OpenVMS System Management Utilities Reference Manual

Digital recommends that NISCS_LAN_OVRVHD be set to the same value on all nodes in the cluster.

NISCS_LOAD_PEA0

NISCS_LOAD_PEA0 controls whether the NI-SCS port driver PEDRIVER is loaded during system boot. The default of 0 specifies that the PEDRIVER is not loaded.

NISCS_MAX_PKTSZ (A on Alpha)

NISCS_MAX_PKTSZ defines the size in bytes of the data area in the largest packet sent by NISCA on any local area network (LAN). PEDRIVER uses this value, together with the NISCS_LAN_OVRHD parameter, to compute the maximum amount of data to transmit in any LAN packet:

        LAN packet size = LAN header (padded Ethernet format) 
                        + NISCS_MAX_PKTSZ value 
                        - NISCS_LAN_OVRHD value 
                        + CRC or FCS

For performance reasons, PEDRIVER limits the packet size so that the packets can be allocated from a lookaside list in nonpaged pool. The actual allocation includes the required data structure overhead used by PEDRIVER and the LAN drivers. However, lookaside lists are provided for the allocation sizes required when using maximum size packets on both Ethernet and FDDI. This allows PEDRIVER to take full advantage of these interconnects.

NISCS_PORT_SERV (A)

NISCS_PORT_SERV provides flag bits for PEDRIVER port services. Bits 0 and 1 set (decimal value 3) enables data checking. The remaining bits are reserved for future use.

NJOBLIM (D)

NJOBLIM establishes the limit for network jobs. The maximum number of jobs is 1024. The minimum is 0, and the default is 16.

NPAGEDYN (A,F,G,M)

NPAGEDYN sets the size of the nonpaged dynamic pool in bytes. This figure is rounded down to an integral number of pages. NPAGEDYN establishes the initial setting of the nonpaged pool size, but the pool size can be increased dynamically.

To set a value for this parameter, use AUTOGEN initially, and then monitor the amount of space actually used with the DCL command SHOW MEMORY/POOL/FULL.

NPAGEVIR (A, G)

NPAGEVIR defines the maximum size to which NPAGEDYN can be increased. If this value is too small, the system can hang. If NPAGEVIR is too large, the result is a penalty of 4 bytes per extra page on VAX and 8 bytes per extra page on Alpha.

NPAG_AGGRESSIVE (D)

On Alpha systems, NPAG_AGGRESSIVE is the percentage of packets on a nonpaged pool lookaside list that remain after the list is trimmed during aggressive reclamation.

NPAG_BAP_MAX

On Alpha systems, NPAG_BAP_MAX is the maximum of bus addressable pool sizes requested.

NPAG_BAP_MAX_PA

On Alpha systems, NPAG_BAP_MAX_PA is the smallest of the maximum bus addressable pool physical addresses requested.

NPAG_BAP_MIN

On Alpha systems, NPAG_BAP_MIN is the minimum of bus addressable pool sizes requested.

NPAG_GENTLE (D)

On Alpha systems, NPAG_GENTLE is the percentage of packets on a nonpaged pool lookaside list that remain after the list is trimmed during gentle reclamation.

NPAG_INTERVAL (D)

On Alpha systems, NPAG_INTERVAL is the number of seconds between passes of nonpaged pool gentle reclamation.

NPAG_RING_SIZE

On Alpha systems, NPAG_RING_SIZE is the number of entries in the ring buffer.

PAGEDYN (A,F,G,M)

PAGEDYN sets the size of the paged dynamic pool in bytes. The specified value is rounded down to an integral number of pages. Each page of paged dynamic pool adds 8 bytes of permanently resident memory to the system page table; the paged dynamic pool has no other direct memory requirements.

The paged dynamic pool is used to allocate storage for shared logical names, resident image headers, known file list entries, and RMS file-sharing structures. Substantial amounts of space for the pool can be overallocated with little effect on system performance.

