> Does/should a balance imply removal of missing devices (as long as
the minimum number of devices are still available)?
That's a really good question. As a user I would expect it to balance
over remaining devices assuming you still have a complete picture.
Doing a device delete missing after a balance should be just some pool
metadata updates at that point.
Anyway... I solved my problem by moving/deleting files to free up space
to the point that balance no longer complained about enospc.
I suppose btrfs needs extra working space to do a balance... above and
beyond the actual size of the existing data/metadata to be moved? I had
a total of three devices, with what appeared to be plenty of space on
the two that were to be remaining, but balance/remove was still
complaining to be out of disk space.
It would be a good idea for some metrics to be calculated upon start of
a removal or balance to tell the user "hey you need to free up XXX more
bytes in order for this operation to be successful".
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