OpenVMS System Management Utilities Reference Manual

The default value of 7 preserves compatibility with existing DECwindows Motif behavior. A value of 0 disables all unevaluated configurations.

SETTIME

SHADOWING

Specify one of the following values:

Value	Description
0	No shadowing is enabled; SHDRIVER is not loaded. This is the default value.
2	Phase II shadowing enabled. SHDRIVER is loaded. Phase II shadowing provides shadowing of all disks located on a standalone system or an OpenVMS Cluster system.

Note

A parameter value of 1 represents Phase I, which is no longer supported. Instead, use Phase II shadowing.

SHADOW_MAX_COPY (A,D)

Carefully consider the needs of each shadowed VAX node when you set this parameter. Too high a value for SHADOW_MAX_COPY can affect performance by allowing too many copy threads to operate in parallel. Too low a value unnecessarily restricts the number of threads your system can effectively handle.

See Volume Shadowing for OpenVMS for more information about setting system parameters for volume shadowing.

SHADOW_MBR_TMO (D)

The SHADOW_MBR_TMO parameter is valid for use only with Phase II of Volume Shadowing for OpenVMS. You cannot set this parameter for use with Phase I, which is obsolete.

Use the SHADOW_MBR_TMO parameter (a word) to specify the number of seconds, in decimal from 1 to 65,535, during which recovery of a repairable shadow set is attempted. If you do not specify a value or if you specify 0, the default delay of 20 seconds is used.

Because SHADOW_MBR_TMO is a dynamic parameter, you should use the SYSGEN command WRITE CURRENT to permanently change its value.

SHADOW_REMOVE_1

SHADOW_REMOVE_2

SHADOW_SYS_DISK

In addition, you should specify a system disk shadow set virtual unit number with the SHADOW_SYS_UNIT system parameter, unless the desired system disk unit number is DSA0.

To enable minimerge on a system disk, add the value 4096 to your existing SHADOW_SYS_DISK value. For example, if you have SHADOW_SYS_DISK set to a value of 1, change it to 4097 to enable minimerge. Also be sure to set the DUMPSTYLE parameter to dump off system disk, as described in OpenVMS Version 7.1 Release Notes.

SHADOW_SYS_TMO

• At system boot time, when this is the first node in the cluster to boot and to create this specific shadow set. If the proposed shadow set is not currently mounted in the cluster, use this parameter to extend the time a booting system waits for all former members of the shadowed system disk to become available.
• Once the system successfully mounts the virtual unit and begins normal operations. In this usage, the SHADOW_SYS_TMO parameter controls the time the operating system waits for errant members of a system disk. (Use the SHADOW_MBR_TMO parameter to control the time the operating system waits for the errant members of an application disk.)

This parameter applies only to members of the system disk shadow set. All nodes using a particular system disk shadow set should have their SHADOW_SYS_TMO parameter set to the same value once normal operations begin.

The default value is 20 seconds. Change this parameter to a higher value if you want the system to wait more than the 20-second default for all members to join the shadow set. You can set the parameter value to 20 through 65,535 seconds.

SHADOW_SYS_UNIT

SHADOW_SYS_WAIT

The default value is 256 seconds. Change this parameter to a higher value if you want the system to wait more than the 256-second default for all members to join the shadow set. You can set the parameter value to 1 through 65,535 seconds.

SMP_CPUS

The default value of SMP_CPUS, --1, boots all available CPUs into the multiprocessing system.

Note that, although a bit in the mask corresponds to the primary processor's CPU ID, the primary processor is always booted. That is, if the mask is set to 0, the primary CPU will still boot. Any available secondary processors will not be booted into the multiprocessing system.

This parameter is ignored if the MULTIPROCESSING parameter is set to 0.

SMP_LNGSPINWAIT

The default value is 3 seconds (300,000 10-microsecond intervals).

SMP_SANITY_CNT

The default value is 300 milliseconds (30 10-millisecond intervals).

SMP_SPINWAIT

A timeout causes a CPUSPINWAIT bugcheck.

The default value is 100 milliseconds (10,000 10-microsecond intervals).

SPTREQ (A)

• Executive image
• RMS image
• SYSMSG.EXE file
• Multiport memory structures
• Each MASSBUS adapter
• Each UNIBUS adapter
• Each DR32 adapter

The number of system page table entries required for all other purposes is automatically computed and added to the value of SPTREQ to yield the actual size of the system page table.

STARTUP_P1--8

STARTUP_P2 controls whether verification is set during the execution of the system-independent startup procedure. If STARTUP_P2 is blank, verification is not enabled; "TRUE" indicates that verification is enabled.

STARTUP_P3 through STARTUP_P8 are reserved for future use.

SWPFILCNT

SWPOUTPGCNT (A on VAX,D)

On VAX systems, SWPOUTPGCNT defines the minimum number of pages to which the swapper should attempt to reduce a process before swapping it out. The pages taken from the process are placed into the free-page list.

