Labeling Multipath drives

[Jeffrey O'brien]

>>> 
From: 	Kenny Lussier <klussier at gmail.com>
To:	"Jeffrey O'brien" <JObrien at expertserver.com>
CC:	<gnhlug-discuss at gnhlug.org>
Date: 	3/18/2009 7:44 PM
Subject: 	Re: Labeling Multipath drives

On Wed, Mar 18, 2009 at 9:54 AM, Jeffrey O'brien
<JObrien at expertserver.com>wrote:
>
>
> Kenny, you will need to install/configure the multipathing software.  Linux
> does have native mpath drivers which will create a virtual device from the
> mutliple devices shown so /dev/mpath/mpath0p1 would consist of /dev/sdc1,
> /dev/sdd1, etc...  look up "dm-multipath" for configuration setups for your
> environment.  The type of SAN you have too will play a role in configuration
> if the SAN has Active/Active or Active/Passive controllers, you may want to
> have an active/passive multipath configuration in the OS or an active/active
> setup.
>
> If you are using EMC FC SANs, you could always pay for powerpath as long as
> your wallet is deep ;)
>
> Also in your cluster have you looked at using a clustered filesystem so
> both systems have an active mount so you dont have to worry about mounting?
>  Generally a clustered filesystem is required for clusters, GFS, OCFS2,
> VxFS.
>
> Jeff
>

Jeff,

I'm using GFS on several systems. This particular filesystem, however,
cannot be mounted on more then one server at a time (long story, but it's a
security requirement). This is an HA cluster (pure failover) rather then a
distributed system.

Thanks,
Kenny

>>>

Sorry Kenny, that post about your security requirements came in after I sent my last reply.  My google foo is showing up some things regarding trying to mount multipath devices via label with dm-multipath.  It seems that you might want to try to mount by WWN or disk ID under /dev/mapper/WWN or UUID in your fstab.   Can you try that and have it work for your situation?

Thanks,
Jeff