  [dm-devel] [PATCH 0 of 13] LVM add 'mirrored' log type  I've
fixed the segfaults Taka reported.  I've also begun to go
through and fix the remaining issues with handling device
failures in the various different scenarios.  I could use some
help testing all the different variations.  I've described below
some of the different permutations that will now exist.  I will
be going through and testing these as well.  Device failure
handling policies: The following policies are available for both
mirror logs and mirror "remove" (rm): Take out the failed device
from the LV and do nothing else.  IOW, just make things
consistent again.  "replace" (rp): Remove the failed device and
attempt to replace it with available space in the VG.  IOW, try
to recreate what was lost.  Device failure scenarios: You will
have to use '--alloc anywhere' to get the mirrored log to be
placed on the same devices as the mirror images.  Failing a
single device will result in a failure of an image in the
mirrored log and the mirror itself -