Jeff Victor wrote:
Why? Is the 'data is encrypted' flag only stored in filesystem
metadata, or is that flag stored in each data block?
Like compression and which checksum algorithm it will be stored in
every dmu object.
If the latter is
true, it would be possible (though potentially time-consuming) to
determine which files are encrypted, and which are not.
Exactly, time consuming and expensive.
Buth the reason thing is how do you tell the admin "its done now the
filesystem is safe". With compression you don't generally care if some
old stuff didn't compress (and with the current implementation it has to
compress a certain amount or it gets written uncompressed anyway). With
encryption the human admin really needs to be told.
So far there really isn't any time consuming or offline action for ZFS
data sets that actually impacts your data so I'd rather not introduce
one now (I wouldn't really put scrub in this category).
--
Darren J Moffat
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