Number of above-the-bar buffers
- Default value
- Parameter type
- Where set
- Not resettable
- Related products
- Model 204 V7.1
Allocate this number of buffer pool buffers above the bar (ATB).
- Prior to version 7.7 of Model 204:
- As of version 7.7:
If NUMBUFG is specified, no buffer pool buffers are built BTB; all buffers are ATB. Model 204 obtains exactly the NUMBUFG number of buffers.
In this case, NUMBUFG essentially replaces the BTB parameters: NUMBUF and MINBUF are automatically reset to 0, and MAXBUF and SPCORE are ignored.
The maximum number of buffers is
715,827,882, which limits buffer pools to 4.2 terabytes or less.
The minimum number of ATB buffers is:
If you set NUMBUFG to a value lower than the minimum, the value is reset to the calculated value and you receive messages like the following:
*** M204.2756: NUMBUFG reset to NLRUQG * ((NSERVS + NSUBTKS) * MAXOBUF + 15) = 1 * ((2+9) * 4 + 15) = 59 *** M204.0075: Initialization completed. Buffers = 0+59
If you set NUMBUFG greater than 0:
For more information about setting NUMBUFG, see Using 64-bit addressing and Above the Bar (ATB) storage.