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@db.com
973.682.3463
Theo Van Dinter
<felicity@kluge.n To: LVM general discussion and development <linux-lvm@redhat.com>
et> cc:
Sent by: Subject: Re: How to associate two paths for each EMC device?
linux-lvm-bounces
@redhat.com
03/19/2004 12:44
PM
Please respond to
LVM general
discussion and
development
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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