Multipath and friendly names

[Allen, Jack]

Hello:
	I did not get any response from this, so I will follow up what I
found in case someone does a search on the later.

	After doing some searching on redhat.com I found something that
helped. The user_friendly_name only controls what gets put in
/dev/mapper. The RedHat information stated that /dev/mpath/mpath* should
not be used for LVM because it may not be there during the early part of
booting. The /dev/mapper/mpath* name will be.

Thanks:
Jack Allen 

-----Original Message-----
From: Allen, Jack 
Sent: Friday, June 20, 2008 10:50 AM
To: redhat-list at redhat.com
Subject: Multipath and friendly names

Hello: 
        Earlier this week I posted the problem I was having with
PowerPath and RHEL 5.2. So I decided to use device-mapper-multipath. For
the most part things work fine, but I have run into a little problem.

        The SAN is an EMC Clariion. When I set things up, commented out
the blacklist in multipath.conf and added user_friendly_name yes in the
default section, enabled multipathd and started it, it saw the SAN LUNS
and created /dev/mpath/mpath0 - /dev/mpath/mpath3.

        I did pvcreate and vgcreate using the /dev/mpath/mpath? names.
Created Logical Volumes, all with no problems. Then later I rebooted the
system just to make sure everything would show up as it should,
basically it did, except for one thing. The names in /dev/mpath are now
the WWID. The LVM finds the Volume Group and activates it, but when you
do certain commands the WWID are shown instead of /dev/mpath/mpath0 -
/dev/mpath/mpath3.

        Because there is support built-in for EMC, I did not have to
create a devices section for EMC in multipath.conf.

        So my question is, because of this, is the default section
ignored? 

        If does this mean I have to define a devices section for EMC
with the use_friendly_name option in it? 

Note:   I have not added anything in modprobe.conf, but there are
several dm_* modules that get loaded. 

Thanks: 
Jack Allen 

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