If one is using the ibm 3584(aka TS3500) then the wwn does not changes on a 
straight up swap-out. The wwn goes with the slot in the library used to hold 
the tape drive and not the tape drive itself. And with lto-3 tape drives and 
better, Our IBM ce's have to update the new tape drive with the old tape 
drive's serial number as the maint contract tracks  enablement by the original 
serial number. So neither the wwn or serial numbers change.

len

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Richard Rhodes
Sent: Wednesday, August 19, 2009 9:42 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] LTO drive replacement when using switch zoning

If "replacing" the drive is truly a straight up swap-out, the the new drive
will have a new wwn that will need to be zoned in the san switch.  Then in
AIX it will show up as a new rmt device.






             "Gill, Geoffrey
             L."
             <GEOFFREY.L.GILL@                                          To
             SAIC.COM>                 ADSM-L AT VM.MARIST DOT EDU
             Sent by: "ADSM:                                            cc
             Dist Stor
             Manager"                                              Subject
             <[email protected]         LTO drive replacement when using
             .EDU>                     switch zoning


             08/18/2009 07:56
             PM


             Please respond to
             "ADSM: Dist Stor
                 Manager"
             <[email protected]
                   .EDU>






Hi all,



This situation has never happened to me before so I'm a little unsure of
the steps and order to fix it. Running AIX 5.3 with a TSM instance at
5.5.1. LTO drives are zoned in through a switch to the TSM server, 2
drives to each fibre card. Support for the IBM drives was not renewed
with IBM so it looks like this new group has no idea how to 'fix' drives
and would rather replace them, something that 'never' happened with IBM
so I'm not quite sure exactly what needs to be done to get this drive
back online.



I know the references in TSM need to be updated so I have removed the
path and drive. When adding them back the path failed so it seems like I
need to get AIX to see the new drive and not sure if I also need to do
anything on the switch. Unfortunately, or maybe fortunately, I typically
have no issues so it's hard to gain and keep knowledge when 98% of the
time I'm "watching" the system instead of "doing something" with it.
Since I don't have a test system built similarly I can't play around and
create documents to refer to when the 'what did I do when that happened'
scenario comes up.



Thanks for any advice you can provide.



Geoff Gill
TSM Administrator
PeopleSoft Sr. Systems Administrator
SAIC M/S-B1P
(858)826-4062 (office)

(858)412-9883 (blackberry)
Email: geoffrey.l.gill AT saic DOT com





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