OpenVMS System Management Utilities Reference Manual

Figure H-21 illustrates the format of the SCS class record. Table H-21 describes the fields in the data block for the SCS class record.

Figure H-21 SCS Class Record Format

Table H-21 Descriptions of SCS Class Record Fields
Field Symbolic Offset Contents

Node Name MNR_SCS$T_NODENAME Name of remote cluster node (counted ASCII string) (8 bytes,I)

Datagrams Sent MNR_SCS$L_DGSENT Count of datagrams sent to the remote node (longword,C)

Datagrams Received MNR_SCS$L_DGRCVD Count of datagrams received from the remote node (longword,C)

Datagrams Discarded MNR_SCS$L_DGDISCARD Count of datagrams discarded by the CI port driver (longword,C)

Sequenced Messages Sent MNR_SCS$L_MSGSENT Count of sequenced messages sent to the remode node (longword,C)

Seqenced Messages Received MNR_SCS$L_MSGRCVD Count of sequenced messages received from the remote node (longword,C)

Block Transfer
Send-data commands MNR_SCS$L_SNDATS Count of block transfer send-data commands initiated on the local node, targeted for the remote node (longword,C)

Kilobytes Sent by
Send-data commands MNR_SCS$L_KBYTSENT Count of kilobytes sent as a result of send-data commands (longword,C)

Block Transfer Request-
data commands MNR_SCS$L_REQDATS Count of block transfer request-data commands initiated on the local node, targeted for the remote node (longword,C)

Kilobytes Received by
Request-data commands MNR_SCS$L_KBYTREQD Count of kilobytes received as a result of request-data commands (longword,C)

Block Transfer
Kilobytes Mapped MNR_SCS$L_KBYTMAPD Count of kilobytes mapped for block transfers (longword,C)

Connections Queued For
Send Credit MNR_SCS$L_QCRCNT Count of times connections are queued for send credits (longword,C)

Connections Queued For
Buffer Descriptor MNR_SCS$L_QBDTCNT Count of times connections are queued for buffer descriptors (longword,C)

**Table H-21 Descriptions of SCS Class Record Fields**
Field	Symbolic Offset	Contents
Node Name	MNR_SCS$T_NODENAME	Name of remote cluster node (counted ASCII string) (8 bytes,I)
Datagrams Sent	MNR_SCS$L_DGSENT	Count of datagrams sent to the remote node (longword,C)
Datagrams Received	MNR_SCS$L_DGRCVD	Count of datagrams received from the remote node (longword,C)
Datagrams Discarded	MNR_SCS$L_DGDISCARD	Count of datagrams discarded by the CI port driver (longword,C)
Sequenced Messages Sent	MNR_SCS$L_MSGSENT	Count of sequenced messages sent to the remode node (longword,C)
Seqenced Messages Received	MNR_SCS$L_MSGRCVD	Count of sequenced messages received from the remote node (longword,C)
Block Transfer Send-data commands	MNR_SCS$L_SNDATS	Count of block transfer send-data commands initiated on the local node, targeted for the remote node (longword,C)
Kilobytes Sent by Send-data commands	MNR_SCS$L_KBYTSENT	Count of kilobytes sent as a result of send-data commands (longword,C)
Block Transfer Request- data commands	MNR_SCS$L_REQDATS	Count of block transfer request-data commands initiated on the local node, targeted for the remote node (longword,C)
Kilobytes Received by Request-data commands	MNR_SCS$L_KBYTREQD	Count of kilobytes received as a result of request-data commands (longword,C)
Block Transfer Kilobytes Mapped	MNR_SCS$L_KBYTMAPD	Count of kilobytes mapped for block transfers (longword,C)
Connections Queued For Send Credit	MNR_SCS$L_QCRCNT	Count of times connections are queued for send credits (longword,C)
Connections Queued For Buffer Descriptor	MNR_SCS$L_QBDTCNT	Count of times connections are queued for buffer descriptors (longword,C)

H.4.2.15 STATES Class Record

The STATES class record contains data describing the number of processes in each of the scheduler states. The STATES class record has a record type of 1 and a size of 69 bytes.

Figure H-22 illustrates the format of the STATES class record. Table H-22 describes the fields in the data block for the STATES class record.

Figure H-22 STATES Class Record Format

Table H-22 Descriptions of STATES Class Record Fields
Field Symbolic Offset Contents

Collided
Page Wait MNR_STA$L_COLPG Number of processes in collided page wait (longword,L)

Misc
Resource Wait MNR_STA$L_MWAIT Number of processes in miscellaneous resource wait (longword,L)

Common Event
Flag Wait MNR_STA$L_CEF Number of processes in common event flag wait (longword,L)

Page Fault
Wait MNR_STA$L_PFW Number of processes in page fault wait (longword,L)

Local Event Flag,
Inswapped MNR_STA$L_LEF Number of processes in local event flag wait, inswapped (longword,L)

Local Event Flag,
Outswapped MNR_STA$L_LEFO Number of processes in local event flag wait, outswapped (longword,L)

Hibernate,
Inswapped MNR_STA$L_HIB Number of processes in hibernate wait, inswapped (longword,L)

Hibernate,
Outswapped MNR_STA$L_HIBO Number of processes in hibernate wait, outswapped (longword,L)

Suspended,
Inswapped MNR_STA$L_SUSP Number of processes in suspended wait, inswapped (longword,L)

Suspended,
Outswapped MNR_STA$L_SUSPO Number of processes in suspended wait, outswapped (longword,L)

Free Page
Wait MNR_STA$L_FPG Number of processes in free wait (longword,L)

Compute State,
Inswapped MNR_STA$L_COM Number of processes in compute state, inswapped (longword,L)

Compute State,
Outswapped MNR_STA$L_COMO Number of processes in compute state, outswapped (longword,L)

Current MNR_STA$L_CUR Number of current processes (longword,L)

