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I assume the issue here is - 'dmeventd' protects against 'failure' of standard running mirror.
As soon as old mirror is 'upconverting' there is nothing yet to resolve blocked mirror in upconversion (aka mirror on mirror)
This is nontrivial to resolve, since there is not much devel being done with old mirrors....
Comment 3Jonathan Earl Brassow
2020-07-22 21:48:50 UTC
closing this bug - don't use 'mirror' segtype, use default 'raid' segtype instead