Chapter 5. Migration considerations 103
Once the PCHID values assigned by the CHPID Mapping Tool have been merged with the
IODF, it needs to be re-validated with HCD option 2.12.
You should now print a CTC connection report. If you have any FICON CTCs that loop
back (that is, both ends of the FICON CTC connection are on the same processor) either
via direct connection or via a switch, then you may need to change the CUADD value on
the control unit definitions if the target is an LPAR that resides in a LCSS other than
LCSS 0. The high-order 4 bits of the CUADD field should reflect the target LCSS. The
low-order 4 bits should reflect the MIF Image id of the target LPAR. The CUADD value is
displayed in the Logical Address field on the HCD screen and can be changed with HCD
option 1.4.c.
14.The work IODF can now be used to create a Production IODF with HCD Option 2.1.
15.When the hardware is installed, the IOCDS can be created for the target z990 processor. If
the new z990 has been connected as part of a microprocessor cluster and has been
defined with the network name and CPC name coded in the processor definition, the
IOCDS can be created on the target machine using HCD option 2.2. If the new z990 is not
part of a microprocessor cluster, the IOCP source statements need to be created with
HCD option 2.3 and transferred to the HMC.
Traditionally this has been done with diskettes; however, some large I/O configurations
may exceed the capacity of a diskette. If this situation should arise, the file should be
transformed into a zip file and stored on a diskette. The diskette can then be used as input
to the standalone IOCP program on the z990 for creation of the IOCDS. (Alternately, you
could ftp the file to the new HMC.)
16.The Reset, Image and Load profiles for the z990 operational environment can be
customized from the HMC. When the Image profiles are created, care should be taken to
assign the correct
LPAR id to each logical partition. The LPAR id is not the same as the
MIF Image id assigned in the HCD partition definition. The LPAR id is used primarily by
the STSI and STIDP instructions (usually for ISV software licensing) and also by the
CFRM support in z/OS for identifying the CFCC partitions. You might want to consider
establishing a naming convention for your LPAR ids, as suggested in LPARs on page 66.
17. Perform a Power-on Reset (POR) of the z990 server.
18. Images on the z990 server can now be IPLed.
5.3.2 Upgrading an existing z900 to a z990 processor
This procedure documents a recommended process that you should follow if you are
upgrading from z900 to a z990 processor. The process is summarized in Figure 5-2 on
page 104 and described in the steps that follow.
Important: Be aware that you will also have to do a similar change for the control unit
CUADD value on any other processors that will communicate with the z990 over FICON
CTC links.
Tip: We recommend that you define and connect your z900 and z990 processors as
part of a microprocessor cluster to allow an IOCDS to be created directly from any
system without the need for manual file transfer.

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