**Table H-22 Descriptions of STATES Class Record Fields**
Field	Symbolic Offset	Contents
Collided Page Wait	MNR_STA$L_COLPG	Number of processes in collided page wait (longword,L)
Misc Resource Wait	MNR_STA$L_MWAIT	Number of processes in miscellaneous resource wait (longword,L)
Common Event Flag Wait	MNR_STA$L_CEF	Number of processes in common event flag wait (longword,L)
Page Fault Wait	MNR_STA$L_PFW	Number of processes in page fault wait (longword,L)
Local Event Flag, Inswapped	MNR_STA$L_LEF	Number of processes in local event flag wait, inswapped (longword,L)
Local Event Flag, Outswapped	MNR_STA$L_LEFO	Number of processes in local event flag wait, outswapped (longword,L)
Hibernate, Inswapped	MNR_STA$L_HIB	Number of processes in hibernate wait, inswapped (longword,L)
Hibernate, Outswapped	MNR_STA$L_HIBO	Number of processes in hibernate wait, outswapped (longword,L)
Suspended, Inswapped	MNR_STA$L_SUSP	Number of processes in suspended wait, inswapped (longword,L)
Suspended, Outswapped	MNR_STA$L_SUSPO	Number of processes in suspended wait, outswapped (longword,L)
Free Page Wait	MNR_STA$L_FPG	Number of processes in free wait (longword,L)
Compute State, Inswapped	MNR_STA$L_COM	Number of processes in compute state, inswapped (longword,L)
Compute State, Outswapped	MNR_STA$L_COMO	Number of processes in compute state, outswapped (longword,L)
Current	MNR_STA$L_CUR	Number of current processes (longword,L)

H.4.2.16 SYSTEM Class Record

The SYSTEM class record contains data describing the overall operation of the three major system components (CPU, memory, I/O). The SYSTEM class record has a record type of 17 and a size of 49 bytes. Note that when the SYSTEM class is recorded, the PROCESSES, STATES, and MODES classes are also recorded, even if not explicitly requested.

Figure H-23 illustrates the format of the SYSTEM class record. Table H-23 describes the fields in the data block for the SYSTEM class record.

Figure H-23 SYSTEM Class Record Format

Table H-23 Descriptions of SYSTEM Class Record Fields
Field Symbolic Offset Contents

CPU Busy MNR_SYS$L_BUSY Count of clock ticks (10-millisecond units) spent in all CPU modes since system was booted (longword,C)

Other States MNR_SYS$L_OTHSTAT Number of processes in states other than LEF, LEFO, HIB, HIBO, COM, COMO, PFW, and MWAIT (longword,L)

Process Count MNR_SYS$L_PROCS Number of processes in system (longword,L)

Page Faults MNR_SYS$L_FAULTS Count of page faults for all working sets (longword,C)

Read I/Os MNR_SYS$L_PREADIO Count of read I/Os resulting from disk page faults (longword,C)

Free Page Count MNR_SYS$L_FREECNT Number of pages currently on free-page list (longword,L)

Modified Page Count MNR_SYS$L_MFYCNT Number of pages currently on modified-page list (longword,L)

Direct I/Os MNR_SYS$L_DIRIO Count of direct I/O operations (longword,C)

Buffered I/Os MNR_SYS$L_BUFIO Count of buffered I/O operations (longword,C)

**Table H-23 Descriptions of SYSTEM Class Record Fields**
Field	Symbolic Offset	Contents
CPU Busy	MNR_SYS$L_BUSY	Count of clock ticks (10-millisecond units) spent in all CPU modes since system was booted (longword,C)
Other States	MNR_SYS$L_OTHSTAT	Number of processes in states other than LEF, LEFO, HIB, HIBO, COM, COMO, PFW, and MWAIT (longword,L)
Process Count	MNR_SYS$L_PROCS	Number of processes in system (longword,L)
Page Faults	MNR_SYS$L_FAULTS	Count of page faults for all working sets (longword,C)
Read I/Os	MNR_SYS$L_PREADIO	Count of read I/Os resulting from disk page faults (longword,C)
Free Page Count	MNR_SYS$L_FREECNT	Number of pages currently on free-page list (longword,L)
Modified Page Count	MNR_SYS$L_MFYCNT	Number of pages currently on modified-page list (longword,L)
Direct I/Os	MNR_SYS$L_DIRIO	Count of direct I/O operations (longword,C)
Buffered I/Os	MNR_SYS$L_BUFIO	Count of buffered I/O operations (longword,C)

H.4.2.17 TRANSACTION Class Record

The TRANSACTION class record contains data describing the operations of the DECdtm transaction manager. The TRANSACTION class has a record type of 22 and a size of 69 bytes. Figure H-24 illustrates the format of the TRANSACTION class record. Table H-24 describes the contents of each of its fields.

Figure H-24 TRANSACTION Class Record Format

Table H-24 Descriptions of TRANSACTION Class Record Fields
Field Symbolic Offset Contents

Starts MNR_TRA$L_STARTS Count of transactions started. The number of times that calls on the local node to $START_TRANS have completed successfully (longword, C).

Prepares MNR_TRA$L_PREPARES Count of transactions that have been prepared (longword, C).

One Phase Commits MNR_TRA$L_ONE_PHASE Count of one-phase commit events initiated (longword, C).

Commits MNR_TRA$L_COMMITS Count of transactions committed. This is the combined total of one-phase and two-phase commits (longword, C).

Aborts MNR_TRA$L_ABORTS Count of transactions aborted. Combined total of planned and unplanned aborts (longword, C).

Ends MNR_TRA$L_ENDS Count of transactions ended. The number of times that calls on the local node to $END_TRANS have completed successfully (longword, C).

Branches MNR_TRA$L_BRANCHS Count of transaction branches started on the local node (longword, C).

Adds MNR_TRA$L_ADDS Count of transaction branches added on the local node (longword, C).

0-1 Transactions MNR_TRA$L_BUCKETS1 Count of transactions with a duration of less than 1 second (longword, C).

1-2 Transactions MNR_TRA$L_BUCKETS2 Count of transactions with a duration of 1 to 2 (1.99) seconds (longword, C).

