On Sep 21, 2009, at 2:43 PM, Andrew Deason wrote:
On Mon, 21 Sep 2009 17:13:26 -0400
Richard Elling <richard.ell...@gmail.com> wrote:
OK, so the problem you are trying to solve is "how much stuff can I
place in the remaining free space?" I don't think this is knowable
for a dynamic file system like ZFS where metadata is dynamically
allocated.
Yes. And I acknowledge that we can't know that precisely; I'm trying
for
an estimate on the bound.
You don't know the max overhead for the file before it is allocated.
You could guess at a max of 3x size + at least three blocks. Since
you can't control this, it seems like the worst case is when
copies=3.
Is that max with copies=3? Assume copies=1; what is it then?
1x size + 1 block.
-- richard
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