I ran into this same problem after setting up my cluster on EL7. As has
been pointed out, the hosted-engine installer modifies /etc/multipath.conf.
I appended:
blacklist {
devnode "*"
}
to the end of the modified multipath.conf, which is what was there
before the engine installer, and the errors stopped.
I think I was getting 253:3 trying to map which don't exist on my
systems. I have a similar setup, md raid1 and LVM+XFS for gluster.
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