NJBUFF parameter - Revision history

DCameron: /* Description */

2015-08-25T13:01:40Z

Description

← Older revision		Revision as of 13:01, 25 August 2015
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	<tr><td>0 or is omitted</td><td>The default value is used.</td></tr>		<tr><td>0 or is omitted</td><td>The default value is used.</td></tr>

	<tr><td>1</td><td>Only one buffer and one channel program (NCP) is obtained. All puts and waits are synchronized. Recommended only when ~~NUSER~~=1.</td></tr>		<tr><td>1</td><td>Only one buffer and one channel program (NCP) is obtained. All puts and waits are synchronized. Recommended only when <var>[[NUSERS_parameter\|NUSERS]]</var>=1.</td></tr>

	<tr><td>Greater than <code>NSERVS + NSUBTKS + 1</code></td>		<tr><td>Greater than <code>NSERVS + NSUBTKS + 1</code></td>

DCameron: /* Summary */

2015-08-25T12:45:02Z

Summary

← Older revision		Revision as of 12:45, 25 August 2015
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	<dl>		<dl>
	<dt>Default value		<dt>Default value
	<dd>The default for z/OS and z/VM is <code><var>[[NSERVS_parameter\|NSERVS]]</var> + NSUBTKS + 1</code>. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.		<dd>The default for z/OS and z/VM is <code><var>[[NSERVS_parameter\|NSERVS]]</var> + <var>[[NSUBTKS_parameter\|NSUBTKS]]</var> + 1</code>. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.
	<dt>Parameter type		<dt>Parameter type
	<dd>System		<dd>System

DCameron: /* Summary */

2015-08-25T12:15:10Z

Summary

← Older revision		Revision as of 12:15, 25 August 2015
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	<dl>		<dl>
	<dt>Default value		<dt>Default value
	<dd>The default for z/OS and z/VM is <code>NSERVS + NSUBTKS + 1</code>. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.		<dd>The default for z/OS and z/VM is <code><var>[[NSERVS_parameter\|NSERVS]]</var> + NSUBTKS + 1</code>. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.
	<dt>Parameter type		<dt>Parameter type
	<dd>System		<dd>System

DCameron: /* Summary */

2015-08-25T12:13:56Z

Summary

← Older revision		Revision as of 12:13, 25 August 2015
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	<dd>All		<dd>All
	<dt>Introduced		<dt>Introduced
	<dd><var class="product">Model 204 V6.1</var> ~~or earlier~~		<dd><var class="product">Model 204 V2.1</var>
	</dl>		</dl>

JDamon: correction to meaning of NCP

2015-04-06T18:14:11Z

correction to meaning of NCP

JAL: remove Sys Man guide

2014-10-30T22:34:06Z

remove Sys Man guide

← Older revision		Revision as of 22:34, 30 October 2014
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	<dl>		<dl>
	<dt>Default value		<dt>Default value
	<dd>The default for z/OS and z/VM is NSERVS + NSUBTKS + 1. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.		<dd>The default for z/OS and z/VM is <code>NSERVS + NSUBTKS + 1</code>. The default for z/VSE is 1, because z/VSE does not support multiple journal buffers.
	<dt>Parameter type		<dt>Parameter type
	<dd>System		<dd>System
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	<dd>		<dd>
	<p>Cannot be reset</p>		<p>Cannot be reset</p>
	<p>In z/OS, the NJBUFF parameter can be set explicitly only via the PARM field in the EXEC card. See the ~~<var>Model 204 System Manager's Guide</var>~~.</p>		<p>In z/OS, the <var>NJBUFF</var> parameter can be set explicitly only via the PARM field in the EXEC card. See [[Defining the runtime environment (CCAIN)#Specifying EXEC statement parameters\|Specifying EXEC statement parameters]].</p>
	<p>In z/VM, the NJBUFF parameter is stacked in the EXEC that issues all the FILEDEFs.</p>		<p>
			In z/VM, the <var>NJBUFF</var> parameter is stacked in the EXEC that issues all the FILEDEFs.</p>
	<dt>Related products		<dt>Related products
	<dd>All		<dd>All
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	<dd><var class="product">Model 204 V6.1</var> or earlier		<dd><var class="product">Model 204 V6.1</var> or earlier
	</dl>		</dl>

