Dana:

My favorite technique is to move the data (except load source) using the
*ENDALC and *MOVDTA technique. Then use DST to copy the load source. Cuts
the down time by quite a bit.

The second option if possible (same vendor for the storage?) is to simply
have the storage arrays replicate all the LUNS over to the new array. Once
that's done, simply change the zoning on the fibre network to point at the
new storage and bring it up.

Physically moving a LUN is simply not possible in a SAN since like IBM i,
you really don't know (or care) where the data really is.

--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Mitchell, Dana via MIDRANGE-L
Sent: Thursday, January 23, 2020 12:44 PM
To: midrange-l@xxxxxxxxxxxxxxxxxx
Cc: Mitchell, Dana <dmitche@xxxxxxxxxx>
Subject: Moving all systems to new external storage subsystems

Currently all of our i lpars are running on external storage behind 2 VIOs
in each box and we need to migrate to new external storage subsystems. A
while back I opened a PMR to IBM asking about migrating the load source and
there was a short discussion here about this kc article:
https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_72/rzaly/rzalylsnpr
ot.htm

Is there a different kc article that addresses doing this with external
storage? This one has a step:

Move the replacement disk unit.
1. Move the replacement disk unit that contains the load source
information into the slot where the old load source disk unit (unit 1)
originally resided.

Isn't that sort of a moot point since all the ldevs are vio hosted on
external storage? Perhaps just need to update the Tagged IO to the new
adapter that the new load source is attached to?

Also, is there a kc article that outlines moving all of the non-load source
volumes? Or is there nothing more to it than STRASPBAL *ENDALC and
*MOVDTA?

Thanks
Dana



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