On 09/16/09 10:48, 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?
Not necessarily. The existence of an upgrade function doesn't
automatically mean that downgrade should be provided. What would a
downgrade function do with, say, properties that weren't even defined in
the earlier version?
Some kind of downgrade could theoretically be done (with appropriate
messages about capabilities and fields that are not understood by the
earlier version of the coded), but I don't think its value would be
worth the effort, at least not in comparison to other work that needs
to be done.
Lori
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