VTAM Buffer Pool Extents Attributes
Use the VTAM® Buffer Pool Extents attributes to display the characteristics and status of the buffer pool extents.
Buffer Pool Name The name of the VTAM buffer pool. This value is displayed as a one of these character strings:
- IO00 - Input/Output message storage pool
- LP00 - Large pageable storage pool 2K buffers
- CRPL - Copied RPL storage pool
- SP00 - Small pageable storage pool
- LF00 - Large fixed storage pool
- SF00 - Small fixed storage pool
- AP00 - Buffer pool below the 16MB line
- XD00 - Pool XDBUF provides common storage for the I/O buffers used in exchange ID (XID) contact processing
- BS00 - Pool BSBUF provides common storage for the boundary Type 2.1, Type 2, and Type 1 peripheral node session control blocks
- CRA4 - Large pageable storage 4k buffers
- CRA8 - Large pageable storage 8k buffers
- TI00 - Input/Output control areas
- T100 - Input/Output control areas, including packing area for iQDIO
- T200 - Input/Output control areas, including a larger packing area than T100
Buffers Per Extent The number of buffers in the extent. The format is an integer.
Bytes Per Buffer The number of bytes per buffer. The format is an integer.
Collection Time The time and date of the data sampling. This time is displayed in the following format:
mm/dd/yy hh:mm:ss (Tivoli Enterprise Portal) or yy/mm/dd hh:mm:ss (3270)
Where:
- mm = Month
- dd = Day of the month
- yy = Year
- hh = Hour
- mm = Minute
- ss = Seconds
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:
- C = Century (0 for 20th, 1 for 21st)
- Y = Year
- M = Month
- D = Day
- H = Hour
- M = Minute
- S = Second
- m = Millisecond
End Address The ending address of the buffer pool extent. The format is a hexadecimal address.
Extent Block Address The pointer to the PXB control block. The format is a hexadecimal address.
Extent Number The relative extent number. The number starts at 1 and is incremented by 1 for each subsequent Pool Extension Block (PBX) on the chain. The format is an integer.
Free Buffers The number of free buffers in the extent. The format is an integer.
Pages Per Extent The number of pages per extent. The format is an integer.
Origin Node The unique identifier for the VTAM job being displayed. The format is an alphanumeric string no longer than 32 characters.
Percent Used The buffer utilization percentage. The format is an integer.
Start Address The address where the buffers begin in virtual storage for that extent. The format is a hexadecimal address.
Status The status of the extent. An extent is active as long as any its buffers are in use. An extent becomes inactive when VTAM frees the pages in that extent as a group. VTAM does not delete an inactive Pool Extension Block (PBX) but retains it for future reuse. Valid responses for this field are:
- Inactive
- Active
System ID The SMF system ID. The format is an alphanumeric string no longer than 4 characters.