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HP OpenVMS Systems Documentation

HP OpenVMS System Management Utilities Reference Manual

The default value for this parameter is adequate for most systems. However, if your site uses RMS global buffering to a significant extent, you may need to raise the value of GBLPAGFIL. Use the /GLOBAL qualifier of the Install utility to examine the number of pages consumed by RMS global buffers. The global sections used by RMS for global buffers have the prefix RMS$ followed by 8 hexadecimal digits.

Global buffers are enabled with the DCL command SET FILE/GLOBAL_BUFFERS, which is described in the HP OpenVMS DCL Dictionary.

GBLSECTIONS (A,F,G,M)

GBLSECTIONS sets the number of global section descriptors allocated in the system header at bootstrap time. Each global section requires one descriptor. Each descriptor takes 32 bytes of permanently resident memory.

The default value is sufficient for the images normally installed as shared in the system startup command procedures. Once the system is running and all global sections are created, you can examine the actual requirements with the /GLOBAL qualifier of the Install utility and reduce the value of GBLSECTIONS accordingly. However, the value of this parameter should not be set too low. If you plan to install many user images as shared, or if user programs are likely to create many global sections, you must increase the value of this parameter.

If the value of GBLSECTIONS is too small, you receive a message from the Install utility at system startup time or whenever you install images manually. Note that too large a value for GBLSECTIONS wastes physical memory.

GH_EXEC_CODE (A,F)

(Alpha and I64) GH_EXEC_CODE specifies the size in pages of the execlet code granularity hint region.

GH_EXEC_DATA (A,F)

(Alpha and I64) GH_EXEC_DATA specifies the size in pages of the execlet data granularity hint region.

GH_RES_CODE (A,F)

(Alpha and I64) GH_RES_CODE specifies the size in pages of the resident image code granularity hint region.

GH_RES_DATA (A,F)

(Alpha and I64) GH_RES_DATA specifies the size in pages of the resident image data granularity hint region.

If bit 2 of the LOAD_SYS_IMAGES parameter is set, the image LDR$WRAPUP releases all unused pages in the granularity hint region at the the end of system startup. The unused pages of the resident image granularity hint region are either reserved for future use, or given back to the free memory list.

GH_RSRVPGCNT (F)

GH_RSRVPGCNT specifies the number of pages in the resident image code granularity hint region that the Install utility can use after the system has finished booting.

GH_RSRVPGCNT specifies the number of pages that LDR$WRAPUP attempts to leave in the resident image code granularity hint region. If the GH_RSRVPGCNT number of pages is larger than the unused pages in the granularity hint region, the region is not expanded to accommodate the number of pages requested.

GLX_INST_TMO

(Alpha Galaxy platforms only) GLX_INST_TMO is the time (in milliseconds) that an instance in a Galaxy sharing set can fail to increment its timeout value before the other sharing instances presume that the instance failed and remove it from the sharing set.

The default is 20,000 milliseconds (20 seconds).

GLX_SHM_REG

For Alpha Galaxy systems, GLX_SHM_REG is the number of shared memory region structures configured into the Galaxy Management Database (GMDB). If set to 0, the default number of shared memory regions are configured.

If the condition value SS$_INSF_SHM_REG is returned for the $CRNMPSC_GDZRO_64 system service with the flag SEC$M_SHM_REG, the Galaxy shared memory code has run out of internal SHM_REG data structures. You need to increase the system parameter GLX_SHM_REG and reboot all Galaxy instances with this larger parameter value.

GROWLIM (A,D,M)

GROWLIM sets the number of pages that the system must have on the free-page list so that a process can add a page to its working set when it is above quota. GROWLIM has no effect if the process is below its working set quota. GROWLIM acts as a fast shutoff to the working set extent mechanism based on the system's free memory.

IEEE_ADDRESS

IEEE_ADDRESS is reserved for HP use only.

IEEE_ADDRESSH

IEEE_ADDRESSH is reserved for HP use only.

IJOBLIM (D)

IJOBLIM sets the maximum number of interactive jobs that can be on the system concurrently. You can control the maximum number of concurrent interactive users on the system with the DCL command SET LOGINS/INTERACTIVE.

IMGIOCNT

IMGIOCNT specifies the default number of pages of image I/O address space to be allocated for the image activator if not specified at program link time.

This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so. (Alpha and I64) IMGREG_PAGES is the number of pages to reserve in P1 space for images to be installed with shareable address data. If IMGREG_PAGES is set to 0, no images are installed with shared address data. The default is 10,000 pages.

For more information, see the INSTALL section in the HP OpenVMS System Management Utilities Reference Manual.

