Display buffer pool use

You can use the DISPLAY BFRUSE command to display information about buffer use. In response to this command, VTAM® indicates that the display is for buffer use and issues a series of messages that contain monitoring information. For each buffer pool, this information includes:

Buffer pool ID
Flags (Q or F): Q shows that a request is queued for this pool; F shows that dynamic buffering has failed for this pool
Size of each buffer in this pool
Current® total number of buffers in this pool
Current count of buffers available (the number not in use)
Largest number of buffers this pool has expanded to at any time
Largest number of buffers in use at any time
Cumulative count of the number of times each buffer pool has expanded
Expansion and contraction thresholds
The expansion increment (the number of buffers to be added to a buffer pool during dynamic expansion)
VTAM intermediate routing node buffer use limit (IRNLIMIT), current buffer use, and maximum buffer use
VTAM CSA buffer use limit (CSALIMIT), current buffer use, and maximum buffer use
Maximum amount of CSA in use since VTAM was started
Current amount of VTAM private storage and maximum amount of VTAM private storage

If the DISPLAY BFRUSE command is used while an SMS (buffer use) trace is running, the fields MAX TOTAL, MAX USED, and TIMES EXP reflect buffer usage only since the last trace record was written, because the SMS trace resets these fields. For more information about the syntax and output of the DISPLAY BFRUSE command, see z/OS Communications Server: SNA Operation.

DISPLAY BFRUSE output can help you identify possible sources of problems. The following chart shows some problem symptoms and the corresponding buffers to check in SMS trace output:

For this symptom:	Check this buffer pool:
I/O hang	IOBUF
Session failure	CRPLBUF and LPBUF
VTAM hang	LPBUF

Storage problems can also be related to an I/O device. For further information, see Display workload information for a device.