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Document revision date: 30 March 2001
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OpenVMS System Management Utilities Reference
Manual
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
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.
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.
PSEUDOLOA
(VAX only) PSEUDOLOA specifies (in pages) the size of the PDA0 system
image. PSEUDOLOA is used to boot standalone BACKUP from magnetic tape.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
PU_OPTIONS
PU_OPTIONS is reserved for Compaq use only.
QBUS_MULT_INTR
(VAX only) QBUS_MULT_INTR enables (1) multilevel interrupt dispatching
on systems that use the Q22-bus adapter. Refer to the OpenVMS VAX Device Support Manual
1 for more information about the QBUS_MULT_INTR system
parameter.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
QDSKINTERVAL
QDSKINTERVAL establishes, in seconds, the disk quorum polling interval.
The default value is 3.
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
RAD_SUPPORT (G)
(Alpha only) RAD_SUPPORT enables RAD-aware code to be executed on
systems that support Resource Affinity Domains (RADs); for example,
AlphaServer GS160 systems.
A RAD is a set of hardware components (CPUs, memory, and I/O) with
common access characteristics. For more information about using OpenVMS
RAD features, see the OpenVMS Alpha Galaxy and Partitioning
Guide.
REALTIME_SPTS (D,G,M)
(VAX only) 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 1
RECNXINTERVAL (A on Alpha,D)
RECNXINTERVAL establishes the polling interval, in seconds, during
which to attempt reconnection to a remote system.
RESALLOC
RESALLOC controls whether resource allocation checking is performed.
The default value of 0 disables resource allocation checking.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
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.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with the SHOW RMS_DEFAULT
command.
RMS_DFMBFIDX (A,D)
RMS_DFMBFIDX establishes the default RMS multibuffer count for indexed
sequential disk operations. This value defines the number of I/O
buffers that RMS allocates for each indexed file. For sequential
access, a larger number that allows some of the index buckets to remain
in memory can improve performance.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_DFMBFREL (A,D)
RMS_DFMBFREL establishes the default RMS multibuffer count for relative
disk operations. This value defines the number of I/O buffers that RMS
allocates for each relative file.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_DFMBFSDK (A,D)
RMS_DFMBFSDK establishes the default RMS multibuffer count for
sequential disk operations. This value defines the number of I/O
buffers that RMS allocates for sequential disk files.
The default value is usually adequate. However, if read-ahead or
write-behind operations are used, a larger number improves performance.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_DFMBFSMT (A,D)
RMS_DFMBFSMT establishes the default RMS multibuffer count for magnetic
tape operations. This value defines the number of I/O buffers that RMS
allocates for magnetic tape files.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_DFMBFSUR (A,D)
RMS_DFMBFSUR establishes the default multibuffer count for unit record
devices.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_DFNBC (A,D)
RMS_DFNBC specifies a default block count for network access to remote,
sequential, indexed sequential, and relative files.
The network block count value represents the number of blocks that RMS
is prepared to allocate for the I/O buffers used to transmit and
receive data. The buffer size used for remote file access, however, is
the result of a negotiation between RMS and the remote file access
listener (FAL). The buffer size chosen is the smaller of the two sizes
presented.
Thus, RMS_DFNBC places an upper limit on the network buffer size that
is used. It also places an upper limit on the largest record that can
be transferred to or from a remote file. In other words, the largest
record that can be transferred must be less than or equal to RMS_DFNBC
multiplied by 512 bytes.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_EXTEND_SIZE (D)
RMS_EXTEND_SIZE specifies the number of blocks by which files are
extended as they are written. This number should be chosen to balance
the amount of extra disk space wasted at the ends of each file against
the performance improvement provided by making large extents
infrequently.
When small disk quotas are used, specify a small number such as the
disk cluster size to prevent the user's disk quota from being consumed.
If the value of 0 is used, RMS allocates large extents and truncates
the file back to its actual usage when it closes.
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_FILEPROT
RMS_FILEPROT determines the default file protection for system
processes such as those that create the error log, operator log, and
job controller. It also determines default file protection for
processes created by the job controller (all interactive and batch
processes).
Because a process always inherits its default file protection from its
creator process, RMS_FILEPROT determines default file protection only
for users who do not execute the DCL command SET PROTECTION/DEFAULT in
their login command procedures or during interactive sessions.
The protection is expressed as a mask. (See the discussion of the
$CRMPSC system service in the OpenVMS System Services Reference Manual for more information about
specifying protection masks.) By default, the mask is 64000 (decimal)
or FA00 (hexadecimal), which represents the following protection:
You can set this system parameter with the DCL command SET
RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_DEFAULT.