INTSTKPAGES (A,D,G,M)

(VAX only) INTSTKPAGES sets the size of the interrupt stack in pages. Each page on the interrupt stack requires a page of permanently resident memory.

Use the default value of 6 unless interrupt-stack-not-valid exceptions occur. These may be caused by either an unusually large number of devices or a driver that requires a large amount of stack space.

IO_PREFER_CPUS

(Alpha and I64) IO_PREFER_CPUS is a dynamic system parameter that controls the set of CPUs that are available for use as Fast Path preferred CPUs.

IO_PREFER_CPUS is a CPU bit mask specifying the CPUs that are allowed to serve as preferred CPUs and that can thus be assigned a Fast Path port. CPUs whose bit is set in the IO_PREFER_CPUS bit mask are enabled for Fast Path port assignment. IO_PREFER_CPUS defaults to -1, which specifies that all CPUs are allowed to be assigned Fast Path ports.

You might want to disable the primary CPU from serving as a preferred CPU by clearing its bit in IO_PREFER_CPUS. This reserves the primary CPU for non-Fast-Path IO operations to use.

Changing the value of IO_PREFER_CPUS causes the FASTPATH_SERVER process to execute the automatic assignment algorithm that spreads Fast Path ports evenly among the new set of usable CPUs.

For additional information, see FAST_PATH and FAST_PATH_PORTS.

IOTA

IOTA specifies the amount of time (in 10-millisecond units) to charge to the current residence quantum for each voluntary wait. The correct value approximates the cost of a disk I/O neglecting wait time.

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

IRPCOUNT (G,M)

IRPCOUNT sets the number of preallocated intermediate request packets. Each packet requires 160 bytes of permanently resident memory. If IRPCOUNT is too large, physical memory is wasted. If IRPCOUNT is too small, the system increases its value automatically, as needed, to permit proper performance. However, the system cannot increase IRPCOUNT beyond the value of IRPCOUNTV.

Allowing this growth causes a physical memory penalty. If IRPCOUNT is underconfigured, the penalty is 4 percent of physical memory from the configured value to the actual value on the running system.

You can use the DCL command SHOW MEMORY/POOL/FULL to determine IRPCOUNT usage.

IRPCOUNTV (G)

IRPCOUNTV establishes the upper limit to which IRPCOUNT can be automatically increased by the system.

If this parameter is set too low, system performance can be adversely affected because IRPCOUNTV cannot be used for nonpaged pool requests.

A physical memory penalty of 1 percent results for any unused growth space (1 longword for every 3 unused intermediate request packets).

JBOBLIM

This parameter is no longer in use.

JOBCTLD

System managers do not usually alter JOBCTLD; this word of debug flags is used in rolling upgrades of OpenVMS. If bit 0 is set, the queue manager does not start. The default is 0.

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

KFILSTCNT

This parameter is no longer used on VAX systems and is not used on Alpha and I64 systems.

KSTACKPAGES

(Alpha and I64) KSTACKPAGES controls the number of pages allocated for process kernel stacks.

LAN_FLAGS (D)

(Alpha and I64) LAN_FLAGS is a bit mask used to enable features in the local area networks port drivers and support code. The default value for LAN_FLAGS is 0.

The bit definitions are as follows:

Bit	Description
0	The default of zero indicates that ATM devices run in SONET mode. If set to 1, this bit indicates ATM devices run in SDH mode.
1	If set, this bit enables a subset of the ATM trace and debug messages in the LAN port drivers and support code.
2	If set, this bit enables all ATM trace and debug messages in the LAN port drivers and support code.
3 ¹	If set, this bit runs UNI 3.0 over all ATM adapters.
4 ¹	If set, this bit runs UNI 3.1 over all ATM adapters.
5	If set, disables auto-negotiation over all Gigabit Ethernet Adapters.
6	If set, enables the use of jumbo frames over all Gigabit Ethernet Adapters.
7	Reserved.
8	If set, disables the use of flow control over all LAN adapters that support flow control.
9	Reserved.
10	Reserved.
11	If set, disables the logging of error log entries by LAN drivers.
12	If set, enables a fast timeout on transmit requests, usually between 1 and 1.2 seconds instead of 3 to 4 second, for most LAN drivers.
13	If set, transmits that are given to the LAN device and never completed by the device (transmit timeout condition) are completed with error status (SS$_ABORT) rather than success status (SS$_NORMAL).

¹Auto-sensing of the ATM UNI version is enabled if both bit 3 and bit 4 are off (0).

