Worldwide Port Name Tool - IBM z13s Technical Manual

The IOCS file contains detailed information for each channel and path assignment, each
control unit, and each device in the configuration.

7.13 Worldwide port name tool

Part of the installation of your z13s system is the pre-planning of the SAN environment. IBM
has a stand-alone tool to assist with this planning before the installation.
The capabilities of the WWPN are extended to calculate and show WWPNs for both virtual
and physical ports ahead of system installation.
The tool assigns WWPNs to each virtual FCP channel/port by using the same WWPN
assignment algorithms that a system uses when assigning WWPNs for channels using NPIV.
Therefore, the SAN can be set up in advance, allowing operations to proceed much faster
after the server is installed. In addition, the SAN configuration can be retained instead of
altered by assigning the WWPN to physical FCP ports when a FICON feature is replaced.
The WWPN tool takes a .csv file that contains the FCP-specific I/O device definitions and
creates the WWPN assignments that are required to set up the SAN. A binary configuration
file that can be imported later by the system is also created. The .csv file can either be
created manually, or exported from the HCD/HCM.
The WWPN tool on z13s (CHPID type FCP) requires the following levels:
z/OS V1R12 and later
z/VM V6R2 and later
The WWPN tool is applicable to all FICON channels that are defined as CHPID type FCP (for
communication with SCSI devices) on z13s. It is available for download at the Resource Link
at the following website:
http://www.ibm.com/servers/resourcelink/
Note: An optional feature can be ordered for WWPN persistency before shipment to keep
the same I/O serial number on the new CEC. Current information must be provided during
the ordering process.
7.14 ICKDSF
Device Support Facilities (ICKDSF) Release 17 is required on all systems that share disk
subsystems with a z13s processor.
ICKDSF supports a modified format of the CPU information field that contains a two-digit
LPAR identifier. ICKDSF uses the CPU information field instead of CCW reserve/release for
concurrent media maintenance. It prevents multiple systems from running ICKDSF on the
same volume, and at the same time allows user applications to run while ICKDSF is
processing. To prevent data corruption, ICKDSF must be able to determine all sharing
systems that can potentially run ICKDSF. Therefore, this support is required for z13s.
Remember: The need for ICKDSF Release 17 applies even to systems that are not part of
the same sysplex, or are running an operating system other than z/OS, such as z/VM.
Chapter 7. Software support
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