Marty Scholes wrote:
Lori Alt wrote:
As for being able to read streams of a later format
on an earlier
version of ZFS, I don't think that will ever be
supported. In that
case, we really would have to somehow convert the
format of the objects
stored within the send stream and we have no plans to
implement anything
like that.
If that is true, then it at least makes sense to include a "zfs downgrade" and
"zpool downgrade" option, does it not?
That is isn't very easy to implement and could take a HUGE amount of
time to convert the pool.
Consider a pool with data encrypted and compressed with gzip (that would
be a version 19 or higher pool) that you attempt to downgrade to version
4 ignoring all the other possible things you could be using that along
requires decrypting and decompression all the data. That is technically
possible but very time consuming.
For the zfs version it just isn't possible in some cases because, while
you could choose to nolonger care about userquota not caring about
create time only properties such as ut8only and normalization is a very
difficult issue.
--
Darren J Moffat
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