z/OS® V2R1 Communications
Server simplifies the configuration of the progressive-mode adaptive
rate-based (ARB) flow control algorithm on predefined EE Physical
Units (PUs). This flow control algorithm improves the performance
in virtualized or CPU-constrained environments. You can configure
HPREEARB on the GROUP definition statement in the switched major node
for predefined EE (Enterprise Extender) connections. As usual, you
can also specify the HPREEARB parameter on the following items:
- The PU definition statement in the switched or model (DYNTYPE=EE)
major nodes
- The connection network GROUP definition statements in the EE XCA
major node
Restriction: Progressive-mode ARB applies only to
one-hop HPR pipes that traverse EE connections, which includes a single
physical hop across a two-hop EE virtual routing node (VRN).
Implementing the progressive-mode ARB flow control
algorithm for predefined EE PUs
To implement the progressive-mode
ARB flow control algorithm for predefined EE PUs, perform the appropriate
tasks in Table 1.Table 1. Simplified configuration for progressive
mode ARB | Task |
Reference |
|---|
| Designate that progressive-mode ARB is to be
used for a predefined EE connection by specifying HPREEARB=PROGRESS
on the GROUP or PU definition statement in the switched major node. |
Switched major node
operand HPREEARB in z/OS Communications Server: SNA Resource Definition
Reference |
| Designate that progressive-mode ARB is not to
be used for a predefined EE connection by specifying HPREEARB=HPRARB
on the GROUP or PU definition statement in the switched major node. |
Switched major node
operand HPREEARB in z/OS Communications Server: SNA Resource Definition
Reference |
Determine which ARB mode is being used for a
specific HPR pipe by performing the following steps: - Issue the DISPLAY ID=rtp_pu,HPRDIAG=YES command.
- Locate the ARB information in the HPRDIAG output.
You can know the status by checking the messages: - If message IST1697I is present, the responsive-mode ARB algorithm
is being used.
- If message IST2267I is present, the progressive-mode ARB algorithm
is being used.
- If message IST2395I is present, the base-mode ARB algorithm is
being used.
|
See the following topics:
|