Multipath and friendly names

[Shashank]

> The names in /dev/mpath are now
> the WWID

the mpath* names are indeed just that, user friendly names, not to be
used for creating LVMs. The /dev/dm-* (device mapper names) are the
ones that should be used instead.

Also in /etc/multipath.conf there is a section where you can specify
the WWID and provide an alias. This alias will show up on your
multipath -l command.


I think you have to start udev service, restart multipathd service and
possibly run partprobe for the userfrienly names to show up, although
I am not sure of the sequence of the commands.


So to recap,
1. add aliases for WWIDs in multipath.conf file
2. use dm-* while pvcreating (pvcreate /dev/dm-12, vgcreate vg_test /dev/dm-12)
3. make sure multipath -l  is showing user friendly names


hth,
-Shashank