LCKMGR_CPUID (D)

(Alpha and I64) LCKMGR_CPUID controls the CPU that the Dedicated CPU Lock Manager runs on. This is the CPU that the LCKMGR_SERVER process utilizes if you turn this feature on with the LCKMGR_MODE system parameter.

If the specified CPU ID is either the primary CPU or a nonexistent CPU, the LCKMGR_SERVER process utilizes the lowest nonprimary CPU. For more information, refer to the LCKMGR_MODE system parameter.

LCKMGR_MODE (D)

(Alpha and I64) The LCKMGR_MODE parameter controls use of the Dedicated CPU Lock Manager. Setting LCKMGR_MODE to a number greater than zero (0) indicates the number of CPUs that must be active before the Dedicated CPU Lock Manager is turned on.

The Dedicated CPU Lock Manager performs all locking operations on a single dedicated CPU. This can improve system performance on large SMP systems with high MP_Synch associated with the lock manager.

If the number of active CPUs is greater than or equal to LCKMGR_MODE, a LCKMGR_SERVER process is created to service locking operations. This process runs at a real-time priority of 63 and is always current.

In addition, if the number of active CPUs should ever be reduced below the required threshold by either a STOP/CPU command or by a CPU reassignment in a Galaxy configuration, the Dedicated CPU Lock Manager automatically turns off within one second, and the LCKMGR_SERVER is placed in a hibernate state. If the number of active CPUs is increased, the LCKMGR_SERVER resumes servicing locking operations.

Specify one of the following:

Zero (0) indicates that the Dedicated CPU Lock Manager is off (the default).
A number greater than zero (0) indicates the number of CPUs that must be active before the Dedicated CPU Lock Manager will turn on.

When the Dedicated CPU Lock Manager is turned on, fast path devices are not allowed on the CPU assigned to the CPU used by the Dedicated CPU Lock Manager.

For more information about use of the Dedicated CPU Lock Manager, see guide to OpenVMS Performance Management.

LGI_BRK_DISUSER (D)

LGI_BRK_DISUSER turns on the DISUSER flag in the UAF record when an attempted break-in is detected, thus permanently locking out that account. The parameter is off (0) by default. You should set the parameter (1) only under extreme security watch conditions, because it results in severely restricted user service.

LGI_BRK_LIM (D)

LGI_BRK_LIM specifies the number of failures that can occur at login time before the system takes action against a possible break-in. The count of failures applies independently to login attempts by each user name, terminal, and node. Whenever login attempts from any of these sources reach the break-in limit specified by LGI_BRK_LIM, the system assumes it is under attack and initiates evasive action as specified by the LGI_HID_TIM parameter.

The minimum value is 1. The default value is usually adequate.

LGI_BRK_TERM (D)

LGI_BRK_TERM causes the terminal name to be part of the association string for the terminal mode of break-in detection. When LGI_BRK_TERM is set to off (0), the processing considers the local or remote source of the attempt, allowing break-in detection to correlate failed access attempts across multiple terminal devices. When set to on (1), LGI_BRK_TERM assumes that only local hard-wired or dedicated terminals are in use and causes breakin detection processing to include the specific local terminal name when examining and correlating break-in attempts.

Ordinarily, LGI_BRK_TERM should be set to off (0) when physical terminal names are created dynamically, such as when network protocols like LAT and Telnet are in use.

LGI_BRK_TMO (D)

LGI_BRK_TMO specifies the length of the failure monitoring period. This time increment is added to the suspect's expiration time each time a login failure occurs. Once the expiration period passes, prior failures are discarded, and the suspect is given a clean slate.

LGI_CALLOUTS (D)

LGI_CALLOUTS specifies the number of installation security policy callout modules to be invoked at each login. LGI_CALLOUTS must be set to 0 unless callout modules are present.

LGI_HID_TIM (D)

LGI_HID_TIM specifies the number of seconds that evasive action persists following the detection of a possible break-in attempt. The system refuses to allow any logins during this period, even if a valid user name and password are specified.

LGI_PWD_TMO (D)

LGI_PWD_TMO specifies, in seconds, the period of time a user has to enter the correct system password (if used). LGI_PWD_TMO also establishes the timeout period for users to enter their personal account passwords at login time. Also, when using the SET PASSWORD command, LGI_PWD_TMO specifies the period of time the system waits for a user to type in a new password, an old password, and the password verification.

LGI_RETRY_LIM (D)

LGI_RETRY_LIM specifies the number of retry attempts allowed users attempting to log in. If this parameter is greater than 0, and a legitimate user fails to log in correctly because of typing errors, the user does not automatically lose the carrier. Instead (provided that LGI_RETRY_TMO has not elapsed), by pressing the Return key, the user is prompted to enter the user name and password again. Once the specified number of attempts has been made without success, the user loses the carrier. As long as neither LGI_BRK_LIM nor LGI_BRK_TMO has elapsed, the user can dial in again and reattempt login.

