VTAM Buffer Pool Summary workspace

The VTAM^(R) Buffer Pool Summary workspace summarizes use of buffer space by VTAM. VTAM uses buffer pools to control the buffering of data. It dynamically allocates and de-allocates space in these buffer pools for the VTAM control blocks, I/O buffers, and channel programs that control the transmission of data.

When you tune a buffer pool, you optimize the trade-off between CPU usage and the amount of storage allocated for a pool. If you specify a large buffer pool, you might waste storage but conserve CPU usage. If you specify a small pool, you might conserve storage but use the CPU for frequent expansion and contraction. With proper tuning, you can achieve a balance between storage use and performance that is suitable for your system.

This workspace is displayed when the VTAM Buffer Pool navigator item is selected.

Right-clicking on the Link icon in the VTAM Buffer Pool Summary table allows you to navigate to additional workspaces in context of the row that is selected. The additional workspaces include:

• VTAM Buffer Pool Details workspace (default)
• VTAM Buffer Pool Extents workspace
• VTAM Buffer Usage by Address Space workspace (IO00 and CRPL buffer pool types only)
• VTAM Buffer Usage by Category workspace (IO00 buffer pool type only)

This workspace displays the following views:

• Total Buffers: Displays a bar chart showing the buffers available and in use as a percentage of available buffers with a bar representing each buffer pool type, where:
  • Yellow represents the number of Buffers Available.
  • Blue represents the number of Buffers in Use.
• Pools with Requests Queued: Displays a bar chart showing the buffer pools with requests queued as a percentage of queued storage requests with a bar representing each buffer pool type.
• VTAM Buffer Pool Summary table: Contains summary data for all currently allocated VTAM buffer pools. The VTAM Buffer Pool Summary table reflects the overall condition of your VTAM buffer pools.