[dm-devel] Linux utility to determine WWN from a LUN number

[Chip Coldwell]

On Thu, 13 Mar 2008, lemons_terry at emc.com wrote:

> Hi
> 
> I want to have multipath manage only the CLARiiON LUN that I boot from (LUN 0).  So I know that I can specify the following in /etc/multipath.conf:
> 
> blacklist {
> 	wwid *
> 	}
> blacklist_exceptions {
> 	wwid nnnnnnnnnn
> 	}
> 
> The wwid value is different for every CLARiiON LUN.  So, if I want to automate the process of adding the 'wwid' value to the blacklist, what utility can I use to specify a LUN number, and find the WWN of the LUN?

I've written one.  Try it!

Easy way:

rpm -ivh http://people.redhat.com/coldwell/coldwell-release-0-1.noarch.rpm
yum install -y scsitool
scsitool --wwid --hbtl --devname

Alternately, you can download source/binaries:

http://people.redhat.com/coldwell/repo/RHEL/5/src/scsitool-0-4.src.rpm
http://people.redhat.com/coldwell/repo/RHEL/5/x86_64/scsitool-0-4.x86_64.rpm

etc.

Chip

-- 
Charles M. "Chip" Coldwell
Senior Software Engineer
Red Hat, Inc
978-392-2426

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