2-3 Transactions MNR_TRA$L_BUCKETS3 Count of transactions with a duration of 2 to 3 seconds (longword, C).

3-4 Transactions MNR_TRA$L_BUCKETS4 Count of transactions with a duration of 3 to 4 seconds (longword, C).

4-5 Transactions MNR_TRA$L_BUCKETS5 Count of transactions with a duration of 4 to 5 seconds (longword, C).

5+ Transactions MNR_TRA$L_BUCKETS6 Count of transactions with a duration greater than 5 seconds (longword, C).

**Table H-24 Descriptions of TRANSACTION Class Record Fields**
Field	Symbolic Offset	Contents
Starts	MNR_TRA$L_STARTS	Count of transactions started. The number of times that calls on the local node to $START_TRANS have completed successfully (longword, C).
Prepares	MNR_TRA$L_PREPARES	Count of transactions that have been prepared (longword, C).
One Phase Commits	MNR_TRA$L_ONE_PHASE	Count of one-phase commit events initiated (longword, C).
Commits	MNR_TRA$L_COMMITS	Count of transactions committed. This is the combined total of one-phase and two-phase commits (longword, C).
Aborts	MNR_TRA$L_ABORTS	Count of transactions aborted. Combined total of planned and unplanned aborts (longword, C).
Ends	MNR_TRA$L_ENDS	Count of transactions ended. The number of times that calls on the local node to $END_TRANS have completed successfully (longword, C).
Branches	MNR_TRA$L_BRANCHS	Count of transaction branches started on the local node (longword, C).
Adds	MNR_TRA$L_ADDS	Count of transaction branches added on the local node (longword, C).
0-1 Transactions	MNR_TRA$L_BUCKETS1	Count of transactions with a duration of less than 1 second (longword, C).
1-2 Transactions	MNR_TRA$L_BUCKETS2	Count of transactions with a duration of 1 to 2 (1.99) seconds (longword, C).
2-3 Transactions	MNR_TRA$L_BUCKETS3	Count of transactions with a duration of 2 to 3 seconds (longword, C).
3-4 Transactions	MNR_TRA$L_BUCKETS4	Count of transactions with a duration of 3 to 4 seconds (longword, C).
4-5 Transactions	MNR_TRA$L_BUCKETS5	Count of transactions with a duration of 4 to 5 seconds (longword, C).
5+ Transactions	MNR_TRA$L_BUCKETS6	Count of transactions with a duration greater than 5 seconds (longword, C).

H.4.2.18 VBS Class Record (VAX Only)

On VAX systems, the VBS class record contains statistics on the operation of the virtual balance slot (VBS) mechanism. The VBS class record has a record type of 24 and a size of 21 bytes.

Figure H-25 illustrates the format of a VBS class record. Table H-25 describes the fields in the data block for the VBS class record.

Figure H-25 VBS Class Record Format (VAX Only)

Table H-25 Descriptions of VBS Class Record Fields (VAX Only)
Field Symbolic Offset Contents

VBS Faults MNR_VBS$L_VRBS_TRAN Count of faults from virtual balance slots to real balance slots (longword, C)

VBS Clock Ticks MNR_VBS$L_VCPUTICKS Count of virtual balance slot clock ticks (10-millisecond units) (longword, C)

**Table H-25 Descriptions of VBS Class Record Fields (VAX Only)**
Field	Symbolic Offset	Contents
VBS Faults	MNR_VBS$L_VRBS_TRAN	Count of faults from virtual balance slots to real balance slots (longword, C)
VBS Clock Ticks	MNR_VBS$L_VCPUTICKS	Count of virtual balance slot clock ticks (10-millisecond units) (longword, C)

H.4.2.19 VECTOR Class Record

The VECTOR class record contains data describing the time during which vector consumers have been scheduled on a vector-present processor. Its record type number is 23. A VECTOR class record is of variable length and depends on the number of active processors in the system. Assuming all processors are active, MONITOR calculates the size of the record by adding the size of the class header, the class prefix, and the data blocks contained in the record. This is shown in the following formula:

13 + 8 + (5 * MNR_SYI$B_VPCPUS)

Figure H-26 illustrates the format of the VECTOR class record. Table H-26 describes the contents of each of its fields.

Figure H-26 VECTOR Class Record Format

Table H-26 Descriptions of VECTOR Class Record Fields
Field Symbolic Offset Contents

CPU ID MNR_VEC$B_CPUID Identification of the processor from which the data has been collected (byte, I)

Ticks MNR_VEC$L_TICKS Number of 10-millisecond clock ticks in which a vector consumer has been scheduled on this processor (longword, C)

**Table H-26 Descriptions of VECTOR Class Record Fields**
Field	Symbolic Offset	Contents
CPU ID	MNR_VEC$B_CPUID	Identification of the processor from which the data has been collected (byte, I)
Ticks	MNR_VEC$L_TICKS	Number of 10-millisecond clock ticks in which a vector consumer has been scheduled on this processor (longword, C)

To support the VECTOR class, MONITOR uses the items MNR_SYI$B_VPCPUS and MNR_SYI$L_VPCONF in the system information record. See Table H-3 for details on these items.

Appendix I
SHOW CLUSTER Keypad Commands

SHOW CLUSTER provides a predefined keypad that you can use to enter selected commands. You can add, remove, or reposition windows, scroll their contents, or change the interval at which the display is updated. You can also customize the keypad by redefining the default functions of individual keys.

I.1 Using the Keypad

By default, the numeric keypad is defined as shown in Figure I-1.

Figure I-1 SHOW CLUSTER Default Keypad

Shading over a keypad command indicates that you must press the GOLD key and then the keypad key.

Table I-1 describes each of the keypad commands you can use with the Show Cluster utility. In this table, KPn refers to the keypad key labeled with the number n. For example, KP2 refers to the keypad key labeled with the number 2. All commands shown on the keypad are also discussed in the Command Section of Chapter 18.

