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HP OpenVMS Systems Documentation

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HP OpenVMS System Management Utilities Reference Manual


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Because the VIRTUALPAGECNT setting supports hardware address space rather than system memory, do not use the value of VIRTUALPAGECNT that AUTOGEN sets to gauge the size of your page file.

Starting with OpenVMS Version 7.0, VIRTUALPAGECNT has been an obsolete parameter on Alpha systems. Note, however, that the parameter remains in existence on Alpha and Integrity servers for compatibility purposes and has a default and maximum value of %X7FFFFFFF. SYSBOOT and AUTOGEN enforce this default value.

VMS*

VMSD1, VMSD2, VMSD3, VMSD4, VMS5, VMS6, VMS7, and VMS8 are special parameters reserved for HP use. VMSD1 through VMSD4 are DYNAMIC.

VOTES (A)

VOTES establishes the number of votes an OpenVMS Cluster member system contributes to a quorum.

WBM_MSG_INT (D)

WBM_MSG_INT is one of three system parameters that are available for managing the update traffic between a master write bitmap and its corresponding local write bitmaps in an OpenVMS Cluster system. The others are WBM_MSG_UPPER and WBM_MSG_LOWER. These parameters set the interval at which the frequency of sending messages is tested and also set an upper and lower threshold that determine whether the messages are grouped into one SCS message or are sent one by one.

In single-message mode, WBM_MSG_INT is the time interval in milliseconds between assessments of the most suitable write bitmap message mode. In single-message mode, the writes issued by each remote node are, by default, sent one by one in individual SCS messages to the node with the master write bitmap. If the writes sent by a remote node reach an upper threshhold of messages during a specified interval, single-message mode switches to buffered-message mode.

In buffered-message mode, WBM_MSG_INT is the maximum time a message waits before it is sent. In buffered-message mode, the messages are collected for a specified interval and then sent in one SCS message. During periods of increased message traffic, grouping multiple messages to send in one SCS message to the master write bitmap is generally more efficient than sending each message separately.

The minimum value of WBM_MSG_INT is 10 milliseconds. The maximum value is -1, which corresponds to the maximum positive value that a longword can represent. The default is 10 milliseconds.

WBM_MSG_LOWER (D)

WBM_MSG_LOWER is one of three system parameters that are available for managing the update traffic between a master write bitmap and its corresponding local write bitmaps in an OpenVMS Cluster system. The others are WBM_MSG_INT and WBM_MSG_UPPER. These parameters set the interval at which the frequency of sending messages is tested and also set an upper and lower threshold that determine whether the messages are grouped into one SCS message or are sent one by one.

WBM_MSG_LOWER is the lower threshold for the number of messages sent during the test interval that initiates single-message mode. In single-message mode, the writes issued by each remote node are, by default, sent one by one in individual SCS messages to the node with the master write bitmap. If the writes sent by a remote node reach an upper threshhold of messages during a specified interval, single-message mode switches to buffered-message mode.

The minimum value of WBM_MSG_LOWER is 0 messages per interval. The maximum value is -1, which corresponds to the maximum positive value that a longword can represent. The default is 10.

WBM_MSG_UPPER (D)

WBM_MSG_UPPER is one of three system parameters that are available for managing the update traffic between a master write bitmap and its corresponding local write bitmaps in an OpenVMS Cluster system. The others are WBM_MSG_INT and WBM_MSG_LOWER. These parameters set the interval at which the frequency of sending messages is tested and also set an upper and lower threshold that determine whether the messages are grouped into one SCS message or are sent one by one.

WBM_MSG_UPPER is the upper threshold for the number of messages sent during the test interval that initiates buffered-message mode. In buffered-message mode, the messages are collected for a specified interval and then sent in one SCS message.

The minimum value of WBM_MSG_UPPER is 0 messages per interval. The maximum value is -1, which corresponds to the maximum positive value that a longword can represent. The default is 100 seconds.

