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| Document revision date: 19 July 1999 | |
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This appendix describes OpenVMS system parameters.
Compaq 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. |
System parameters can be grouped into categories, as shown in Section J.1.1. Also, 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 Compaq. These parameters should only be changed if recommended by Compaq personnel, or if they are clearly stated to change in the installation guide or release notes of a Compaq-supplied layered product. |
| 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.
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 |
Table J-1 lists system parameters according to category. Footnotes indicate dynamic and system-specific parameters.
| ACP Parameters | ||
|---|---|---|
| ACP_BASEPRIO 1 | ACP_DATACHECK 1 | ACP_DINDXCACHE 1 |
| ACP_DIRCACHE 1 | ACP_EXTCACHE 1 | ACP_EXTLIMIT 1 |
| ACP_FIDCACHE 1 | ACP_HDRCACHE 1 | ACP_MAPCACHE 1 |
| ACP_MAXREAD 1 | ACP_MULTIPLE 1 | ACP_QUOCACHE 1 |
| ACP_REBLDSYSD | ACP_SHARE 1 | ACP_SWAPFLGS 1 |
| ACP_SYSACC 1 | ACP_WINDOW 1 | ACP_WORKSET 1 |
| ACP_WRITEBACK 1 | ACP_XQP_RES 1 | |
| CLUSTER Parameters | ||
| ALLOCLASS | +CHECK_CLUSTER | CLUSTER_CREDITS |
| CWCREPRC_ENABLE | DISK_QUORUM 1 | ++DR_UNIT_BASE |
| EXPECTED_VOTES | LOCKDIRWT | MPW_WRTCLUSTER |
| MSCP_BUFFER | MSCP_CMD_TMO | MSCP_CREDITS |
| MSCP_LOAD | MSCP_SERVE_ALL | NISCS_CONV_BOOT |
| NISCS_LAN_OVRHD | NISCS_LOAD_PEA0 | NISCS_MAX_PKTSZ |
| NISCS_PORT_SERV | QDSKINTERVAL | QDSKSVOTES |
| RECNXINTERVAL 1 | TAPE_ALLOCLASS | TMSCP_LOAD |
| TMSCP_SERVE_ALL | VAXCLUSTER | VOTES |
| JOB Parameters | ||
| DEFPRI 1 | DEFQUEPRI 1 | IJOBLIM 1 |
| MAXQUEPRI 1 | NJOBLIM 1 | RJOBLIM 1 |
| LGI Parameters | ||
| LGI_BRK_DISUSER 1 | LGI_BRK_LIM 1 | LGI_BRK_TERM 1 |
| LGI_BRK_TMO 1 | LGI_CALLOUTS 1 | LGI_HID_TIM 1 |
| LGI_PWD_TMO 1 | LGI_RETRY_LIM 1 | LGI_RETRY_TMO 1 |
| MULTIPROCESSING Parameters | ||
| ++IO_PREFER_CPUS | MULTIPROCESSING | SMP_CPUS |
| SMP_LNGSPINWAIT | SMP_SANITY_CNT | SMP_SPINWAIT |
| PQL Parameters | ||
| PQL_DASTLM 1 | PQL_DBIOLM 1 | PQL_DBYTLM 1 |
| PQL_DCPULM 1 | PQL_DDIOLM 1 | PQL_DENQLM 1 |
| PQL_DFILLM 1 | PQL_DJTQUOTA | PQL_DPGFLQUOTA 1 |
| PQL_DPRCLM 1 | PQL_DTQELM 1 | PQL_DWSDEFAULT |
| PQL_DWSEXTENT 1 | PQL_DWSQUOTA 1 | PQL_MASTLM 1 |
| PQL_MBIOLM 1 | PQL_MBYTLM 1 | PQL_MCPULM 1 |
| PQL_MDIOLM 1 | PQL_MENQLM 1 | PQL_MFILLM 1 |