Table I-1 SHOW CLUSTER Keypad Commands
Command Key or
Key Sequence Description

ADD KP4 Modifies the current display by including the field or class that you specify after the ADD command.

DESELECT GOLD-Period Terminates a window selection.

GOLD PF1 When pressed before another keypad key, specifies the second key's alternate function (the bottom function on the keypad diagram).

HELP PF2 Displays information about using the editing keypad.

INIT PF4 Resets the display using the original default values for field names, class names, and field widths.

REFRESH PF3 Refreshes the screen display. Clears and redraws the screen, deleting any extraneous characters or messages that might have appeared on the screen but are not part of the SHOW CLUSTER display. (Performs the same function as Ctrl/W.)

REMOVE KP5 Modifies the current display by removing the field or class that you specify after the REMOVE command.

SAVE KP2 Allows you to save the current display to a startup initialization file or a command procedure that you can then use to restore the display at a later time.

SELECT Period Designates which window to scroll or move.

SET KP1 Changes any of several options including the number of columns in the display, the number of seconds between updates, the functions of the arrow keys, the auto positioning of windows, and the characteristics of a particular field.

SET AUTO_POS OFF KP6 Disables the automatic positioning of windows on the screen.

SET AUTO_POS ON GOLD-KP6 Enables the Show Cluster utility to automatically position windows on the screen. This is the default setting.

SET FUNCTION
EDIT Hyphen Redefines the arrow keys to restore line-mode editing.

SET FUNCTION
MOVE KP9 Redefines the arrow keys to move a selected window to a specified position on the display screen. For example, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as MOVE UP 1, MOVE DOWN 1, MOVE RIGHT 1, and MOVE LEFT 1, respectively.

SET FUNCTION
PAN KP7 Redefines the arrow keys to rotate the display. For example, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as PAN UP 1, PAN DOWN 1, PAN RIGHT 1, and PAN LEFT 1, respectively.

SET FUNCTION
SCROLL KP8 Resets the arrow keys to scroll the screen display. For example, if you press the SET FUNCTION SCROLL key, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as SCROLL UP 1, SCROLL DOWN 1, SCROLL RIGHT 1, and SCROLL LEFT 1, respectively.

WRITE KP3 Outputs the current display to either a file name that you specify, or to the default output file name SHOW_CLUSTER.LIS.

**Table I-1 SHOW CLUSTER Keypad Commands**
Command	Key or Key Sequence	Description
ADD	KP4	Modifies the current display by including the field or class that you specify after the ADD command.
DESELECT	GOLD-Period	Terminates a window selection.
GOLD	PF1	When pressed before another keypad key, specifies the second key's alternate function (the bottom function on the keypad diagram).
HELP	PF2	Displays information about using the editing keypad.
INIT	PF4	Resets the display using the original default values for field names, class names, and field widths.
REFRESH	PF3	Refreshes the screen display. Clears and redraws the screen, deleting any extraneous characters or messages that might have appeared on the screen but are not part of the SHOW CLUSTER display. (Performs the same function as Ctrl/W.)
REMOVE	KP5	Modifies the current display by removing the field or class that you specify after the REMOVE command.
SAVE	KP2	Allows you to save the current display to a startup initialization file or a command procedure that you can then use to restore the display at a later time.
SELECT	Period	Designates which window to scroll or move.
SET	KP1	Changes any of several options including the number of columns in the display, the number of seconds between updates, the functions of the arrow keys, the auto positioning of windows, and the characteristics of a particular field.
SET AUTO_POS OFF	KP6	Disables the automatic positioning of windows on the screen.
SET AUTO_POS ON	GOLD-KP6	Enables the Show Cluster utility to automatically position windows on the screen. This is the default setting.
SET FUNCTION EDIT	Hyphen	Redefines the arrow keys to restore line-mode editing.
SET FUNCTION MOVE	KP9	Redefines the arrow keys to move a selected window to a specified position on the display screen. For example, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as MOVE UP 1, MOVE DOWN 1, MOVE RIGHT 1, and MOVE LEFT 1, respectively.
SET FUNCTION PAN	KP7	Redefines the arrow keys to rotate the display. For example, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as PAN UP 1, PAN DOWN 1, PAN RIGHT 1, and PAN LEFT 1, respectively.
SET FUNCTION SCROLL	KP8	Resets the arrow keys to scroll the screen display. For example, if you press the SET FUNCTION SCROLL key, the UP, DOWN, RIGHT, and LEFT arrow keys are redefined as SCROLL UP 1, SCROLL DOWN 1, SCROLL RIGHT 1, and SCROLL LEFT 1, respectively.
WRITE	KP3	Outputs the current display to either a file name that you specify, or to the default output file name SHOW_CLUSTER.LIS.

I.2 Redefining the Keypad Keys

Use the DEFINE/KEY command to change the definition of a key. See the DEFINE/KEY command in the Command Section of Chapter 18 for more information.

I.3 Redefining the Arrow Keys

By default, the SHOW CLUSTER arrow keys are set to the EDIT function. This means that you can perform command line editing at the command prompt that is similar to DCL line-mode editing. For example, the left arrow key moves the cursor to the left, or the up arrow key recalls the previous command. See the OpenVMS User's Manual for information on DCL line-mode editing.

The SET FUNCTION keys, shown in the second row of the keypad, redefine the arrow keys to perform a specified function. You can reset the arrow keys from EDIT to PAN, SCROLL, or MOVE with the SET FUNCTION command. For example, if you press the SET FUNCTION SCROLL key, the up, down, right, and left arrow keys are redefined as SCROLL UP 1, SCROLL DOWN 1, SCROLL RIGHT 1, and SCROLL LEFT 1, respectively. (See the Command Section of Chapter 18 for information on specific commands.)

Note
If you set the function to PAN, SCROLL, or MOVE, the arrow keys are no longer defined to perform DCL line-mode editing. Only one function can be enabled at a time. To restore line-mode editing once it has been changed to another function, enter the command SET FUNCTION EDIT.