LGI_RETRY_TMO (D)

LGI_RETRY_TMO specifies the number of seconds allowed between login retry attempts after each login failure. (Users can initiate login retries by pressing the Return key.) This parameter is intended to be used with the LGI_RETRY_LIM parameter; it allows dialup users a reasonable amount of time and number of opportunities to attempt logins before they lose the carrier.

LNMPHASHTBL (A on VAX,G)

LNMPHASHTBL sets the size of the process logical name hash table. Logical names are hashed using a function of the name length and contents. The LNMPHASHTBL parameter determines the number of entries for process-private logical names. The recommended setting is the average number of process-private logical names. Note that the hashed values are rounded up to the nearest power of 2.

LNMSHASHTBL (A,F,G)

LNMSHASHTBL sets the size of the system logical name hash table. Logical names are hashed using a function of the name length and contents. The LNMSHASHTBL parameter determines the number of entries for shareable logical names. These names include all names from the system, group, and job logical name tables. The recommended setting allows one to four logical names per hash table entry. The default setting is usually adequate, unless your installation has a large number of groups, or many jobs are active simultaneously. In that case, an increase in the value of the next higher power of 2 might improve logical name translation performance. Note that the hashed values are rounded up to the nearest power of 2.

LOAD_PWD_POLICY

LOAD_PWD_POLICY controls whether the SET PASSWORD command attempts to use site-specific password policy routines, which are contained in the shareable image SYS$LIBRARY:VMS$PASSWORD_POLICY.EXE. The default is 0, which indicates not to use policy routines.

LOAD_SYS_IMAGES (A on Alpha and I64)

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

LOAD_SYS_IMAGES controls the loading of system images described in the system image data file, VMS$SYSTEM_IMAGES. This parameter is a bit mask.

On VAX systems, the following bit is defined:

Bit	Description
0 (SGN$V_LOAD_SYS_IMAGES)	Enables loading alternate execlets specified in VMS$SYSTEM_IMAGES.DATA.

On Alpha and I64 systems, the following bits are defined:

Bit	Description
0 (SGN$V_LOAD_SYS_IMAGES)	Enables loading alternate execlets specified in VMS$SYSTEM_IMAGES.DATA.
1 (SGN$V_EXEC_SLICING)	Enables executive slicing.
2 (SGN$V_RELEASE_PFNS)	Enables releasing unused portions of the Alpha and I64 huge pages.

These bits are on by default. Using conversational bootstrap exec slicing can be disabled.

LOCKDIRWT (A)

LOCKDIRWT determines the portion of lock manager directory that this system handles. The default value is usually adequate.

LOCKIDTBL (A,F,M)

LOCKIDTBL sets the initial number of entries in the system Lock ID table and defines the amount by which the Lock ID table is extended whenever the system runs out of locks. One entry must exist for each lock in the system; each entry requires 4 bytes.

For simple timesharing systems, the default value is adequate. If your application uses many locks, as in the case of heavy RMS file sharing or a database management application, you should increase this parameter. When you change the value of LOCKIDTBL, examine the value of RESHASHTBL and change it if necessary.

The OpenVMS Lock Management facility is described in the HP OpenVMS Programming Concepts Manual. You can monitor locks with the MONITOR LOCK command of the Monitor utility.

LOCKIDTBL_MAX

LOCKIDTBL_MAX is obsolete beginning with OpenVMS Version 7.1.

LOCKRETRY

LOCKRETRY establishes the number of attempts made to lock a multiprocessor data structure.

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

LONGWAIT (A on Alpha and I64,D,G,M)

LONGWAIT defines how much real time (in seconds) must elapse before the swapper considers a process to be temporarily idle. This parameter is applied to local event flag (LEF) and hibernate (HIB) waits to detect such conditions as an inactive terminal or ACP.

MAXBOBMEM (D)

(Alpha and I64) MAXBOBMEM defines the maximum amount of physical memory, measured in pagelets, that can be associated with a single buffer object created by a process in user mode. The default value of 0 means there is no system-imposed limit on the size of a buffer object.

Other MAXBOB* parameters are obsolete beginning with OpenVMS Version 7.3.

MAXBUF (D)

MAXBUF sets the maximum allowable size for any single buffered I/O packet. Buffered I/O packets are allocated from the permanently resident nonpaged dynamic pool. The terminal, mailbox, and printer device drivers are examples of device drivers that perform buffered I/O.

