>From the data I can see all 6 multipath disks are set to failover mode.
Which in this special case is done because some implicit logic in the
multipath-tools detected that the scsi controller supports ALUA queries
and those returned that host0 has all disks in active state. So all IO
is going through that controller. The scsi disk devices seen through the
other controller (host1) are only in standby.

The boot dmesg reports inconsistencies in the ext4 filesystem on dm-6
which due to a (normally harmless) error message before can be
translated into mpath1-part2. Not sure, but on the system you gave me
access to the only alias with data was mpath0. So that may be a
potential problem or just a different config. And what cannot be seen is
whether maybe the installation+reboot had maybe left the filesystem in a
bad state.

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https://bugs.launchpad.net/bugs/1462530

Title:
  multipath errors on vivid and wily kernel?

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