VTAM problem determination

Each type of VTAM problem has a corresponding set of actions to take.

Table 1 lists sample problems that may occur in VTAM. The appropriate actions are explained in Table 2.

VTAM problem types

Table 1. VTAM problem types and appropriate actions
Symptom	Problem type	Action
abend message	abend	Perform A
Activating network nodes takes too long	Performance	Perform B
Application program reports an unexpected return or sense code	Incorrect output or message	Perform C
Deactivating network nodes takes too long	Performance	Perform B
Error message	Message	Perform C
Hung session, LU, or terminal	Incorrect output	Perform D
Hung system	Wait	Perform E
IST error message	Message	Perform C
LOGON takes too long to complete	Performance	Perform B
Performance is degraded after a network outage	Performance	Perform B
Response time is slow	Performance	Perform B
Storage message IST154I or IST561I-IST566I	Storage	Perform F

Actions

Table 2 lists and describes the appropriate actions to perform for further diagnostic information.

Table 2. Appropriate actions
Action	Description
A	Collect the following documentation: Dump output LOGREC Symptom string Abend or system completion code Contents of the general registers (at the time of the abend) PSW (at the time of the abend) VTAM internal trace (at the time of the abend) Note: LOGREC is the log recording data set used by z/OS. Any abend that occurs is recorded here. In addition, hardware failures are reported in LOGREC.
B	Collect the following documentation: System console log Error file output in LOGREC SMS (buffer use) trace output
C	Collect the following documentation: Issuing module Message number System console log VTAM internal trace output
D	Collect the following documentation: VTAM internal trace output (all except LOCK) Generalized trace facility CCWTRACE output
E	Collect the following documentation: I/O trace output Buffer contents trace output Dump of the VTAM primary address space including the common service area (CSA) Output from the VTAM internal trace (all options except LOCK)
F	Collect the following documentation: Full VTAM dump