RMS_PROLOGUE (D)
RMS_PROLOGUE specifies the default prologue RMS uses to create indexed
files. The default value 0 specifies that RMS should determine the
prologue based on characteristics of the file. A value of 2 specifies
Prologue 2 or Prologue 1, and 3 specifies Prologue 3. The RMS prologues
are described in the OpenVMS Record Management Services Reference Manual.
RSRVPAGCNT
RSRVPAGCNT sets the number of pages that are reserved and escrowed for
the current process page file.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
S0_PAGING
S0_PAGING controls paging of system code:
- Setting bit 0 disables paging of all Exec code and data.
- Setting bit 1 disables paging of all RMS code and data.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
S2_SIZE
(Alpha only) S2_SIZE is the number of megabytes to reserve for S2
space. This value does not include the size required for Extended File
Cache (XFC).
SA_APP
SA_APP is a special parameter reserved for Compaq use only.
SAVEDUMP
If the dump file is saved in the page file, SAVEDUMP specifies whether
the page file is saved until the dump file is analyzed. The default
value 0 specifies that the page file should not be retained. A value of
1 specifies that the dump written to the page file should be retained
until either copied or released using the SDA utility.
SBIERRENABLE
(VAX only) This parameter enables (1) SBI error detection and logging.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
SCH_CTLFLAGS (D)
(VAX only) This special parameter is used by Compaq and is subject to
change. Do not change this parameter unless Compaq recommends that you
do so.
The vector scheduling subsystem presently provides an enlarged quantum
to processes requiring vector capability. Customer sites can disable
vector quantum adjustment by setting bit NO_VEC_QUANTADJ (bit 9) in the
system parameter SCH_CTLFLAGS. Setting this bit causes the scheduler to
treat the vector processes and scalar processes uniformly. However,
doing so results in more frequent vector context switches when the
number of vector processes exceeds the number of vector processors in
the system.
SCSBUFFCNT (A,F,G)
On VAX systems, SCSBUFFCNT is the number of buffer descriptors
configured for all SCA. If an SCA device is not configured on your
system, this parameter is ignored. Generally speaking, each data
transfer needs a buffer descriptor and thus the number of buffer
descriptors can be a limit on the number of possible simultaneous I/Os.
Various performance monitors report when a system is out of buffer
descriptors for a given workload which is an indication that a larger
value for SCSBUFFCNT is worth considering. Note that AUTOGEN provides
feedback for this parameter on VAX systems only.
On Alpha systems, the SCS buffers are allocated as needed, and
SCSBUFFCNT is reserved for Compaq use only.
SCSCONNCNT
Beginning with OpenVMS Version 7.2, this parameter is obsolete. SCS
connections are now allocated and expanded only as needed, up to a
limit of 65,000.
SCSFLOWCUSH (D)
Specifies the lower limit for receive buffers at which point SCS starts
to notify the remote SCS of new receive buffers. For each connection,
SCS tracks the number of receive buffers available. SCS communicates
this number to the SCS at the remote end of the connection. However,
SCS does not need to do this for each new receive buffer added.
Instead, SCS notifies the remote SCS of new receive buffers if the
number of receive buffers falls as low as the SCSFLOWCUSH value.
The default value is adequate on most systems. If an SCA port is not
configured on your system, this parameter is ignored.
SCSI_NOAUTO (D)
(VAX only) This special parameter is used by Compaq and is subject to
change. Do not change this parameter unless Compaq recommends that you
do so.
SCSI_NOAUTO prevents the loading of a disk or tape SCSI class driver
for any given device ID in a configuration that includes a SCSI
third-party device. The SCSI_NOAUTO system parameter stores a bit mask
of 32 bits, where the low-order byte corresponds to the first SCSI bus
(PKA0), the second byte corresponds to the second SCSI bus (PKB0), and
so on, as follows:
#31 24 23 16 15 8 7 0
+-------+-------+-------+-------+
| D | C | B | A |
+-------+-------+-------+-------+
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For each SCSI bus, setting the low-order bit inhibits automatic
configuration of the device with SCSI device ID 0; setting the second
low-order bit inhibits automatic configuration of the device with SCSI
device ID 1, and so forth. For instance, the value 00002000_16 prevents
the device with SCSI ID 5 on the bus identified by SCSI port ID B from
being configured. By default, all the bits in the mask are cleared,
allowing all devices to be configured.
SCSICLUSTER_P[1-4]
(Alpha only) SCSICLUSTER_P[1-4] parameters allow non-Compaq peripherals
(CPU-lookalikes) in SCSI clusters.
This special parameter is used by Compaq and is subject to change. Do
not change this parameter unless Compaq recommends that you do so.
