Multipath and friendly names

[Chet Nichols III]

Hey Jack-
That was all new to me, so thanks for figuring it out and following up with
the solution :)

Take care-
Chet

On Wed, Jun 25, 2008 at 5:51 PM, Allen, Jack <Jack.Allen at mckesson.com>
wrote:

> 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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-- 
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chet nichols III
chet.nichols at gmail.com
aim: chet / twitter: chet
http://chetnichols.org
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