Robert Rodriguez <robertro <at> comcast.net> writes:
> 
> A couple of follow up question, have you done anything similar before?

I have done similar manipulations to experiment with ZFS
(using files instead of drives).

> Can you assess the risk involved here?

If any one of your 8 drives die during the procedure, you are going
to lose some data, plain and simple. I would especially be worried
about the 2 brand new drives that were just bought. You are probably
the best person to estimate the probability of them dying, as you
know their history (have been running 24/7 for 1-2 years with
periodical scrubs and not a single pb ? then they are probably ok).

IMHO you can reduce the risk a lot by scrubbing everything:
- before you start, scrub your existing pool (pool #1)
- scrub pool #2 after copying data to it and before destroying pool #1
- scrub pool #1 (made of sparse files) and pool #3 (backing the sparse
  files) after copying from pool #2 to #1
- rescrub pool #1 after replacing the sparse files with real drives

> Does the fact that the pool is currently at 90% usage change this
> in any way.

Nope.

-marc

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