The size of the paged pool can grow dynamically up to the maximum size that this parameter specifies.

PAGFILCNT (G)

PAGFILCNT defines the maximum number of page files that can be installed.

PAMAXPORT (D)

PAMAXPORT specifies the maximum port number to be polled on each CI and DSSI. The CI and DSSI port drivers poll to discover newly initialized ports or the absence/failure of previously responding remote ports.

A system will not detect the existence of ports whose port numbers are higher than this parameter's value. Thus, this parameter should be set to a value that is equal to or greater than the highest port number being used on any CI or DSSI connected to the system.

You can decrease this parameter to reduce polling activity if the hardware configuration has fewer than 16 ports. For example, if the CI or DSSI with the largest configuration has a total of 5 ports assigned to port numbers 0 through 4, you could set PAMAXPORT to 4.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

The default for this parameter is 15 (poll for all possible ports 0 through 15). Digital recommends that you set this parameter to the same value on each cluster computer.

PANOPOLL (D)

Disables CI and DSSI polling for ports if set to 1. (The default is 0.) When PANOPOLL is set, a computer will not discover that another computer has shut down or powered down promptly and will not discover a new computer that has booted. This parameter is useful when you want to bring up a computer detached from the rest of the cluster for checkout purposes.

PANOPOLL is functionally equivalent to uncabling the system from the DSSI or star coupler. This parameter does not affect OpenVMS Cluster communications by LAN.

The default value of 0 is the normal setting and is required if you are booting from an HSC controller or if your system is joining an OpenVMS Cluster. This parameter is ignored if no CI or DSSI devices are configured on your system.

PANUMPOLL (D)

PANUMPOLL establishes the number of CI and DSSI ports to be polled each polling interval. The normal setting for PANUMPOLL is 16.

On systems with less powerful CPUs, the parameter may be useful in applications sensitive to the amount of contiguous time that the system spends at IPL 8. Reducing PANUMPOLL reduces the amount of time spent at IPL 8 during each polling interval, while increasing the number of polling intervals needed to discover new or failed ports.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

PAPOLLINTERVAL (D)

Specifies, in seconds, the polling interval the CI port driver uses to poll for a newly booted computer, a broken port-to-port virtual circuit, or a failed remote computer.

This parameter trades polling overhead against quick response to virtual circuit failures. Digital recommends that you use the default value for this parameter.

Digital recommends that you set this parameter to the same value on each cluster computer.

PAPOOLINTERVAL (D)

Specifies, in seconds, the interval at which the port driver checks available nonpaged pool after a pool allocation failure.

This parameter trades faster response to pool allocation failures against increased polling overhead. Digital recommends that you use the default value for this parameter.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

PASANITY (D)

PASANITY controls whether the CI and DSSI port sanity timers are enabled to permit remote systems to detect a system that has been hung at IPL 8 or above for 100 seconds. It also controls whether virtual circuit checking gets enabled on the local system. The TIMVCFAIL parameter controls the time (1-99 seconds).

PASANITY is normally set to 1 and should be set to 0 only when you are debugging with XDELTA or planning to halt the CPU for periods of 100 seconds or more.

PASANITY is only semidynamic. A new value of PASANITY takes effect on the next CI or DSSI port reinitialization.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

PASTDGBUF (A)

The number of datagram receive buffers to queue initially for each CI or DSSI port driver's configuration poller; the initial value is expanded during system operation, if needed.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

PASTIMOUT (D)

The basic interval at which the CI port driver wakes up to perform time-based bookkeeping operations. It is also the period after which a timeout will be declared if no response to a start handshake datagram has been received.

If CI or DSSI devices are not configured on your system, this parameter is ignored.

The default value should always be adequate.

PFCDEFAULT (A,D)

On VAX systems during execution of programs, PFCDEFAULT controls the number of image pages read from disk per I/O operation when a page fault occurs. The PFCDEFAULT maximum default value is 127 512-byte pages.

