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Mirrored log with 'mirror' segtype should never be used.  Instead, people should be using the 'raid1' segtype.

Downsides to using mirrored log mirrors are:
1) requires 4 devices for 2-way mirror - increasing fault exposure
2) cannot be used in a cluster (so no-one uses it there anyway)
3) if logs are on same devs as images, the log is removed anyway when a image dies unless it is 3-way or greater
4) there are known issues with the mirror segtype and snapshots - mirrored log makes this worse by creating a stack of mirror types

Let's at least create a line in the sand and say no more 'mirrored' logs will be created.  (We can obviously honor/activate current installations.)

As of https://bugzilla.redhat.com/show_bug.cgi?id=1643562, we deprecated mirrored mirror log in RHEL8.
In RHEL7, we display 'WARNING: Log type "mirrored" is DEPRECATED and will be removed in the future. Use RAID1 LV or disk log instead.'

Closing this one WONTFIX.  Please reopen if priority to backport is raised.