Request Node Identification Data - IBM z13s Technical Manual

Support is also added for the D IOS,ZHPF system command to indicate whether zHPF is
enabled, disabled, or not supported on the server.
Similar to the existing FICON channel architecture, the application or access method provides
the channel program (CCWs). The way that zHPF (transport mode) manages channel
program operations is different from the CCW operation for the existing FICON architecture
(command mode). While in command mode, each CCW is sent to the control unit for
execution. In transport mode, multiple channel commands are packaged together and sent
over the link to the control unit in a single control block. Fewer processors are used compared
to the existing FICON architecture. Certain complex CCW chains are not supported by zHPF.
zHPF is available to z13, z13s, zEC12, zBC12, z196, z114, and System z10 servers. The
FICON Express8S, FICON Express8, and FICON Express16S (CHPID type FC) concurrently
support both the existing FICON protocol and the zHPF protocol in the server LIC.
zHPF is enhanced to allow all large write operations (> 64 KB) at distances up to 100 km to
be run in a single round trip to the control unit. This enhancement avoids elongating the I/O
service time for these write operations at extended distances. This enhancement to zHPF
removes a key inhibitor for clients adopting zHPF over extended distances, especially when
using the IBM HyperSwap® capability of z/OS.
Table 7-33 lists the minimum support requirements for zHPF.
Table 7-33 Minimum support requirements for zHPF
Operating system
z/OS
z/VM
Linux on z Systems
For more information about FICON channel performance, see the performance technical
papers on the z Systems I/O connectivity website at:
http://www.ibm.com/systems/z/hardware/connectivity/ficon_performance.html

7.3.34 Request node identification data

First offered on z9 EC, the request node identification data (RNID) function for native FICON
CHPID type FC allows isolation of cabling-detected errors.
Table 7-34 lists the minimum support requirements for RNID.
Table 7-34 Minimum support requirements for RNID
Operating system
z/OS
Support requirements
Single-track operations: z/OS V1R12.
Multitrack operations: z/OS V1R12 with PTFs.
64 K enhancement: z/OS V1R12 with PTFs.
z/VM V6.2 for guest use only.
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11 SP1
Red Hat RHEL 7
Red Hat RHEL 6
IBM continues to work with its Linux distribution partners on use of
appropriate z Systems (z13s, zBC12) functions to be provided in
future Linux on z Systems distribution releases.
Support requirements
z/OS V1R12
Chapter 7. Software support
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