On Alpha systems during execution of programs, PFCDEFAULT controls the number of image pagelets read from disk per I/O operation when a page fault occurs. The PFCDEFAULT maximum default value is 2032 512-byte pagelets (127 8192-byte Alpha pages).

The read I/O operations can take place from an image file or from the page file. The actual size of the cluster can be less than PFCDEFAULT, depending on the size of image sections and the pattern of page references.

The value should not be greater than one-fourth the default size of the average working set to prevent a single page fault from displacing a major portion of a working set. Too large a value for PFCDEFAULT can hurt system performance. PFCDEFAULT can be overridden on an image-by-image basis with the CLUSTER option of the OpenVMS linker.

PFRATH (A on Alpha,D,M)

PFRATH specifies the page fault rate above which the limit of a working set will be automatically increased. The unit of measure is the number of faults per 10 seconds of processor time. At a setting of 120, for example, the system will automatically increase the limit of a working set if it is faulting more than 120 pages per 10 seconds. Decreasing the value of this parameter tends to increase the limits of the working sets, while increasing its value tends to decrease their limits.

On VAX systems, the default value is 120 page faults every 10 seconds.

On Alpha systems, the default value is 8 page faults every 10 seconds.

PFRATL (A,D,M)

PFRATL specifies the page fault rate below which the limit of a working set is automatically decreased. The unit of measure is the number of faults per 10 seconds of processor time. At a setting of 1, for example, the system automatically decreases the limit of a working set if it is faulting less than 1 page every 10 seconds.

Increasing the value of this parameter tends to decrease the limits of the working sets, while decreasing its value tends to increase their limits.

PQL_DASTLM (D,G)

PQL_DASTLM sets the default limit on the number of pending ASTs for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DBIOLM (D,G)

PQL_DBIOLM sets the default buffered I/O count limit for the number of outstanding buffered I/O operations permitted to a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DBYTLM (D,G)

PQL_DBYTLM sets the default buffered I/O byte count limit for the amount of buffered space available to a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DCPULM (D,G)

PQL_DCPULM sets the default CPU time limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process). PQL_DCPULM specifies the time limit in increments of 10 milliseconds.

The default value of 0 imposes no limit on CPU time usage and is typically the correct value for this parameter.

PQL_DDIOLM (D,G)

PQL_DDIOLM sets the default direct I/O limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DENQLM (D,G)

PQL_DENQLM sets the default enqueue limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DFILLM (D,G)

PQL_DFILLM sets the default open file limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DJTQUOTA (D)

PQL_DJTQUOTA sets the default job table byte count quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process). PQL_DJTQUOTA specifies the number of bytes of paged pool allocated to the job table. The default value is usually adequate, unless a large number of job logical names or temporary mailboxes are used.

PQL_DPGFLQUOTA (A on VAX,D,G)

PQL_DPGFLQUOTA sets the default page file quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process). Digital recommends that this parameter be no smaller than PQL_DWSEXTENT.

PQL_DPRCLM (D,G)

PQL_DPRCLM sets the default subprocess limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DTQELM (D,G)

PQL_DTQELM sets the default number of timer queue entries for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DWSDEFAULT (A,G)

PQL_DWSDEFAULT sets the default working set size for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DWSEXTENT (A,D,G)

PQL_DWSEXTENT sets the default working set extent for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_DWSQUOTA (A,D,G)

PQL_DWSQUOTA sets the default working set quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MASTLM (D,G)

PQL_MASTLM sets a default limit on the minimum number of pending ASTs for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MBIOLM (D,G)

PQL_MBIOLM sets the minimum buffered I/O limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MBYTLM (D,G)

PQL_MBYTLM sets the minimum buffered I/O byte limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MCPULM (D,G)

PQL_MCPULM sets the minimum CPU time limit in increments of 10 milliseconds for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MDIOLM (D,G)

PQL_MDIOLM sets the minimum direct I/O limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MENQLM (D,G)

PQL_MENQLM sets the default limit on the minimum number of locks that can be queued at one time by a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MFILLM (D,G)

PQL_MFILLM sets the minimum open file limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MJTQUOTA (D)

PQL_MJTQUOTA sets the minimum job table byte count quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MPGFLQUOTA (A on VAX,D,G)

On VAX systems, PQL_MPGFLQUOTA sets the minimum page file quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process). Digital recommends that this parameter be no smaller than PQL_MWSEXTENT.

