NUMBUFG parameter: Difference between revisions
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==Description== | ==Description== | ||
<p> | <p> | ||
Allocate | Allocate this number of buffer pool buffers above the bar (ATB).</p> | ||
<ul> | |||
<li>Prior to version 7.7 of Model 204: | |||
<p><var>NUMBUFG</var> specifies the number of buffer pool buffers built ATB, and the number of buffer pool buffers built BTB is based on the setting of <var>MINBUF</var>, <var>MAXBUF</var>, and <var>SPCORE</var>.</p></li> | |||
<li>As of version 7.7: | |||
<p>If <var>NUMBUFG</var> is specified, no buffer pool buffers are built BTB; all buffers are ATB. The <var>MINBUF</var> parameter is automatically reset to 0, and <var>MAXBUF</var> and <var>SPCORE</var> are ignored. </p></li> | |||
</ul> | |||
<p> | <p> | ||
The maximum number of buffers is <code>2**31/3</code>, or <code>715,827,882</code>, which limits buffer pools to 4.2 terabytes or less.</p> | The maximum number of buffers is <code>2**31/3</code>, or <code>715,827,882</code>, which limits buffer pools to 4.2 terabytes or less.</p> | ||
Revision as of 22:58, 17 August 2016
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.