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

[Shan Jing]

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?

Regards,
Shan Jing

Unix Group - Americas
Deutsche Bank
2 Gatehall Drive, 3rd Floor
Parsippany, New Jersey, USA
shan.jing at db.com
973.682.3463




                                                                                                                                       
                      Theo Van Dinter                                                                                                  
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                      03/19/2004 12:44                                                                                                 
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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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The following file(s) have been deleted by: Shan Jing on 3/19/2004 1:58:20 PM

C.DTF
attq5vht.dat





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