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Re: [linux-lvm] How to associate two paths for each EMC device?

The very basic way to identify the pair is to lvm each of the first 22 luns in a sequence and see which lun in the other 22 set is also lvm'ed.

However, there must be a more technical way to resolve this and eventually make the disk represent only once.  Any guru out there can help?

Shan Jing

Unix Group - Americas
Deutsche Bank
2 Gatehall Drive, 3rd Floor
Parsippany, New Jersey, USA
shan jing db com

                      Theo Van Dinter                                                                                                  
                      <felicity kluge n        To:       LVM general discussion and development <linux-lvm redhat com>                 
                      et>                      cc:                                                                                     
                      Sent by:                 Subject:  Re: [linux-lvm] How to associate two paths for each EMC device?               
                      03/19/2004 12:44                                                                                                 
                      Please respond to                                                                                                
                      LVM general                                                                                                      
                      discussion and                                                                                                   

On Fri, Mar 19, 2004 at 12:21:51PM -0500, Shan Jing wrote:
> I have 22  EMC symmetrix disks on two HBA links.  At this moment, there is no working copy of EMC powerpath or HP Securepath available for my kernel (2.4.21-112-itanium2-smp); therefore, I have to use the luns directly with lvm without any DMP software in the middle.
> Without DMP software, there are two set of 22 luns, each representing one HBA path.  See blow.

Can you set your HBA driver to do failover?   ie: something like this
in modules.conf:

options qla2300 ql2xfailover=1 ql2xmaxqdepth=64

This works well for my servers connected to a CX-series array. :)   The
driver handles failing between HBAs (active-passive), and only has the
LUN presented once to the system.

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