Impossible to mount two different copies of the same btrfs

[carlo von lynX <lynX@time.to.get.psyced.org>]

Hi there. Excuse me if I didn't subscribe the list. Just wanted to
let you know of this behavior assuming you haven't noticed it yet.

When mounting two copies of the same file system from two different
hard disks with the intention of syncing the older with the newer
one, btrfs behaves differently from ext4: it will mount the first
one twice rather than mounting each. I assume it has something to
do with all UUIDs being identical, which doesn't disturb ext4 though.

This only happens with btrfs - I cannot mount two file systems that
happen to have the same UUID (or are deemed identical by some other
criterion I cannot determine). I presume this is not intended
behavior. I tried relabeling one of the copies, but it didn't have
any effect. Now I'm looking into ways to change the UUID.

Thanks for the great snapshots however!


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