WBM_OPCOM_LVL (D)

WBM_OPCOM_LVL controls whether write bitmap system messages are sent to the operator console. Possible values are shown in the following table:
Value Description
0 Messages are turned off.
1 The default; messages are provided when write bitmaps are started, deleted, and renamed, and when the SCS message mode (buffered or single) changes.
2 All messages for a setting of 1 are provided plus many more.

WINDOW_SYSTEM (D)

WINDOW_SYSTEM specifies the windowing system to be used on a workstation. Specify one of the following values:
Value Description
1 Load the DECwindows Motif for OpenVMS workstation environment.
2 Load the UIS workstation environment.

WLKSYSDSK

(Alpha and Integrity servers) WLKSYSDSK is used by various bootstrap components to determine if the system disk should be treated as though it is write-locked. This parameter is used primarily to allow OpenVMS to boot from a CD.

WPRE_SIZE (D)

WPRE_SIZE represents the number of pages to be allocated to accommodate WatchPoint Recovery Entries (WPRE) on the Watchpoint Driver.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

WPTTE_SIZE (D)

WPTTE_SIZE is the number of entries that the WPDRIVER creates in the WatchPoint Trace Table.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

WRITABLESYS

WRITABLESYS controls whether system code is writable. This parameter is set (value of 1) for debugging purposes only.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

WRITESYSPARAMS (D)

On Alpha and Integrity servers, WRITESYSPARAMS indicates that parameters are modified during SYSBOOT and are written out to ALPHAVMSSYS.PAR by STARTUP.COM.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

WSDEC (A,D,M)

Increasing the value of this parameter tends to increase the speed with which working set limits are decreased when the need arises.

On Alpha and Integrity servers, WSDEC specifies the number of pagelets by which the limit of a working set is automatically decreased at each adjustment interval (which is quantum end). At a setting of 35, for example, the system decreases the limit of a working set by 35 pagelets each time a decrease is required.

WSINC (A on Alpha and Integrity servers,D,M)

Decreasing the value of this parameter tends to reduce the speed with which working set limits are increased when the need arises. Normally, you should keep this parameter at a high value because a rapid increase in limit is often critical to performance.

On Alpha and Integrity servers, WSINC specifies the number of pagelets by which the limit of a working set is automatically increased at each adjustment interval (which is quantum end). At a setting of 150, for example, the system increases the limit of a working set by 150 pagelets each time an increase is required. On Alpha and Integrity servers, the default value is 2400 512-byte pagelets (150 8192-byte Alpha and Integrity server pages).

A value of 0 for WSINC disables the automatic adjustment of working set limits for all processes. Limits stay at their base values. You can disable the automatic adjustment of working set limits on a per-process basis by using the DCL command SET WORKING_SET.

WSMAX (A,G,M)

WSMAX sets the maximum number of pages on a systemwide basis for any working set. WSMAX is calculated as a quarter of the first 32 MB plus a sixteenth of the memory from 32 to 256 MB, plus a sixty-fourth of the memory (if any) above 256 MB.

This is intended to assist managers of systems that host large numbers of users whose working sets are not large. Systems whose user bases consist of a small number of users (or processes) that require large amounts of physical memory (for example, simulations) might need to set MIN_WSMAX to a value that satisfies the requirements of those processes.

XQPCTL2

XQPCTL2 controls improved concurrency. The default value of XQPCTL2 is 1, which turns on improved concurrency. Setting XQPCTL2 to 0 turns off improved concurrency. This parameter affects local access to the extent and file ID caches.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

XQPCTLD1

XQPCTLD1 controls multithreading, which can be used only by PATHWORKS servers. The default value of XQPCTLD1 is 8, which enables multithreading. Setting XQPCTLD1 to 0 disables multithreading,

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.

ZERO_LIST_HI (A,D)

(Alpha and Integrity servers) ZERO_LIST_HI is the maximum number of pages zeroed and put on the zeroed page list. This list is used as a cache of pages containing all zeros, which improves the performance of allocating such pages.


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