Hello, I found at the final section of [0] , tips and tricks, item 1.1 the following
"Persistent device names: The names (uid_names or mpath names or alias names) that appear in /dev/mapper are persistent across boots, and the names dm-, dm-1 etc., can change between reboots. So, it is advisable to use the device names that appear under /dev/mapper and avoid using the dm-? names." So, I "guess" that the previously cited differences between friendly names was due to different machines booting. Is it a correct assumption? Thanks. Andre Felipe Machado [0] http://sources.redhat.com/lvm2/wiki/MultipathUsageGuide