On Alpha systems, SWPOUTPGCNT defines the minimum number of pagelets to which the swapper should attempt to reduce a process before swapping it out. The pagelets taken from the process are placed into the free-page list.

SYSMWCNT (A,G,M)

While a high value takes space away from user working sets, a low value can seriously impair system performance. Appropriate values vary, depending on the level of system use. When the system is running at full load, check the rate of system faults with the MONITOR PAGE command of the Monitor utility. An average system page fault rate of between 0 and 3 page faults per second is desirable. If the system page fault rate is high, and especially if the system seems to be slow, you should increase the value of SYSMWCNT. However, do not set this parameter so high that system page faulting never occurs.

SYSTEM_CHECK

Enabling SYSTEM_CHECK causes the system to behave as if the following system parameter values are set (although the values of the following parameters are not actually changed):

Parameter	Value	Description
BUGCHECKFATAL	1	Crash the system on nonfatal bugchecks
POOLCHECK	%X616400FF	Enable all poolchecking, with an allocated pool pattern of %x61616161 ('aaaa') and deallocated pool pattern of x64646464 ('dddd')
MULTIPROCESSING	2	Enable full synchronization checking

While SYSTEM_CHECK is enabled, the previous settings of the BUGCHECKFATAL and MULTIPROCESSING parameters are ignored. However, setting the parameter POOLCHECK to a nonzero value overrides the setting imposed by SYSTEM_CHECK.

Setting SYSTEM_CHECK creates certain image files that are capable of the additional system monitoring. These image files are located in SYS$LOADABLE_IMAGES and can be identified by the suffix _MON.

TAILORED

TAPE_ALLOCLASS

The TAPE_ALLOCLASS parameter can also be used to generate a unique clusterwide name for tape devices with identical unit numbers.

TAPE_MVTIMEOUT (D)

TIMEPROMPTWAIT

Note

Digital recommends that you set the correct system time before allowing the system to run, so that all functions using time-stamping (such as the operator log, the error log, accounting records, file creation dates, and file expiration dates) will contain correct time values.

Depending on the value specified for the TIMEPROMPTWAIT parameter, the system acts in one of the following ways:

• If TIMEPROMPTWAIT is 0, no prompt or wait occurs; the system boots immediately, using the time of the last boot as the system time.
• If TIMEPROMPTWAIT is a positive number less than 32768, one prompt is issued and the value dictates how many seconds you can take to respond with a time. If you do not provide a time before TIMEPROMPTWAIT elapses, the system boots, using the time of the last boot as the system time.
• If TIMEPROMPTWAIT is a number in the range of 32768 through 65535, the prompt for the time is issued at intervals starting with 2 and doubling until 256 seconds is reached. If no response is received, the prompts restart, with the 2-second interval. This prompting process repeats indefinitely, until you specify a time.

TIMVCFAIL (D)

TMSCP_LOAD (A)

When TMSCP_LOAD is set to 0, it inhibits the loading of the tape server and the serving of local tapes. When TMSCP is set to 1, it loads the tape server into memory at the time the system is booted, and makes all directly connected tape drives available clusterwide. The following table describes the two states of the TMSCP_LOAD parameter:

State	Function
0	Do not load the TMSCP tape server. Do not serve any local tape devices clusterwide. This is the default value.
1	Load the TMSCP tape server. Serve all local TMSCP tape devices clusterwide.

TMSCP_SERVE_ALL

The following table describes the parameter settings:

State	Function
0	Do not serve tapes. This is the default value.
1	Serve all available tapes.
2	Serve only locally connected tapes.

TTY_ALTALARM

TTY_ALTYPAHD

The default value is usually adequate. Do not exceed the maximum value of 32767 when setting this parameter.

TTY_AUTOCHAR (D)

TTY_BUF

TTY_CLASSNAME

TTY_DEFCHAR

Note

Do not set NOTYPEAHEAD, CRFILL, or LFFILL characteristics as the default in TTY_DEFCHAR.

Where a condition is false, the value is 0.

The upper byte is the page length. The default characteristics are 24 lines per page, terminal synchronization, wraparound, lowercase, scope, and full-duplex.

TTY_DEFCHAR2

The defaults are AUTOBAUD and EDITING.

TTY_DEFPORT

TTY_DIALTYPE

TTY_DMASIZE (D)

TTY_PARITY

TTY_RSPEED

TTY_SCANDELTA

TTY_SILOTIME

TTY_SPEED

TTY_TIMEOUT (D)

TTY_TYPAHDSZ

UAFALTERNATE (G,M)

UDABURSTRATE (G)

USERD1 (D)

  6048P068.HTM
  OSSG Documentation
  26-NOV-1996 12:44:07.01

Copyright © Digital Equipment Corporation 1996. All Rights Reserved.

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