CSVTAM_T1BUF_T2BUF

Description:

Checks to see whether the T1BUF and T2BUF buffer pool allocations for the system are adequate when Enterprise Extender (EE) are being used .

Reason for check:

The T1BUF and T2BUF buffer pools are used exclusively for Enterprise Extender (EE) functions that use QDIO or HyperSockets. When EE is being used with QDIO or HyperSockets DLCs, setting the T1BUF or T2BUF buffer pool allocations at their default values (16 for T1BUF and 8 for T2BUF) might not be optimal.

The T1BUF and T2BUF buffer pools should be monitored and tuned to minimize the number of expansions. Minimizing buffer pool expansions will decrease internal buffer overhead processing which should increase throughput while reducing CPU consumption. These buffer pools can be monitored using the D NET,BFRUSE,BUF=(T1,T2) command. Once the appropriate allocation values for the T1BUF and T2BUF buffer pools has been determined, you can change the T1BUF and T2BUF Start option allocation values.

z/OS® releases the check applies to:

z/OS V1R9 and later.

User override of IBM® values:

The following shows the default keywords for the check, which you can override on either a POLICY statement in the HZSPRMxx parmlib member or on a MODIFY command. This statement may be copied and modified to override the check defaults:

UPDATE
CHECK(IBMCS,CSVTAM_T1BUF_T2BUF_EE)
DATE('date_of_the_change')
REASON('Your reason for making the update.')
ACTIVE 
SEVERITY(LOW) 
INTERVAL(ONETIME)

Debug support:

Verbose support:

Parameters accepted:

Reference:

For more information on defining T1BUF and T2BUF parameters, see the Buffer Pool section of z/OS Communications Server: SNA Resource Definition Reference.

Messages:

This check issues the following exception messages:

ISTH013E

See z/OS Communications Server: SNA Messages.

SECLABEL recommended for multilevel security users:

SYSLOW - see z/OS Planning for Multilevel Security and the Common Criteria for information on using SECLABELs.