SCSMAXDG (G)
This parameter is reserved for Compaq use only.
SCSMAXMSG (G)
This parameter is reserved for Compaq use only.
SCSNODE (A,G)
SCSNODE specifies the name of the computer. This parameter is not
dynamic.
Specify SCSNODE as a string of up to six characters. Enclose the string
in quotation marks.
If the computer is in an OpenVMS Cluster, specify a value that is
unique within the cluster. Do not specify the null string.
If the computer is running DECnet for OpenVMS, the value must be the
same as the DECnet node name.
SCSRESPCNT (A,F,G)
SCSRESPCNT is the total number of response descriptor table entries
(RDTEs) configured for use by all system applications.
If SCA or DSA ports are not configured on your system, the system
ignores SCSRESPCNT.
SCSSYSTEMID (G)
Specifies a number that identifies the computer. This parameter is not
dynamic. SCSSYSTEMID is the low-order 32 bits of the 48-bit system
identification number.
If the computer is in an OpenVMS Cluster, specify a value that is
unique within the cluster. Do not use zero as the value.
If the computer is running DECnet for OpenVMS, calculate the value from
the DECnet address using the following formula:
SCSSYSTEMID = ((DECnet area number) * 1024) + (DECnet node number)
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Example: If the DECnet address is 2.211, calculate the
value as follows:
SCSSYSTEMID = (2 * 1024) + 211 = 2259
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SCSSYSTEMIDH (G)
Specifies the high-order 16 bits of the 48-bit system identification
number. This parameter must be set to 0. It is reserved by Compaq for
future use.
SECURITY_POLICY
SECURITY_POLICY allows a system to run in a C2 or B1 configuration and
to subset out particular pieces of functionality---to exclude
functionality that is outside the evaluated configuration or to
preserve compatibility with previous versions of the operating system.
See the OpenVMS Guide to System Security for further information about the C2 and B1
evaluated configurations.
The following bits are defined:
| Bit |
Description |
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0
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Allows DECwindows to display PostScript extensions
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1
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Allows multiple user names to connect to DECW$SERVER
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2
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Allows unevaluated DECwindows transports (such as TCP/IP)
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3
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Allows $SIGPRC and $PRCTERM to span job trees
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4
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Allows security profile changes to protected objects on a local node
when the object server is absent and cannot update the cluster database
VMS$OBJECTS.DAT
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5
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Allows creation of protected objects on a local node when the object
server is absent and cannot update the cluster database VMS$OBJECTS.DAT
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6
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Allows SPAWN or LIB$SPAWN commands in CAPTIVE accounts
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7
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Allows intrusions on a clusterwide or local basis (If the bit is
cleared, intrusions are clusterwide.)
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The default value of 7 preserves compatibility with existing DECwindows
Motif behavior. A value of 0 disables all unevaluated configurations.
SETTIME
SETTIME enables (1) or disables (0) solicitation of the time of day
each time the system is booted. This parameter should usually be off
(0), so that the system sets the time of day at boot time to the value
of the processor time-of-day register. You can reset the time after the
system is up with the DCL command SET TIME (see the OpenVMS DCL Dictionary).
SHADOWING
SHADOWING enables or disables shadowing and specifies the mode of
shadowing operations that you want to enable. SHADOWING is a value that
specifies the type of disk class driver that is loaded on the system:
DUDRIVER, DSDRIVER, or SHDRIVER. See Volume Shadowing for OpenVMS for more information
about setting system parameters for volume shadowing.
Specify one of the following values:
| Value1 |
Description |
|
0
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No shadowing is enabled; SHDRIVER is not loaded. This is the default
value.
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2
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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.
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1Note that a parameter value of 1 represents Phase I, which
is no longer supported. Instead, use Phase II shadowing.
SHADOW_MAX_COPY (A,D)
Use this parameter for Phase II shadowing only. The value of
SHADOW_MAX_COPY controls how many parallel copy threads are allowed on
a given node.
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_MAX_UNIT
SHADOW_MAX_UNIT specifies the maximum number of shadow sets that can
exist on a node. The setting must be equal to or
greater than the number of shadow sets you plan to have on a
system. Dismounted shadow sets, unused shadow sets, and shadow sets
with no write bitmaps allocated to them are included in the total.
Note
Review this default carefully. The setting must be equal to or
greater than the number of shadow sets you plan to have on a
system. If you attempt to mount more shadow sets than the number
specified by SHADOW_MAX_UNIT, the MOUNT command will fail. Dismounted
shadow sets, unused shadow sets, and shadow sets with no write bitmaps
allocated to them are included in the count for SHADOW_MAX_UNIT.
