VTAM Buffer Usage By Category Attributes

Use the Buffer Pool Usage By Category attributes to monitor the usage of the IO00 buffer pool based on contents.

The IO00 buffer pool manages the storage of all network input/output messages sent from application programs and across channel connections. All network traffic passes through this pool, regardless of its destination. This buffer pool also contains channel programs used to service locally attached devices.

Because a great deal of activity takes place in the IO00 buffer pool, it is very sensitive to dynamic fluctuations in traffic rates. Consequently, it is a prime candidate for tuning. Examining the contents of this buffer pool can help a network capacity planner plan for more common storage area (CSA), understand how applications are using the pool, and understand the network traffic activity.

The values reported in this attribute table are obtained by processing the contents of the buffers themselves, and the VTAM control blocks are examined to determine which of the two categories each of the buffers in the IO00 pool is to be associated with.

Buffer Pool Category The VTAM IO00 buffer pool usage category. Valid responses are User Category or User Category 2 . Use the information below to determine the types of buffers in each user category:

Buffer Pool Name The name of the VTAM buffer pool. This value is always IO00 in this attribute group.

Collection Time The time and date of the data sampling. This time is displayed in the following format:

mm/dd/yy hh:mm:ss

Where:

The stored format is a string no longer than 16 characters in the format CYYMMDDHHMMSSmmm (as in 1020315064501000 for 03/15/02 06:45:01) where:

Description The description of the buffer based on the contents of the buffer. The format is an alphanumeric string no longer than 40 characters. This field can have the following values:

Origin Node The unique identifier for the VTAM node being displayed. The format is an alphanumeric string no longer than 32 characters.

Percent Percentage of the described buffer (which is based on its content) relative to the other buffers within its user category. The format is an integer.

System ID The SMF system ID. The format is an alphanumeric string no longer than 4 characters.