot to 'different' lv - you would get only mess.
Zdenek
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