This documentation:
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Cluster_Logical_Volume_Manager/LV_create.html
explains that you can keep the log in memory only, which requires a re-scan of
the mirror on bootup.
However, it still doesn't work:
% sudo lvcreate -L 1G --corelog -m1 -n testmirror Ubuntu
LV testmirror_mlog: segment 1 has inconsistent PV area 0
Internal error: LV segments corrupted in testmirror_mlog.
Failed to create mirror log.
..which is anyway reported in #121024, which is tagged as duplicate of
#121527, which I'll tag as duplicate of this.
--
lvcreate fails with mirror raid1
https://bugs.launchpad.net/bugs/120792
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