| PQL_MJTQUOTA 1 | PQL_MPGFLQUOTA 1 | PQL_MPRCLM 1 |
| PQL_MTQELM 1 | PQL_MWSDEFAULT | PQL_MWSEXTENT 1 |
| PQL_MWSQUOTA 1 | ||
| RMS Parameters | ||
| RMS_DFMBC 1 | RMS_DFMBFIDX 1 | RMS_DFMBFREL 1 |
| RMS_DFMBFSDK 1 | RMS_DFMBFSMT 1 | RMS_DFMBFSUR 1 |
| RMS_DFNBC 1 | RMS_EXTEND_SIZE 1 | RMS_FILEPROT |
| RMS_PROLOGUE 1 | ||
| SCS Parameters | ||
| PAMAXPORT 1 | PANOPOLL 1 | PANUMPOLL 1 |
| PAPOLLINTERVAL 1 | PAPOOLINTERVAL 1 | PASANITY 1 |
| PASTDGBUF | PASTIMOUT 1 | PRCPOLINTERVAL 1 |
| SCSBUFFCNT | SCSCONNCNT | SCSFLOWCUSH 1 |
| SCSMAXDG | SCSMAXMSG | SCSNODE |
| SCSRESPCNT | SCSSYSTEMID | SCSSYSTEMIDH |
| ++SMCI_FLAGS 1 | ++SMCI_PORTS | TIMVCFAIL 1 |
| UDABURSTRATE | ||
| Special Parameters | ||
| AFFINITY_SKIP | AFFINITY_TIME | BREAKPOINTS |
| CHANNELCNT | +CLOCK_INTERVAL | CONCEAL_DEVICES |
| CRD_CONTROL | CTLIMGLIM | CTLPAGES |
| DISABLE_UPCALLS 1 | +DLCKEXTRASTK | DNVOSI1 |
| EXUSRSTK | ++FAST_PATH | IMGIOCNT |
| IOTA | JOBCTLD | LOAD_SYS_IMAGES |
| LOCKRETRY | MAXCLASSPRI 1 | ++MC_SERVICES_P0-9 |
| MINCLASSPRI 1 | MPW_PRIO | NOAUTOCONFIG 1 |
| NOCLUSTER | NOPGFLSWP | PAGTBLPFC |
| PE* | ++PFN_COLOR_COUNT | ++PHYSICAL_MEMORY |
| +PHYSICALPAGES | PIOPAGES 1 | PIXSCAN 1 |
| POOLCHECK 1 | POOLPAGING | PRIORITY_OFFSET |
| +PSEUDOLOA | PU_OPTIONS | +QBUS_MULT_INTR |
| RESALLOC | RSRVPAGCNT | S0_PAGING |
| SA_APP | +SBIERRENABLE | +SCH_CTLFLAGS 1 |
| +SCSI_NOAUTO 1 | ++SCSICLUSTER_P[1-4] | SMP_CPUSH |
| SMP_TICK_CNT | SSINHIBIT | +SWPALLOCINC |
| SWPFAIL | SWPRATE | SWP_PRIO |
| SYSPFC | TBSKIPWSL | TIME_CONTROL 1 |
| TTY_DEFPORT | +VBN_CACHE_S | +VBSS_ENABLE |
| +VBSS_ENABLE2 | ++VCC_FLAGS | ++VCC_MAXSIZE |
| +VCC_MINSIZE | +VCC_PTES | VMS |
| WPRE_SIZE 1 | WPTTE_SIZE 1 | WRITABLESYS |
| WRITESYSPARAMS 1 | XQPCTL2 | XQPCTLD1 |
| SYS Parameters | ||
| ++ARB_SUPPORT 1 | AWSMIN 1 | AWSTIME 1 |
| BALSETCNT | BORROWLIM 1 | BUGCHECKFATAL 1 |
| BUGREBOOT 1 | CLASS_PROT 1 | CLISYMTBL 1 |
| ++CRDENABLE | ++DBGTK_SCRATCH | DEADLOCK_WAIT 1 |
| DEFMBXBUFQUO 1 | DEFMBXMXMSG 1 | ++DEVICE_NAMING |
| DORMANTWAIT 1 | DUMPBUG | DUMPSTYLE 1 |
| ERLBUFFERPAGES | ERRORLOGBUFFERS | EXTRACPU 1 |
| FREEGOAL 1 | FREELIM | ++GALAXY |
| GBLPAGES 1 | GBLPAGFIL 1 | GBLSECTIONS |
| ++GH_EXEC_CODE | ++GH_EXEC_DATA | ++GH_RES_CODE |
| ++GH_RES_DATA | GH_RSRVPGCNT | ++GLX_INST_TMO |
| GROWLIM 1 | ++IMGREG_PAGES | +INTSTKPAGES 1 |
| ++KSTACKPAGES | +LAMAPREGS | ++LAN_FLAGS 1 |
| LNMPHASHTBL | LNMSHASHTBL | LOAD_PWD_POLICY |
