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At the moment pmspare is created as a linear volume. There is no way how to make it redundant.
lvcreate and lvrename fails with:
Names including "_pmspare" are reserved. Please choose a different LV name.
Comment 2RHEL Program Management
2014-04-01 05:47:57 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
I assume we may eventally support 'lvconvert -m+X' for _pmspare.
On the other hand _pmspare is 'last resource' weapon not even normally used - it's reserved space for recovery operation when everything else fails thus it should not really matter which type is that.
What user should be always able to make is to 'pvmove & lvconvert' real _tmeta & _cmeta volumes.
_pmspare does not normally hold any data so it's rather lost space to use raid for such volume - lvm2 never automatically 'deletes' old metadata volume,
so there should be always original version on raid.
At the moment pmspare is created as a linear volume. There is no way how to make it redundant. lvcreate and lvrename fails with: Names including "_pmspare" are reserved. Please choose a different LV name.