On 02/04/2014 03:52 PM, Kai Krakow wrote:
Hi!
I'm curious... The whole snapshot thing on btrfs is based on its COW design.
But you can make individual files and directory contents nocow by applying
the C attribute on it using chattr. This is usually recommended for database
files and VM images. So far, so good...
But what happens to such files when they are part of a snapshot? Do they
become duplicated during the snapshot? Do they become unshared (as a whole)
when written to? Or when the the parent snapshot becomes deleted? Or maybe
the nocow attribute is just ignored after a snapshot was taken?
After all they are nocow and thus would be handled in another way when
snapshotted.
When snapshotted nocow files fallback to normal cow behaviour. Thanks,
Josef
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