	==Description==		==Description==
	<p>The NJBUFF parameter has a dual role of allocating the number of channel programs and journal buffers. </p>		<p>
	<p>NJBUFF can be 1, or NSERVS + NSUBTKS + 1, or any value larger than NSERVS + NSUBTKS + 1. Setting NJBUFF to a value greater than 1 invokes multiple journal buffers and ensures that a free buffer is always available for the journal. </p>		The <var>NJBUFF</var> parameter has a dual role of allocating the number of channel programs and journal buffers. </p>
	<p>In z/OS only, the NJBUFF setting is automatically recalculated when the setting is greater than 1 and less than or equal to NSERVS + NSUBTKS + 1. The initial value of NJBUFF is used to define the number of concurrent I/O operations (NCP) for the journal data set. Sizing NJBUFF to the value calculated in the formula guarantees the optimal number of NCP for the journal data set. </p>		<p>
	The NJBUFF parameter has the following options:		<var>NJBUFF</var> can be 1, or <code>NSERVS + NSUBTKS + 1</code>, or any value larger than <code>NSERVS + NSUBTKS + 1</code>. Setting <var>NJBUFF</var> to a value greater than 1 invokes multiple journal buffers and ensures that a free buffer is always available for the journal. </p>
			<p>
			In z/OS only, the <var>NJBUFF</var> setting is automatically recalculated when the setting is greater than 1 and less than or equal to <code>NSERVS + NSUBTKS + 1</code>. The initial value of <var>NJBUFF</var> is used to define the number of concurrent I/O operations (NCP) for the journal data set. Sizing <var>NJBUFF</var> to the value calculated in the formula guarantees the optimal number of NCP for the journal data set. </p>
			The <var>NJBUFF</var> parameter has the following options:
	<table>		<table>
	<caption>NJBUFF parameter options</caption>		<caption>NJBUFF parameter options</caption>
	<tr><th>NJBUFF=</th><th>Option</th></tr>		<tr class="head"><th>NJBUFF=</th><th>Option</th></tr>
	<tr><~~th><var~~>0 or is omitted</~~var></th~~><td>The default value is used.</td></tr>
	<tr><~~th><var~~>1</~~var></th~~><td>Only one buffer and one Network Control Program (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>		<tr><td>0 or is omitted</td><td>The default value is used.</td></tr>
	<tr><th><~~var~~>~~NJBUFF is greater than~~ NSERVS + NSUBTKS + 1</~~var~~></~~th><~~td>
	<p>The specified number of buffers is obtained.~~</p>~~		<tr><td>1</td><td>Only one buffer and one Network Control Program (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>

			<tr><td>Greater than <code>NSERVS + NSUBTKS + 1</code></td>
			<td>The specified number of buffers is obtained.
	<p>If the value is greater than 255 and 31-bit BSAM is allowed, only 255 NCPs are obtained.</p>		<p>If the value is greater than 255 and 31-bit BSAM is allowed, only 255 NCPs are obtained.</p>
	<p>If 31-bit BSAM is not allowed, on 99 NCPs are obtained.</p>		<p>If 31-bit BSAM is not allowed, on 99 NCPs are obtained.</p>
	<p>If the buffer number is larger than the NCPs, for example, NJBUFF=500, then 500 buffers are obtained, but only a maximum of NCP buffers are active. I/Os are checked only when they reach the NCP limit or when they are forced.</p>		<p>If the buffer number is larger than the NCPs, for example, <code>NJBUFF=500</code>, then 500 buffers are obtained, but only a maximum of NCP buffers are active. I/Os are checked only when they reach the NCP limit or when they are forced.</p>
	</td></tr>		</td></tr>
	<tr><~~th><var~~>For z/OS only: ~~If NJBUFF is greater~~ than one and less than or equal to NSERVS + NSUBTKS + 1.</~~var~~></~~th><~~td>
	<p>The value is recalculated by <var class="product">Model 204</var> as:<~~/p>~~		<tr><td>For z/OS only: <br/>Greater than one and less than or equal to <code>NSERVS + NSUBTKS + 1</code>.</td>
	<p>~~NJBUFF=~~NSERVS + NSUBTKS + 1</p>		<td>The value is recalculated by <var class="product">Model 204</var> as: <code>NSERVS + NSUBTKS + 1</code>
	<p>Message M204.0434 is issued.</p>		<p>Message <code>M204.0434</code> is issued.</p>
	</td></tr>		</td></tr>
	</table>		</table>

	[[Category:System parameters]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

DmeWiccan: Automatically generated page update

2013-08-27T16:40:43Z

Automatically generated page update

← Older revision		Revision as of 16:40, 27 August 2013
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			{{Template:NJBUFF parameter subtitle}}
	==Summary==		==Summary==
	<dl>		<dl>

