[Bugs] [Bug 862347] Migration with "remove-brick start" fails if bricks are more than half full

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=862347



--- Comment #34 from Shawn Heisey <redhat at elyograg.org> ---
Thinking about this after I commented...

After we got our production volume up and running with 3.3.1, we ran into a
data-loss situation when doing a rebalance after adding bricks.

We found the likely bugzilla ID that represented the problem we encountered, so
I set up a new testbed to verify it.  I duplicated the problem we ran into by
pausing a brick process with OS signals, which caused a 42-second timeout and
data loss.  Then I verified that by upgrading the cluster to 3.4.2, the problem
went away.

The point that's relevant to this bug:  When I did that rebalance on 3.4.2, it
also exhibited the same disk usage expansion described by this bug.

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