Appendix J
System Parameters

This appendix describes OpenVMS system parameters.

Note
Digital recommends that you use AUTOGEN to modify system parameters. In special cases, however, you can use a conversational boot to modify a parameter value temporarily. To change a parameter value permanently, you must edit MODPARAMS.DAT and run AUTOGEN. For instructions, see the OpenVMS System Manager's Manual.

J.1 How the Parameters Are Described

System parameters can be grouped into categories, as shown in Section J.1.1. In addition, each parameter can have one or more attributes, listed in Section J.1.1. Each parameter also has a value.

The parameters in this appendix are listed alphabetically along with their attributes.

J.1.1 Parameter Categories and Attributes

The system parameters can be divided into the following categories (see also Table J-1):

Category Description

ACP Parameters associated with file system caches and Files-11 ancillary control processes (ACPs)

CLUSTER Parameters that affect OpenVMS Cluster operation

JOB Job control parameters

LGI Login security parameters

PQL Parameters associated with process creation limits and quotas

RMS Parameters associated with OpenVMS RMS

SCS Parameters that control System Communications Services (SCS) and port driver operation. The parameters that affect SCS operation have the prefix SCS. The parameters that affect the CI780/CI750 port driver have the prefix PA.

SPECIAL Special parameters used by Digital. These parameters should only be changed if recommended by Digital personnel, or if they are clearly stated to change in the installation guide or release notes of a Digital-supplied layered product. Section J.2.2 describes the special parameters.

SYS Parameters that affect overall system operation

TTY Parameters associated with terminal behavior

Category	Description
ACP	Parameters associated with file system caches and Files-11 ancillary control processes (ACPs)
CLUSTER	Parameters that affect OpenVMS Cluster operation
JOB	Job control parameters
LGI	Login security parameters
PQL	Parameters associated with process creation limits and quotas
RMS	Parameters associated with OpenVMS RMS
SCS	Parameters that control System Communications Services (SCS) and port driver operation. The parameters that affect SCS operation have the prefix SCS. The parameters that affect the CI780/CI750 port driver have the prefix PA.
SPECIAL	Special parameters used by Digital. These parameters should only be changed if recommended by Digital personnel, or if they are clearly stated to change in the installation guide or release notes of a Digital-supplied layered product. Section J.2.2 describes the special parameters.
SYS	Parameters that affect overall system operation
TTY	Parameters associated with terminal behavior

The user can also define four parameters: USERD1, USERD2, USER3, and USER4. USERD1 and USERD2 are dynamic.

Attributes for Parameters

Parameters can have one or more of the following attributes:

Attribute Description

AUTOGEN AUTOGEN calculates and modifies values

DYNAMIC Active values can be modified

FEEDBACK FEEDBACK information available for AUTOGEN calculations

GEN Affects the creation and initialization of data structures at bootstrap time

MAJOR Most likely to require modification

These attributes are noted in the detailed parameter descriptions in Section J.2.

Attribute	Description
AUTOGEN	AUTOGEN calculates and modifies values
DYNAMIC	Active values can be modified
FEEDBACK	FEEDBACK information available for AUTOGEN calculations
GEN	Affects the creation and initialization of data structures at bootstrap time
MAJOR	Most likely to require modification

Table J-1 lists system parameters according to category. Footnotes indicate dynamic and system-specific parameters.

