SNA Services: Update TIBUF pool size and T1BUF pool size
Description
z/OS V2R2
reduces the number of buffers per page of storage for the following
buffer pools:
- TIBUF pool bufsize change
- The TIBUF pool contains control information to support HPDT services for HPR or IP. It is used to contain the HPR headers and the media, IP, and UDP headers for an Enterprise Extender connection. It is also used to contain data for APPC conversations.
- T1BUF pool bufsize change
- The T1BUF pool contains control information to support HPDT services for HPR or IP. It is similar to the TIBUF pool, but larger. It is used as a packing buffer by HiperSockets accelerator and QDIO. It is also used to contain the HPR headers and the media, IP, and UDP headers for an Enterprise Extender connection.
Table 1 provides more details about this migration action. Use this information to plan your changes to the system.
| Element or feature: | z/OS Communications Server. |
|---|---|
| When change was introduced: | z/OS V2R2. |
| Applies to migration from: | z/OS V2R1 and z/OS V1R13. |
| Timing: | Before the first IPL of z/OS V2R2. |
| Is the migration action required? | Yes, if you have modified the buffer pool values for the TIBUF pool or the T1BUF pool, and you might want to revisit your settings. |
| Target system hardware requirements: | None. |
| Target system software requirements: | None. |
| Other system (coexistence or fallback) requirements: | None. |
| Restrictions: | None. |
| System impacts: | Enterprise Extender performance degradation can result from poorly tuned buffers. |
| Related IBM® Health Checker for z/OS® check: | None. |
Steps to take
If you have tuned your systems to require a specific number of pages of TIBUF or T1BUF buffer storage, you might need to recalculate the number of pages required. For information, see Tuning Enterprise Extender specific buffer pools in z/OS Communications Server: SNA Network Implementation Guide.
Reference information
For information about how to adjust the value, see Tuning Enterprise Extender specific buffer pools in z/OS Communications Server: SNA Network Implementation Guide.
For
more information, see the following references: