Re: Multi-Path MPIO and EMC

Also beware of numerous bugs regarding MPIO in AIX 5.2. Be sure to use the latest ML's, and you'll also need EMC's (free) ODM driver located on their FTP site. Best of luck!

-Brian

----- Original Message ----
From: Keith Stevenson <ktstevenson@xxxxxxxxxxxxxxx>
To: aix-l@xxxxxxxxxxxxx
Sent: Wednesday, February 13, 2008 7:25:25 AM
Subject: Re: [aix-l] Multi-Path MPIO and EMC


Larry,

AIX MPIO first became available in AIX 5.2, so you're going to need an upgrade just to get it. (There are lots of other reasons to move off of 5.1, but I won't belabor the point.)

Once you have MPIO, AIX will recognize that it can access a given device over multiple fscsi devices. It will present a single hdisk to LVM for use. The underlying paths can be seen via the lspath command.


Native MPIO uses a path failover algorithm. All access will drive down a single path unless communications are interrupted. Only then will it use an alternate path. More advanced algorithms (i.e. round-robin) are provided by the storage vendor's device specific driver. (In your case, PowerPath.)


Regards,
Keith Stevenson
IBM System Architect

On Feb 13, 2008 6:40 AM, Larry Scheetz <LScheetz@xxxxxxxxxxx> wrote:














Admins,








Does
anyone have documentation on setting up MPIO for Multi Path? I don't
have experience with this and need to setup a duel path for my disks on
EMC. Environemtn is a P630 (System Model: IBM,7028-6C4) running
AIX 5.1.0.0 and external disks on EMC box. I do not have Power-Path from
EMC. I do have two fiber connections to the EMC box and can see all the
disks via each path. From what I have read, MPIO would the trick
for me.





Thx


Larry





















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