SNAX/HLS Configuration and Control Manual

D-Series and C-Series Networking Restrictions
Supplemental Information for D-Series Systems
D–2 104705 Tandem Computers Incorporated
D-Series and C-Series
Networking
Restrictions
D-series SNAX/HLS follows the rules and conventions that govern network
communication and compatibility between D-series software, C-series software, and B-
series software.
D-series SNAX/HLS runs only on the D-series operating system. However, D-series
SNAX/HLS processes running at a low PIN can directly communicate with C-series
systems.
If D-series SNAX/HLS is running at a high PIN, SNAX/XF and SNAX/CDF must be
capable of communicating with high-PIN requestors.
C-series SNAX/HLS can run on either C-series or D-series operating systems, but
cannot run at a high PIN on the D-series system.
C-series HLSCOM can control and interrogate a high-PIN SNAX/HLS server on a D-
series operating system. This is because HLSCOM communicates through SCP, which
is running at a low PIN on the D-series system.
High-PIN Support by
SNAX/HLS
D-series SNAX/HLS supports the high PINs in D-series systems.
The default value of the BINDER HIGHPIN flag in the HLSOBJ file and the HUXOBJ
file is ON. As a result, new processes are automatically assigned to run at a high PIN
(if a high PIN is available). In a network composed only of D-series systems, running
at a high PIN may be desirable.
To start a SNAX/HLS server process at a high PIN, set the value of the BINDER
HIGHPIN flag to ON in both the HLSOBJ and HUXOBJ files.
To start the SNAX/HLS server process at a low PIN, set the BINDER HIGHPIN flag to
OFF in either the HLSOBJ or the HUXOBJ file.
For additional information refer to the D-series supplement to Tandem’s BINDER
Manual.
Configuration
Parameters
The C-series SNAX/HLS server process is limited in the number of openers and
sessions that it can support, based on the checkpointable space available.
The checkpointable space available in D-series SNAX/HLS is much greater than in the
C-series. Therefore a larger value can be assigned to the MAX-POCB and MAX-LUS
startup parameters.
However, keep in mind the performance and certain parameters that are related to all
Guardian processes (such as Process File Segment), and use care in selecting the values
for MAX-POCB and MAX-LUS parameters.