Hi,

I managed to mess up the cache pool on an erasure coded cephfs:

 - I split pgs on the cache pool, and got a stray/unknown pg somehow
 - added a second cache pool in the hopes that I'll be allowed to remove
the first, broken one
 - and now have two broken/misconfigured cache pools and no working cephfs,
neither of which I'm allowed to remove

I do not currently have the resources to set up a test cluster to try this
out first, and more than one cephfs seems to be an experimental feature.
But the data isn't crazy important, so:

Can I delete a cephfs and recreate it with the contents intact just by
using the same data/metadata pools as before?

My gut says, I'll be ok, but are there any gotchas?

I could also resolve this by removing the cache/overlay tiers on that pool
and add a newly created one, but this seems to be impossible/prohibited.

I'd be very grateful for any pointers!

cheers,
Philip
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