Table J-1 System Parameters
ACP Parameters

ACP_BASEPRIO¹ ACP_DATACHECK¹ ACP_DINDXCACHE¹

ACP_DIRCACHE¹ ACP_EXTCACHE¹ ACP_EXTLIMIT¹

ACP_FIDCACHE¹ ACP_HDRCACHE¹ ACP_MAPCACHE¹

ACP_MAXREAD¹ ACP_MULTIPLE¹ ACP_QUOCACHE¹

ACP_REBLDSYSD ACP_SHARE¹ ACP_SWAPFLGS¹

ACP_SYSACC¹ ACP_WINDOW¹ ACP_WORKSET¹

ACP_WRITEBACK¹ ACP_XQP_RES¹

CLUSTER Parameters

ALLOCLASS +CHECK_CLUSTER CLUSTER_CREDITS

DISK_QUORUM¹ DR_UNIT_BASE EXPECTED_VOTES

LOCKDIRWT MSCP_BUFFER MSCP_CMD_TMO

MSCP_CREDITS MSCP_LOAD MSCP_SERVE_ALL

NISCS_CONV_BOOT NISCS_LOAD_PEA0 NISCS_PORT_SERV

QDSKINTERVAL QDSKSVOTES RECNXINTERVAL¹

TAPE_ALLOCLASS TMSCP_LOAD TMSCP_SERVE_ALL

VAXCLUSTER VOTES

JOB Parameters

DEFPRI¹ DEFQUEPRI¹ IJOBLIM¹

MAXQUEPRI¹ NJOBLIM¹ RJOBLIM¹

LGI Parameters

LGI_BRK_DISUSER¹ LGI_BRK_LIM¹ LGI_BRK_TERM¹

LGI_BRK_TMO¹ LGI_CALLOUTS¹ LGI_HID_TIM¹

LGI_PWD_TMO¹ LGI_RETRY_LIM¹ LGI_RETRY_TMO¹

MULTIPROCESSING Parameters

++IO_PREFER_CPUS MULTIPROCESSING SMP_CPUS

SMP_LNGSPINWAIT SMP_SANITY_CNT SMP_SPINWAIT

PQL Parameters

PQL_DASTLM¹ PQL_DBIOLM¹ PQL_DBYTLM¹

PQL_DCPULM¹ PQL_DDIOLM¹ PQL_DENQLM¹

PQL_DFILLM¹ PQL_DJTQUOTA PQL_DPGFLQUOTA¹

PQL_DPRCLM¹ PQL_DTQELM¹ PQL_DWSDEFAULT

PQL_DWSEXTENT¹ PQL_DWSQUOTA¹ PQL_MASTLM¹

PQL_MBIOLM¹ PQL_MBYTLM¹ PQL_MCPULM¹

PQL_MDIOLM¹ PQL_MENQLM¹ PQL_MFILLM¹

PQL_MJTQUOTA PQL_MPGFLQUOTA¹ PQL_MPRCLM¹

PQL_MTQELM¹ PQL_MWSDEFAULT PQL_MWSEXTENT¹

PQL_MWSQUOTA¹

RMS Parameters

RMS_DFMBC¹ RMS_DFMBFIDX¹ RMS_DFMBFREL¹

RMS_DFMBFSDK¹ RMS_DFMBFSMT¹ RMS_DFMBFSUR¹

RMS_DFNBC¹ RMS_EXTEND_SIZE¹ RMS_FILEPROT

RMS_PROLOGUE¹

SCS Parameters

PAMAXPORT¹ PANOPOLL¹ PANUMPOLL¹

PAPOLLINTERVAL¹ PAPOOLINTERVAL¹ PASANITY¹

PASTDGBUF PASTIMOUT¹ PRCPOLINTERVAL¹

SCSBUFFCNT SCSCONNCNT SCSFLOWCUSH¹

SCSMAXDG SCSMAXMSG SCSNODE

SCSRESPCNT SCSSYSTEMID SCSSYSTEMIDH

TIMVCFAIL¹ UDABURSTRATE

Special Parameters

AFFINITY_SKIP AFFINITY_TIME BREAKPOINTS

CHANNELCNT +CLOCK_INTERVAL CONCEAL_DEVICES

+CRD_CONTROL CTLIMGLIM CTLPAGES

DISABLE_UPCALLS¹ +DLCKEXTRASTK DNVOSI1

EXUSRSTK ++FAST_PATH IMGIOCNT

IOTA JOBCTLD LOAD_SYS_IMAGES

LOCKRETRY MAXCLASSPRI¹ MINCLASSPRI¹

MPW_PRIO NOAUTOCONFIG¹ +NOCLUSTER

NOPGFLSWP PAGTBLPFC PE

++PFN_COLOR_COUNT ++PHYSICAL_MEMORY +PHYSICALPAGES

PIOPAGES¹ PIXSCAN¹ POOLCHECK¹

POOLPAGING PRIORITY_OFFSET +PSEUDOLOA

PU_OPTIONS +QBUS_MULT_INTR RESALLOC

RSRVPAGCNT S0_PAGING SA_APP

+SBIERRENABLE +SCH_CTLFLAGS¹ +SCSI_NOAUTO¹

++SCSICLUSTER_P[1-4] SMP_CPUSH SMP_TICK_CNT

SSINHIBIT SWPALLOCINC SWPFAIL

SWPRATE SWP_PRIO SYSPFC

TBSKIPWSL TIME_CONTROL¹ USERD1¹

USERD2¹ USER3 USER4

+VBN_CACHE_S +VBSS_ENABLE +VBSS_ENABLE2

++VCC_FLAGS ++VCC_MAXSIZE +VCC_PTES

VMS¹ WPRE_SIZE¹ WPTTE_SIZE¹

WRITABLESYS WRITESYSPARAMS¹ XQPCTL2

XQPCTLD1

SYS Parameters

AWSMIN¹ AWSTIME¹ BALSETCNT

BORROWLIM¹ BUGCHECKFATAL¹ BUGREBOOT¹

CLASS_PROT¹ CLISYMTBL¹ CRDENABLE

CWCREPRC_ENABLE ++DBGTK_SCRATCH DEADLOCK_WAIT¹

DEFMBXBUFQUO¹ DEFMBXMXMSG¹ ++DEVICE_NAMING

DORMANTWAIT¹ DUMPBUG DUMPSTYLE¹

ERLBUFFERPAGES ERRORLOGBUFFERS EXTRACPU¹

FREEGOAL¹ FREELIM GBLPAGES¹

GBLPAGFIL¹ GBLSECTIONS ++GH_EXEC_CODE

++GH_EXEC_DATA ++GH_RES_CODE ++GH_RES_DATA

++GH_RSRVPGCNT GROWLIM¹ ++IMGREG_PAGES

+INTSTKPAGES¹ ++KSTACKPAGES +LAMAPREGS

++LAN_FLAGS¹ LNMPHASHTBL LNMSHASHTBL

LOAD_PWD_POLICY LOCKIDTBL LONGWAIT¹

++MAXBOBMEM MAXBUF¹ MAXPROCESSCNT

