[linux-lvm] how to copy a snapshot, or restore snapshot without deleting it
zkabelac at redhat.com
Mon Jan 28 11:49:31 UTC 2019
Dne 21. 01. 19 v 11:32 Zdenek Kabelac napsal(a):
> Dne 18. 01. 19 v 1:53 Davis, Matthew napsal(a):
>> Hi Zdenek,
>> I assumed that LVM thin snapshots would work like git branches.
>> Since git also uses diffs on the backend, and git is popular with
>> developers, the same kind of behaviour seems reasonable to me.
> There is very good reason why the git is not really a good tool for storing
> binary data...
> Your use-case is 'very specific' sub-case of many different usability
> scenarios you can do with lvm2 - so while you might see some potential
> benefit if the lvm2 would work more closely to git logic,
> it would look terrible in many other situations.
Adding some more thoughts here - we can probably give user an option to
control this - particularly in this case - how about something like:
lvconvert --mergesnapshot --keeporigin y|n
so if user would specify 'y' - lvm2 would relink/preserve merged snapshot as
an origin for all other existing snapshots of the old origin - this would make
more obvious what is going to happen when you start creating and merging lots
of them into a single origin.
(yeah - maybe there could be better fitting option name - so it's more about
idea here for now)
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