ELowell: /* Description */

2013-06-26T00:14:36Z

Description

← Older revision		Revision as of 00:14, 26 June 2013
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	<tr><th>NJBUFF=</th><th>Option</th></tr>		<tr><th>NJBUFF=</th><th>Option</th></tr>
	<tr><th><var>0 or is omitted</var></th><td>The default value is used.</td></tr>		<tr><th><var>0 or is omitted</var></th><td>The default value is used.</td></tr>
	<tr><th ~~align="right"~~><var>1</var></th><td>Only one buffer and one Network Control Program (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>		<tr><th><var>1</var></th><td>Only one buffer and one Network Control Program (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>
	<tr><th><var>NJBUFF is greater than NSERVS + NSUBTKS + 1</var></th><td>		<tr><th><var>NJBUFF is greater than NSERVS + NSUBTKS + 1</var></th><td>
	<p>The specified number of buffers is obtained.</p>		<p>The specified number of buffers is obtained.</p>

DmeWiccan: Automatically generated page update

2013-04-23T01:51:12Z

Automatically generated page update

← Older revision		Revision as of 01:51, 23 April 2013
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	</td></tr>		</td></tr>
	</table>		</table>
	[[Category:System ~~Parameters~~]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

Dme: Undo revision 56901 by DmeWiccan (talk)

2013-04-19T15:15:42Z

Undo revision 56901 by DmeWiccan (talk)

← Older revision		Revision as of 15:15, 19 April 2013
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	</td></tr>		</td></tr>
	</table>		</table>
	[[Category:System ~~parameters~~]]		[[Category:System Parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

← Older revision		Revision as of 18:14, 6 April 2015
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	<var>NJBUFF</var> can be 1, or <code>NSERVS + NSUBTKS + 1</code>, or any value larger than <code>NSERVS + NSUBTKS + 1</code>. Setting <var>NJBUFF</var> to a value greater than 1 invokes multiple journal buffers and ensures that a free buffer is always available for the journal. </p>		<var>NJBUFF</var> can be 1, or <code>NSERVS + NSUBTKS + 1</code>, or any value larger than <code>NSERVS + NSUBTKS + 1</code>. Setting <var>NJBUFF</var> to a value greater than 1 invokes multiple journal buffers and ensures that a free buffer is always available for the journal. </p>
	<p>		<p>
	In z/OS only, the <var>NJBUFF</var> setting is automatically recalculated when the setting is greater than 1 and less than or equal to <code>NSERVS + NSUBTKS + 1</code>. The initial value of <var>NJBUFF</var> is used to define the number of ~~concurrent I/O operations~~ (NCP) for the journal data set. Sizing <var>NJBUFF</var> to the value calculated in the formula guarantees the optimal number of NCP for the journal data set. </p>		In z/OS only, the <var>NJBUFF</var> setting is automatically recalculated when the setting is greater than 1 and less than or equal to <code>NSERVS + NSUBTKS + 1</code>. The initial value of <var>NJBUFF</var> is used to define the number of channel programs (NCP) for the journal data set. Sizing <var>NJBUFF</var> to the value calculated in the formula guarantees the optimal number of NCP for the journal data set. </p>
	The <var>NJBUFF</var> parameter has the following options:		The <var>NJBUFF</var> parameter has the following options:
	<table>		<table>
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	<tr><td>0 or is omitted</td><td>The default value is used.</td></tr>		<tr><td>0 or is omitted</td><td>The default value is used.</td></tr>

	<tr><td>1</td><td>Only one buffer and one ~~Network Control Program~~ (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>		<tr><td>1</td><td>Only one buffer and one channel program (NCP) is obtained. All puts and waits are synchronized. Recommended only when NUSER=1.</td></tr>

	<tr><td>Greater than <code>NSERVS + NSUBTKS + 1</code></td>		<tr><td>Greater than <code>NSERVS + NSUBTKS + 1</code></td>
	<td>The specified number of buffers is obtained.		<td>The specified number of buffers is obtained.
	<p>If the value is greater than 255 and 31-bit BSAM is allowed, only 255 NCPs are obtained.</p>		<p>If the value is greater than 255 and 31-bit BSAM is allowed, only 255 NCPs are obtained.</p>
	<p>If 31-bit BSAM is not allowed, on 99 NCPs are obtained.</p>		<p>If 31-bit BSAM is not allowed, only 99 NCPs are obtained.</p>
	<p>If the buffer number is larger than the NCPs, for example, <code>NJBUFF=500</code>, then 500 buffers are obtained, but only a maximum of NCP buffers are active. I/Os are checked only when they reach the NCP limit or when they are forced.</p>		<p>If the buffer number is larger than the NCPs, for example, <code>NJBUFF=500</code>, then 500 buffers are obtained, but only a maximum of NCP buffers are active. I/Os are checked only when they reach the NCP limit or when they are forced.</p>
	</td></tr>		</td></tr>