On 04/23/2016 08:41 PM, Tim Bishop wrote:
Does this help? http://www.tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html I've not tried it myself, but that's how I understand CoW filesystems work and it's as Graham described. Tim.
Ah. I can finally see what I've been mistaken about. What goes into the snapshot scratch area isn't the new most recent data, it's a record of the original data before an update is performed on the rw main area.
So I don't need to run lvconvert --merge, which I now see pushes the updated content back to the original state.
All I need do, when the backup is finished, is umount the scratch space and lvremove it.
I was wrong from the beginning, the thread has cleared my misconception. Something in the FAQ would definitely help anyone capable of confusing matters the way I have.
Thank you all. John.