NUMBUFG parameter

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Number of above-the-bar buffers

Summary

Default value
0
Parameter type
System
Where set
Not resettable
Related products
All
Introduced
Model 204 V7.1

Description

Allocate this number of buffer pool buffers above the bar (ATB).

  • Prior to version 7.7 of Model 204:

    NUMBUFG specifies the number of buffer pool buffers built ATB, and the number of buffer pool buffers built BTB is based on the setting of MINBUF, MAXBUF, and SPCORE.

  • As of version 7.7:

    If NUMBUFG is specified, no buffer pool buffers are built BTB; all buffers are ATB. The MINBUF parameter is automatically reset to 0, and MAXBUF and SPCORE are ignored.

The maximum number of buffers is 2**31/3, or 715,827,882, which limits buffer pools to 4.2 terabytes or less.

For background information, see Disk buffers and Model 204 storage.

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