Ok, unloading multipath.
How do I deal with the issue of multiple paths to each drive?
I have four fc ports all connected to the san.

Sorry to appear dense, just not familiar with fiberchanel.



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Cameron Hanover
Sent: Friday, May 23, 2014 2:24 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] multipathing ts1120s under RHEL6

To expand on it slightly, add this option for modprobe once lin_tape is 
isntalled:
 options lin_tape alternate_pathing=1

http://publib.boulder.ibm.com/infocenter/tsminfo/v6/index.jsp?topic=%2Fcom.ibm.itsm.srv.doc%2Fc_multipath_io_support_unix.html

-
Cameron Hanover
chanover AT umich DOT edu

When any government, or church for that matter, undertakes to say to its 
subjects, this you may not read, this you must not see, this you are forbidden 
to know, the end result is tyranny and oppression, no matter how holy the 
motive.
--Robert A. Heinlein

On May 23, 2014, at 1:39 PM, Michael Prix <mp AT RS6000.DARKTECH DOT ORG> wrote:

> Gary,
> 
> dm-multipath is for diskdrives. You want to use lin_tape for the
> handling of the FC-attachment of the tape drives.
> 
> -- 
> Mit freundlichen Grüßen / Kind regards
> 
> Michael Prix
> 
> On 05/22/2014 09:14 PM, Lee, Gary wrote:
>> I am now attempting to share libraries containing IBM ts1120 drives between 
>> two tsm servers on HP hardware running RHEL 6.
>> 
>> It appears that I will need to use the dm-multipath system to manage the 
>> various fc paths to all the drives.
>> 
>> Got dm-multipath installed, but now trying to configure so it will see the 
>> drives.
>> Has anyone done this before and could you point me to some information?
>> I have the redhat manual for configuring dm-multipath. I am fairly new to FC 
>> so some help is appreciated.
>> The redhat book does not even mention tape, and can't find info on my drives 
>> in the places it mentions to look.
>> 
>> Thanks for any and all help.