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This system parameter is not dynamic; that is, a reboot is required
when you change the setting.
The default setting on OpenVMS Alpha systems is 500; on OpenVMS VAX
systems, the default is 100. The minimum value is 10, and the maximum
value is 10,000.
SHADOW_MBR_TMO (D)
SHADOW_MBR_TMO controls the amount of time the system tries to fail
over physical members of a shadow set before removing them from the
set. The SHADOW_MBR_TMO parameter replaces the temporary VMSD3
parameter used in prior releases.
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 120 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
(Alpha only) SHADOW_REMOVE_1 is reserved for Compaq use only.
SHADOW_REMOVE_2
(Alpha only) SHADOW_REMOVE_2 is reserved for Compaq use only.
SHADOW_SYS_DISK
A SHADOW_SYS_DISK parameter value of 1 enables shadowing of the system
disk. A value of 0 disables shadowing of the system disk. The default
value is 0.
Also 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 the OpenVMS System Manager's Manual.
SHADOW_SYS_TMO
The SHADOW_SYS_TMO parameter has the following two distinct uses:
- 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 120 seconds. Change this parameter to a higher
value if you want the system to wait more than the 120-second default
for all members to join the shadow set. You can set the parameter value
to 120 through 65,535 seconds.
SHADOW_SYS_UNIT
Use this parameter for Phase II shadowing only. The SHADOW_SYS_ UNIT
parameter is an integer value that contains the virtual unit number of
the system disk. The default value is 0. The maximum value allowed is
9999. This parameter is effective only when the SHADOW_SYS_DISK
parameter has a value of 1. This parameter should be set to the same
value on all nodes booting off a particular system disk shadow set. See
Volume Shadowing for OpenVMS for more information about setting system parameters for
volume shadowing.
SHADOW_SYS_WAIT
The SHADOW_SYS_WAIT parameter extends the time a booting system waits
for all current members of a mounted shadowed system disk to become
available to this node. The shadow set must already be mounted
by at least one other cluster node for this parameter to take effect.
The default value is 480 seconds. Change this parameter to a higher
value if you want the system to wait more than the 480-second default
for all members to join the shadow set. You can set the parameter value
to 1 through 65,535 seconds.
SMCI_FLAGS (D)
(Alpha Galaxy platforms only) The SMCI_FLAGS parameter controls
operational aspects of SYS$PBDRIVER, the Galaxy Shared Memory Cluster
Interconnect (SMCI).
Bits in the bit mask are the following:
| Bit |
Mask |
Description |
|
0
|
0
|
0 =
|
Do not create local communications channels (SYSGEN default). Local SCS
communications are primarily used in test situations and are not needed
for normal operations. Not creating local communications saves
resources and overhead.
|
|
|
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1 =
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Create local communications channels.
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1
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2
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0 =
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Load SYS$PBDRIVER if booting into both a Galaxy and a Cluster (SYSGEN
Default).
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|
|
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1 =
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Load SYS$PBDRIVER if booting into a Galaxy.
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2
|
4
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0 =
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Minimal console output (SYSGEN default).
|
|
|
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1 =
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Full console output; SYS$PBDRIVER displays console messages when it
creates and tears down communications channels.
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SMCI_PORTS
(Alpha Galaxy platforms only) The Shared Memory Cluster Interconnect
(SMCI) system parameter SMCI_PORTS controls initial loading of
SYS$PBDRIVER. This parameter is a bit mask; bits 0 through 25 each
represent a controller letter. If bit 0 is set, which is the default
setting, PBAx is loaded (where x represents the Galaxy
Partition ID). If bit 1 is set, PBBx is loaded, and so on up to bit 25,
which causes PBZx to be loaded. For OpenVMS Alpha Version 7.2, Compaq
recommends leaving this parameter at the default value of 1.
Loading additional ports allows multiple paths between Galaxy
instances. In the initial release of the Galaxy software, having
multiple communications channels is not an advantage because
SYS$PBDRIVER does not support fast path. A future release of OpenVMS
will provide Fast Path support for SYS$PBDRIVER, when multiple CPUs
improve throughput by providing multiple communications channels
between instances.
SMP_CPUS
SMP_CPUS identifies which secondary processors, if available, are to be
booted into the multiprocessing system at boot time. SMP_CPUS is a
32-bit mask; if the value of a bit in the mask is 1, the processor with
the corresponding CPU ID is booted into the multiprocessing system (if
it is available). For example, if you want to boot only the CPUs with
CPU IDs 0 and 1, specify the value 3 (both bits are on).
Note
1 This manual has been archived but is
available on the OpenVMS Documentation CD-ROM.
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