MAXSYSGROUP¹ MC_SERVICES_P0 MC_SERVICES_P1¹

MC_SERVICES_P3 MC_SERVICES_P4 MC_SERVICES_P5¹

MC_SERVICES_P6 MC_SERVICES_P7¹ MC_SERVICES_P8

MC_SERVICES_P9 MINWSCNT MMG_CTLFLAGS¹

MPW_HILIMIT MPW_IOLIMIT MPW_LOLIMIT

MPW_LOWAITLIMIT¹ MPW_THRESH¹ MPW_WAITLIMIT¹

MPW_WRTCLUSTER ++MULTITHREAD MVTIMEOUT¹

NET_CALLOUTS¹ NISCS_LAN_OVRHD NISCS_MAX_PKTSZ

NPAGEDYN NPAGEVIR NPAG_AGGRESSIVE¹

NPAG_BAP_MAX NPAG_BAP_MAX_PA NPAG_BAP_MIN

NPAG_GENTLE¹ NPAG_INTERVAL¹ NPAG_RING_SIZE

PAGEDYN PAGFILCNT PFCDEFAULT¹

PFRATH¹ PFRATL¹ PROCSECTCNT

QUANTUM¹ +REALTIME_SPTS¹ RESHASHTBL

++S2_SIZE SAVEDUMP SECURITY_POLICY

SETTIME SHADOWING SHADOW_MAX_COPY¹

SHADOW_MBR_TMO¹ SHADOW_SYS_DISK SHADOW_SYS_TMO

SHADOW_SYS_UNIT SHADOW_SYS_WAIT +SPTREQ

STARTUP_P1-8 SWPFILCNT SWPOUTPGCNT¹

SYSMWCNT SYSTEM_CHECK TAILORED

TAPE_MVTIMEOUT¹ TIMEPROMPTWAIT UAFALTERNATE

+VECTOR_MARGIN¹ +VECTOR_PROC VIRTUALPAGECNT

WINDOW_SYSTEM¹ WSDEC¹ WSINC¹

WSMAX WS_OPA0 XFMAXRATE¹

++ZERO_LIST_HI¹

TTY Parameters

TTY_ALTALARM TTY_ALTYPAHD TTY_AUTOCHAR¹

TTY_BUF TTY_CLASSNAME TTY_DEFCHAR

TTY_DEFCHAR2 TTY_DEFPORT TTY_DIALTYPE

TTY_DMASIZE¹ TTY_PARITY TTY_RSPEED

TTY_SCANDELTA TTY_SILOTIME TTY_SPEED

TTY_TIMEOUT¹ TTY_TYPAHDSZ

**Table J-1 System Parameters**
ACP Parameters
ACP_BASEPRIO¹	ACP_DATACHECK¹	ACP_DINDXCACHE¹
ACP_DIRCACHE¹	ACP_EXTCACHE¹	ACP_EXTLIMIT¹
ACP_FIDCACHE¹	ACP_HDRCACHE¹	ACP_MAPCACHE¹
ACP_MAXREAD¹	ACP_MULTIPLE¹	ACP_QUOCACHE¹
ACP_REBLDSYSD	ACP_SHARE¹	ACP_SWAPFLGS¹
ACP_SYSACC¹	ACP_WINDOW¹	ACP_WORKSET¹
ACP_WRITEBACK¹	ACP_XQP_RES¹
CLUSTER Parameters
ALLOCLASS	+CHECK_CLUSTER	CLUSTER_CREDITS
DISK_QUORUM¹	DR_UNIT_BASE	EXPECTED_VOTES
LOCKDIRWT	MSCP_BUFFER	MSCP_CMD_TMO
MSCP_CREDITS	MSCP_LOAD	MSCP_SERVE_ALL
NISCS_CONV_BOOT	NISCS_LOAD_PEA0	NISCS_PORT_SERV
QDSKINTERVAL	QDSKSVOTES	RECNXINTERVAL¹
TAPE_ALLOCLASS	TMSCP_LOAD	TMSCP_SERVE_ALL
VAXCLUSTER	VOTES
JOB Parameters
DEFPRI¹	DEFQUEPRI¹	IJOBLIM¹
MAXQUEPRI¹	NJOBLIM¹	RJOBLIM¹
LGI Parameters
LGI_BRK_DISUSER¹	LGI_BRK_LIM¹	LGI_BRK_TERM¹
LGI_BRK_TMO¹	LGI_CALLOUTS¹	LGI_HID_TIM¹
LGI_PWD_TMO¹	LGI_RETRY_LIM¹	LGI_RETRY_TMO¹
MULTIPROCESSING Parameters
++IO_PREFER_CPUS	MULTIPROCESSING	SMP_CPUS
SMP_LNGSPINWAIT	SMP_SANITY_CNT	SMP_SPINWAIT
PQL Parameters
PQL_DASTLM¹	PQL_DBIOLM¹	PQL_DBYTLM¹
PQL_DCPULM¹	PQL_DDIOLM¹	PQL_DENQLM¹
PQL_DFILLM¹	PQL_DJTQUOTA	PQL_DPGFLQUOTA¹
PQL_DPRCLM¹	PQL_DTQELM¹	PQL_DWSDEFAULT
PQL_DWSEXTENT¹	PQL_DWSQUOTA¹	PQL_MASTLM¹
PQL_MBIOLM¹	PQL_MBYTLM¹	PQL_MCPULM¹
PQL_MDIOLM¹	PQL_MENQLM¹	PQL_MFILLM¹
PQL_MJTQUOTA	PQL_MPGFLQUOTA¹	PQL_MPRCLM¹
PQL_MTQELM¹	PQL_MWSDEFAULT	PQL_MWSEXTENT¹
PQL_MWSQUOTA¹
RMS Parameters
RMS_DFMBC¹	RMS_DFMBFIDX¹	RMS_DFMBFREL¹
RMS_DFMBFSDK¹	RMS_DFMBFSMT¹	RMS_DFMBFSUR¹
RMS_DFNBC¹	RMS_EXTEND_SIZE¹	RMS_FILEPROT
RMS_PROLOGUE¹
SCS Parameters
PAMAXPORT¹	PANOPOLL¹	PANUMPOLL¹
PAPOLLINTERVAL¹	PAPOOLINTERVAL¹	PASANITY¹
PASTDGBUF	PASTIMOUT¹	PRCPOLINTERVAL¹
SCSBUFFCNT	SCSCONNCNT	SCSFLOWCUSH¹
SCSMAXDG	SCSMAXMSG	SCSNODE
SCSRESPCNT	SCSSYSTEMID	SCSSYSTEMIDH
TIMVCFAIL¹	UDABURSTRATE
Special Parameters
AFFINITY_SKIP	AFFINITY_TIME	BREAKPOINTS
CHANNELCNT	+CLOCK_INTERVAL	CONCEAL_DEVICES
+CRD_CONTROL	CTLIMGLIM	CTLPAGES
DISABLE_UPCALLS¹	+DLCKEXTRASTK	DNVOSI1
EXUSRSTK	++FAST_PATH	IMGIOCNT
IOTA	JOBCTLD	LOAD_SYS_IMAGES
LOCKRETRY	MAXCLASSPRI¹	MINCLASSPRI¹
MPW_PRIO	NOAUTOCONFIG¹	+NOCLUSTER
