multipath alias not being created.

[ccb-HInyCGIudOg at public.gmane.org (Charles Bennett)]

On Tue, 2010-06-29 at 17:22 +0000, tmclaugh-VThn6mlTRQFChFL4AGkBsw at public.gmane.org wrote:
> (Apologies if this email gets double posted.  Wasn't sure if my other
> address was subscribed to this too.)
> 
> Hey, I'm setting up a CentOS 5.5 box right now which uses a LUN from
> our SAN.  Originally I had user_friendly_names enabled so I was using
> /dev/mapper/mpath0 as the device name.  I want to change that to
> reflect the LUN ID from the SAN so I disabled user_friendly_names and
> set alias to LUN34.  I rebooted the box but I do not see
> /dev/mapper/LUN34 and instead see /dev/mapper/<wwid>.  Does anyone see
> what I'm missing?  I can't figure out what I'm missing.  I've read the
> docs correctly and /dev/mapper/LUN34 should exist right?  Thanks.
> 
> tom

You're close.  If you re-enable user_friendly_names, multipathd will use
your *alias* as the UFN.  You'll get /dev/mapper/LUN34 as you expect.
Before you were using UFN but getting the default alias....

ccb


> 
> 
> multipath.conf
> ---
> devnode_blacklist {
>        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
>        devnode "^hd[a-z]"
> ## Only here in case we don't want a device created while testing
> #       devnode "^sd[a-z]"
>        devnode "^cciss!c[0-9]d[0-9]*"
> }
> 
> defaults {
>        udev_dir                                /dev
> #       user_friendly_names             yes
> }
> 
> multipaths {
>        multipath {
>                wwid                    360060160b606160000601cffa8b7db11
>                alias                   LUN34
>                no_path_retry           queue
>                path_grouping_policy    group_by_prio
>                hardware_handler        "1 emc"
>        }
> }
> 
> devices {
>        device {
>                vendor                  "DGC"
>                product                 "LUNZ"
>                getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
>        }
> }
> 
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