>>>>> "bh" == Brandon High <bh...@freaks.com> writes:

    bh> I think I'm seeing an error in the output from zfs list with
    bh> regards to snapshot space utilization.

no bug.  You just need to think harder about it: the space used cannot
be neatly put into buckets next to each snapshot that add to the
total, just because of...math.  To help understand, suppose you
decide, just to fuck things up, that from now on every time you take a
snapshot you take two snapshots, with exactly zero filesystem writing
happening between the two.  What do you want 'zfs list' to say now?

What does happen if you do that, is it says all snapshots use zero space.

the space shown in zfs list is the amount you'd get back if you
deleted this one snapshot.  Yes, every time you delete a snapshot, all
the numbers reshuffle.  Yes, there is a whole cat's cradle of space
accounting information hidden in there that does not come out through
'zfs list'.

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