Re: [dm-devel] [PATCH] dm snapshot: add allocated metadata to snapshot status

[Alasdair G Kergon <agk redhat com>]

I'm thinking a formula more like:
  ((current_area - 2) / (exceptions_per_area + 1) + 3
for the number of metadata chunks.
(Untested.)

Try it - then write to the origin one chunk at a time and check the output.
(Add 'current_area' to the status line while you are testing it.)

Alasdair