Session Problem 10
Response time or file transfer time increases significantly.
Solutions:
1.
Use SNANCP SHOW commands to check the following:
•
Number of sessions active
SNANCP> SHOW ACTIVE LUS
In general, the more LUs that are in session, the slower the
performance.
•
Possible line retransmissions
SNANCP> SHOW CIRCUIT
circuit-id COUNTERS
Look at the line and circuit counters for abnormally high error rates.
•
Number of transmission errors
SNANCP> SHOW LINE
line-id COUNTERS
Look at the number of transmission errors. Excessive retransmissions
and CRC errors are a sign of noisy lines. Report the problem to your
operations manager.
2.
Use SNANCP commands to check the following:
•
The MODEM parameter (this should be normal if you are not using
IBM diagnostic modems)
SNANCP> SHOW LINE
line-id CHARACTERISTICS
Do not specify a modem type of diagnostic unless you are using
diagnostic modems.
•
Check the adequacy of your host system resources. Probable causes of
slowed response time at a DECnet node are the following:
•
Number of users
•
Number of communication lines
•
SNATRACE circuit-level trace being run
•
Line speed of DECnet lines to Gateway-ST
•
Decrease in IBM response time due to system load or a program’s
priority (for example, heavy RJE activity). (See Session Problem
5.)
1–52 Solving DECnet SNA Gateway for Synchronous Transport Problems