The number of bytes specified in the I/O request plus the size of a driver-dependent and function-dependent header area determine the required buffered I/O packet size. The size of the header area is a minimum of 16 bytes; there is no absolute upper limit. However, this header area is usually a few hundred bytes in size.

On OpenVMS VAX systems beginning with Version 7.1, the default value is 4112. The default value on Alpha and I64 systems continues to be 8192.

The maximum value of MAXBUF is 64000 bytes.

MAXCLASSPRI (D)

If class scheduling is enabled, MAXCLASSPRI sets the maximum range in the priority range of class-scheduled processes.

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

MAXPROCESSCNT (A,F,G,M)

MAXPROCESSCNT sets the number of process entry slots allocated at bootstrap time. One slot is required for each concurrent process on the system. Each slot requires 6 bytes of permanently resident memory.

The default value is normally configured to allow you to create the desired number of processes. If the following message appears, you need to increase the value of MAXPROCESSCNT:

%SYSTEM-F-NOSLOT,  No PCB to create process

On Alpha and I64 systems beginning with Version 8.1, the default value is 32,767.

MAXQUEPRI (D)

MAXQUEPRI determines the highest scheduling priority that can be assigned to jobs entered in batch and output (printer, server, and terminal) queues without the submitter process having OPER or ALTPRI privilege. The value of this parameter can range from 0 to 255; the default is 100. The value of MAXQUEPRI should be greater than or equal to DEFQUEPRI.

Note

MAXQUEPRI refers to relative queue scheduling priority, not to the execution priority of the job.

MAXSYSGROUP (D)

MAXSYSGROUP sets the highest value that a group number can have and still be classified as a system UIC group number. Note that the specification is not in octal unless preceded by the %O radix indicator. This parameter is normally left at 8 (10 octal).

MC_SERVICES_P0 (D)

(Alpha only) MC_SERVICES_P0 controls whether other MEMORY CHANNEL nodes in the cluster continue to run if this node bugchecks or shuts down.

A value of 1 causes other nodes in the MEMORY CHANNEL cluster to crash with bugcheck code MC_FORCED_CRASH if this node bugchecks or shuts down.

The default value is 0. A setting of 1 is intended only for debugging purposes; the parameter should otherwise be left at its default value.

MC_SERVICES_P1 (D)

(Alpha only) This special parameter is reserved for HP use. Its value must be the same on all nodes connected by MEMORY CHANNEL.

MC_SERVICES_P2

(Alpha only) MC_SERVICES_P2 specifies whether to load the PMDRIVER (PMA0) MEMORY CHANNEL cluster port driver.

PMDRIVER is a driver that serves as the MEMORY CHANNEL cluster port driver. It works together with MCDRIVER (the MEMORY CHANNEL device driver and driver interface) to provide MEMORY CHANNEL clustering. If PMDRIVER is not loaded, cluster connections are not made over the MEMORY CHANNEL interconnect.

The default value is 1, which causes PMDRIVER to be loaded when you boot the system. When you run CLUSTER_CONFIG.COM and select the MEMORY CHANNEL option, PMDRIVER is loaded automatically when you reboot the system.

HP recommends that this value not be changed. This parameter value must be the same on all nodes connected by MEMORY CHANNEL.

MC_SERVICES_P3 (D)

(Alpha only) MC_SERVICES_P3 specifies the maximum number of tags supported. The maximum value is 2048, and the minimum value is 100.

The default value is 800. HP recommends that this value not be changed. This parameter value must be the same on all nodes connected by MEMORY CHANNEL.

MC_SERVICES_P4

(Alpha only) MC_SERVICES_P4 specifies the maximum number of regions supported. The maximum value is 4096, and the minimum value is 100.

The default value is 200. HP recommends that this value not be changed. This parameter value must be the same on all nodes connected by MEMORY CHANNEL.

MC_SERVICES_P5 (D)

(Alpha only) MC_SERVICES_P5 is reserved for HP use only and must remain at the default value of 8000000. This value must be the same on all nodes connected by MEMORY CHANNEL.

MC_SERVICES_P6

(Alpha only) MC_SERVICES_P6 specifies MEMORY CHANNEL message size, the body of an entry in a free queue, or a work queue. The maximum value is 65536, and the minimum value is 544.

The default value is 992. This value is suitable in all cases except for systems with highly constrained memory. For such systems, you can reduce the memory consumptions of MEMORY CHANNEL by slightly reducing the default value of 992. The value of MC_SERVICES_P6 must always be equal to or greater than the result of the following calculations:

Select the larger of SCS_MAXMSG and SCS_MAXDG.
Round that value up to the next quadword.

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