Subchannels For The Ficon Express16S; Extended Distance Ficon; Platform And Name Server Registration In Ficon Channel - IBM z13s Technical Manual

7.3.35 32 K subchannels for the FICON Express16S
To help facilitate growth and continue to enable server consolidation, the z13s supports up to
32 K subchannels per FICON Express16S channel (CHPID). More devices can be defined
per FICON channel, which includes primary, secondary, and alias devices. The maximum
number of subchannels across all device types that are addressable within an LPAR remains
at 63.75 K for subchannel set 0 and 64 K (64 X 1024)-1 for subchannel sets 1 and 2.
This support is exclusive to z13 and z13s servers and applies to the FICON Express16S
feature (defined as CHPID type FC). FICON Express8S and FICON Express8 remain at
24 subchannel support when defined as CHPID type FC.
Table 7-35 lists the minimum support requirements of 32 K subchannel support for FICON
Express.
Table 7-35 Minimum support requirements for 32K subchannel
Operating system
z/OS
z/VM
Linux on z Systems
a. PTFs are required.

7.3.36 Extended distance FICON

An enhancement to the industry-standard FICON architecture (FC-SB-3) helps avoid
degradation of performance at extended distances by implementing a new protocol for
persistent IU pacing. Extended distance FICON is transparent to operating systems and
applies to all FICON Express16S, FICON Express8S, and FICON Express8 features that
carry native FICON traffic (CHPID type FC).
To use this enhancement, the control unit must support the new IU pacing protocol. IBM
System Storage DS8000 series supports extended distance FICON for IBM z Systems
environments. The channel defaults to current pacing values when it operates with control
units that cannot use extended distance FICON.

7.3.37 Platform and name server registration in FICON channel

The FICON Express16S, FICON Express8S, and FICON Express8 features (on the zBC12
servers) support platform and name server registration to the fabric for CHPID types FC and
FCP.
Information about the channels that are connected to a fabric, if registered, allows other
nodes or storage area network (SAN) managers to query the name server to determine what
is connected to the fabric.
The following attributes are registered for the z13s servers:
Platform information
Channel information
Worldwide port name (WWPN)
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IBM z13s Technical Guide
Support requirements
a
z/OS V1R12
z/VM V6R2
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11
RHEL 7
RHEL 6