On Alpha systems, PQL_MPGFLQUOTA sets the minimum pagelet file quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MPRCLM (D,G)

PQL_MPRCLM sets the minimum subprocess limit for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MTQELM (D,G)

PQL_MTQELM sets the minimum number of timer queue entries for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

PQL_MWSDEFAULT (A,G)

PQL_MWSDEFAULT sets the minimum default working set size for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

This value overrides a smaller quantity set for a user in AUTHORIZE.

PQL_MWSEXTENT (A,D,G)

PQL_MWSEXTENT sets the minimum working set extent for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

This value overrides a smaller quantity set for a user in AUTHORIZE.

PQL_MWSQUOTA (A,D,G)

PQL_MWSQUOTA sets the minimum working set quota for a process created by the Create Process ($CREPRC) system service or the DCL command RUN (Process).

This value overrides a smaller quantity set for a user in AUTHORIZE.

PRCPOLINTERVAL (A on Alpha,D)

PRCPOLINTERVAL specifies, in seconds, the polling interval used to look for Systems Communications Services (SCS) applications, such as the connection manager and mass storage control protocol disks, on other nodes. All discovered nodes are polled during each interval.

This parameter trades polling overhead against quick recognition of new systems or servers as they appear.

PROCSECTCNT (A,G)

PROCSECTCNT sets the number of section descriptors that a process can contain. Each section descriptor increases the fixed portion of the process header by 32 bytes.

You should set a value greater than the maximum number of image sections in any section to be run, as indicated by the linkage memory allocation map for the image.

QDSKINTERVAL

QDSKINTERVAL establishes, in seconds, the disk quorum polling interval.

QDSKVOTES

QDSKVOTES specifies the number of votes contributed by a quorum disk in a cluster.

QUANTUM (A on Alpha,D,M)

QUANTUM defines the following:

Processor time---maximum amount of processor time a process can receive before control passes to another process of equal priority that is ready to compute
Balance set residency---minimum amount of service a compute-state process must receive before being swapped out to secondary storage

REALTIME_SPTS (D,G,M)

On VAX systems, REALTIME_SPTS reserves a number of system page table entries for mapping connect-to-interrupt processes into system space. This value should normally remain at the default (0) in an environment that is not real-time. Where connect-to-interrupt processes do use the system, this value should represent the maximum number of pages that all concurrent connect-to-interrupt processes must map into system space. See the OpenVMS VAX Device Support Manual for details. (This manual has been archived but is available in PostScript and DECW$BOOK (Bookreader) formats on the OpenVMS Documentation CD-ROM. A printed book can be ordered through DECdirect (800-354-4825).)

RECNXINTERVAL (A on Alpha,D)

RECNXINTERVAL establishes the polling interval, in seconds, during which to attempt reconnection to a remote system.

RESHASHTBL (A,F,M)

RESHASHTBL defines the number of entries in the lock management resource name hash table. Each entry requires 4 bytes. A typical tuning goal is to have the RESHASHTBL parameter about four times larger than the total number of resources in use on the system. Managers of systems with memory constraints or systems that are not critically dependent on locking speed could set the table to a smaller size.

RJOBLIM (D)

RJOBLIM defines the maximum number of remote terminals allowed in the system at any one time.

RMS_DFMBC (A,D)

RMS_DFMBC specifies a default multiblock count only for record I/O operations, where count is the number of blocks to be allocated for each I/O buffer.