Hello
Is there a possibility to get a list of changed files between two
snapshots? Currently I do this manually, using basic file system
functions offered by OS. I scan every byte in every file manually and
it is of course awfully slow.
If I have understood correctly, ZFS could use its own information
about which files use which blocks, and thereby calculate the
difference very quickly without having to scan every byte. Currently I
haven't found any tools like this. My application uses libZFS to
handle ZFS.
On the other hand, I have noticed that ZFS send generates difference
very quickly, even if it needs to find the small difference between
many unchanged files. From this, I have concluded that it may be using
the ZFS information to quickly see if file has been modified or not.
Do you have any idea how the send works? Maybe I could use its output
to get the list of changed files...
Henrik Heino
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