On Mon, Apr 16, 2007 at 05:13:37PM -0500, [EMAIL PROTECTED] wrote:
>
> Why it was considered a valid data column in its current state is
> anyone's guess.
>
This column is precise and valid. It represents the amount of space
uniquely referenced by the snapshot, and therefore the amount of space
that would be freed were it to be deleted.
The shared space between snapshots, besides being difficult to
calculate, is nearly impossible to enumerate in anything beyond the most
trivial setups. For example, with just snapshots 'a b c d e', you can
have space shared by the following combinations:
a b
a b c
a b c d
a b c d e
b c
b c d
b c d e
c d
c d e
d e
Not to mention the space shared with the active filesystem. With dozens
of snapshots, you're talking about hundreds or thousands of
combinations. It's certainly possible to calculate the space used
various snapshot intersections, but presenting it is another matter.
Perhaps you could describe how you would like this information to be
presented in zfs(1M).
- Eric
--
Eric Schrock, Solaris Kernel Development http://blogs.sun.com/eschrock
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