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List:       aix-l
Subject:    Re: AIX/SAN Storage
From:       Jonathan Fosburgh <syjef () MAIL ! MDANDERSON ! ORG>
Date:       2005-05-03 20:44:59
Message-ID: 200505031544.59335.syjef () mail ! mdanderson ! org
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On Tuesday 03 May 2005 13:53, N N wrote:
> A single HBA AIX SAN connected system plugged into port #1 of a Fibre
> Switch.  If the fiber connection is moved from port #1 to port #2 the Fiber
> channel D_ID (destination ID) changes.  I have heard that at times AIX will
> see the existing SAN LUNS as new hdisk devices (when cfgmgr is run) because
> of the different D_ID.  I have moved SAN ports for AIX systems plenty of
> times and have never seen this when going to a Shark or FAStT.  Has anyone
> experienced this?  EMC or IBM storage?
>
My experience is that IT DEPENDS(tm).  If the FCID of the port changes then
AIX will probably lose track of the devices.  But, I have seen that turning
off the system before making the move will sometimes allow the change to be
seen and the devices will come back.  Note that this has been inconsistent
for me.  Far better is to enable persistant FCIDs on the switch if supported,
and/or enable dynamic tracking on the HBA if it is supported.  YMMV though,
persistant FCIDs is your best bet.

--
Jonathan Fosburgh
AIX and Storage Administrator
UT MD Anderson Cancer Center
Houston, TX
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