| LOCKIDTBL | LONGWAIT 1 | ++MAXBOBMEM 1 |
| ++MAXBOBS0S1 1 | ++MAXBOBS2 1 | MAXBUF 1 |
| MAXPROCESSCNT | MAXSYSGROUP 1 | MINWSCNT |
| MMG_CTLFLAGS 1 | ++MPDEV_ENABLE | ++MPDEV_LCRETRIES |
| ++MPDEV_POLLER | ++MPDEV_REMOTE | MPW_HILIMIT |
| MPW_IOLIMIT | MPW_LOLIMIT | MPW_LOWAITLIMIT 1 |
| MPW_THRESH 1 | MPW_WAITLIMIT 1 | MULTITHREAD |
| MVTIMEOUT 1 | NET_CALLOUTS 1 | NPAGEDYN |
| NPAGEVIR | ++NPAG_AGGRESSIVE 1 | ++NPAG_BAP_MAX |
| ++NPAG_BAP_MAX_PA | ++NPAG_BAP_MIN | ++NPAG_BAP_MIN_PA |
| ++NPAG_GENTLE 1 | ++NPAG_INTERVAL 1 | ++NPAG_RING_SIZE |
| PAGEDYN | PAGFILCNT | PFCDEFAULT 1 |
| PFRATH 1 | PFRATL 1 | PROCSECTCNT |
| QUANTUM 1 | +REALTIME_SPTS 1 | RESHASHTBL |
| ++S2_SIZE | SAVEDUMP | SECURITY_POLICY |
| SETTIME | SHADOWING | SHADOW_MAX_COPY 1 |
| SHADOW_MBR_TMO 1 | SHADOW_SYS_DISK | SHADOW_SYS_TMO |
| SHADOW_SYS_UNIT | SHADOW_SYS_WAIT | +SPTREQ |
| STARTUP_P1-8 | SWPFILCNT | SWPOUTPGCNT 1 |
| SYSMWCNT | SYSTEM_CHECK | TAILORED |
| TAPE_MVTIMEOUT 1 | TIMEPROMPTWAIT | UAFALTERNATE |
| USERD1 1 | USERD2 1 | USER3 |
| USER4 | +VECTOR_MARGIN 1 | +VECTOR_PROC |
| VIRTUALPAGECNT | WINDOW_SYSTEM 1 | ++WLKSYSDSK |
| WSDEC 1 | WSINC 1 | WSMAX |
| +WS_OPA0 | XFMAXRATE 1 | ++ZERO_LIST_HI 1 |
| TTY Parameters | ||
| TTY_ALTALARM | TTY_ALTYPAHD | TTY_AUTOCHAR 1 |
| TTY_BUF | TTY_CLASSNAME | TTY_DEFCHAR |
| TTY_DEFCHAR2 | TTY_DIALTYPE | TTY_DMASIZE 1 |
| TTY_PARITY | TTY_RSPEED | TTY_SCANDELTA |
| TTY_SILOTIME | TTY_SPEED | TTY_TIMEOUT 1 |
| TTY_TYPAHDSZ | ||
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, specify SHOW WSMAX; to display the values for the TTY parameters, specify SHOW/TTY. You can also display parameters grouped by attributes. To display DYNAMIC parameters, for example, specify SHOW/DYNAMIC.
Default values for system parameters allow booting on any supported OpenVMS configuration. SYSGEN displays default values under the heading default when you enter the SYSGEN command SHOW [parameter-name] for one of the parameter categories or attributes. Reset the default parameter values with the USE DEFAULT command.
However, to avoid starting all layered products on a system that is not tuned for them, possibly causing the system to become nonoperational, set the STARTUP_P1 system parameter to "MIN."
The computed, installed value referred to in this section is the value derived by the AUTOGEN command procedure. (See the OpenVMS System Manager's Manual.)
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