NOPGFLSWP	PAGTBLPFC	PE
++PFN_COLOR_COUNT	++PHYSICAL_MEMORY	+PHYSICALPAGES
PIOPAGES¹	PIXSCAN¹	POOLCHECK¹
POOLPAGING	PRIORITY_OFFSET	+PSEUDOLOA
PU_OPTIONS	+QBUS_MULT_INTR	RESALLOC
RSRVPAGCNT	S0_PAGING	SA_APP
+SBIERRENABLE	+SCH_CTLFLAGS¹	+SCSI_NOAUTO¹
++SCSICLUSTER_P[1-4]	SMP_CPUSH	SMP_TICK_CNT
SSINHIBIT	SWPALLOCINC	SWPFAIL
SWPRATE	SWP_PRIO	SYSPFC
TBSKIPWSL	TIME_CONTROL¹	USERD1¹
USERD2¹	USER3	USER4
+VBN_CACHE_S	+VBSS_ENABLE	+VBSS_ENABLE2
++VCC_FLAGS	++VCC_MAXSIZE	+VCC_PTES
VMS¹	WPRE_SIZE¹	WPTTE_SIZE¹
WRITABLESYS	WRITESYSPARAMS¹	XQPCTL2
XQPCTLD1
SYS Parameters
AWSMIN¹	AWSTIME¹	BALSETCNT
BORROWLIM¹	BUGCHECKFATAL¹	BUGREBOOT¹
CLASS_PROT¹	CLISYMTBL¹	CRDENABLE
CWCREPRC_ENABLE	++DBGTK_SCRATCH	DEADLOCK_WAIT¹
DEFMBXBUFQUO¹	DEFMBXMXMSG¹	++DEVICE_NAMING
DORMANTWAIT¹	DUMPBUG	DUMPSTYLE¹
ERLBUFFERPAGES	ERRORLOGBUFFERS	EXTRACPU¹
FREEGOAL¹	FREELIM	GBLPAGES¹
GBLPAGFIL¹	GBLSECTIONS	++GH_EXEC_CODE
++GH_EXEC_DATA	++GH_RES_CODE	++GH_RES_DATA
++GH_RSRVPGCNT	GROWLIM¹	++IMGREG_PAGES
+INTSTKPAGES¹	++KSTACKPAGES	+LAMAPREGS
++LAN_FLAGS¹	LNMPHASHTBL	LNMSHASHTBL
LOAD_PWD_POLICY	LOCKIDTBL	LONGWAIT¹
++MAXBOBMEM	MAXBUF¹	MAXPROCESSCNT
MAXSYSGROUP¹	MC_SERVICES_P0	MC_SERVICES_P1¹
MC_SERVICES_P3	MC_SERVICES_P4	MC_SERVICES_P5¹
MC_SERVICES_P6	MC_SERVICES_P7¹	MC_SERVICES_P8
MC_SERVICES_P9	MINWSCNT	MMG_CTLFLAGS¹
MPW_HILIMIT	MPW_IOLIMIT	MPW_LOLIMIT
MPW_LOWAITLIMIT¹	MPW_THRESH¹	MPW_WAITLIMIT¹
MPW_WRTCLUSTER	++MULTITHREAD	MVTIMEOUT¹
NET_CALLOUTS¹	NISCS_LAN_OVRHD	NISCS_MAX_PKTSZ
NPAGEDYN	NPAGEVIR	NPAG_AGGRESSIVE¹
NPAG_BAP_MAX	NPAG_BAP_MAX_PA	NPAG_BAP_MIN
NPAG_GENTLE¹	NPAG_INTERVAL¹	NPAG_RING_SIZE
PAGEDYN	PAGFILCNT	PFCDEFAULT¹
PFRATH¹	PFRATL¹	PROCSECTCNT
QUANTUM¹	+REALTIME_SPTS¹	RESHASHTBL
++S2_SIZE	SAVEDUMP	SECURITY_POLICY
SETTIME	SHADOWING	SHADOW_MAX_COPY¹
SHADOW_MBR_TMO¹	SHADOW_SYS_DISK	SHADOW_SYS_TMO
SHADOW_SYS_UNIT	SHADOW_SYS_WAIT	+SPTREQ
STARTUP_P1-8	SWPFILCNT	SWPOUTPGCNT¹
SYSMWCNT	SYSTEM_CHECK	TAILORED
TAPE_MVTIMEOUT¹	TIMEPROMPTWAIT	UAFALTERNATE
+VECTOR_MARGIN¹	+VECTOR_PROC	VIRTUALPAGECNT
WINDOW_SYSTEM¹	WSDEC¹	WSINC¹
WSMAX	WS_OPA0	XFMAXRATE¹
++ZERO_LIST_HI¹
TTY Parameters
TTY_ALTALARM	TTY_ALTYPAHD	TTY_AUTOCHAR¹
TTY_BUF	TTY_CLASSNAME	TTY_DEFCHAR
TTY_DEFCHAR2	TTY_DEFPORT	TTY_DIALTYPE
TTY_DMASIZE¹	TTY_PARITY	TTY_RSPEED
TTY_SCANDELTA	TTY_SILOTIME	TTY_SPEED
TTY_TIMEOUT¹	TTY_TYPAHDSZ

¹Dynamic parameter
++Alpha specific
+VAX specific

J.1.2 Values for Parameters

Each parameter has associated default, minimum, and maximum values that define the scope of allowable values. To determine these values, invoke SYSGEN and enter a SHOW [parameter-name] command (with appropriate qualifiers). For example, to display the values for WSMAX, you can specify SHOW WSMAX; to display the values for the TTY parameters, you can specify SHOW/TTY. You can also display parameters grouped by attributes. To display DYNAMIC parameters, for example, specify SHOW/DYNAMIC.

  6048P064.HTM
  OSSG Documentation
  26-NOV-1996 12:44:00.25

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OpenVMS System Management Utilities Reference Manual

Appendix ISHOW CLUSTER Keypad Commands

Appendix JSystem Parameters

J.1 How the Parameters Are Described

J.1.2 Values for Parameters

Appendix I
SHOW CLUSTER Keypad Commands

Appendix J
System Parameters