11.2  SYSGEN Parameters for SYS$PBDRIVER

  In most cases, the default settings for SYS$PBDRIVER should
  be appropriate, however several SYSGEN parameters are
  provided.  Two SYSGEN parameters control SYS$PBDRIVER:
  SMCI_PORTS and SMCI_FLAGS.

  11.2.1  SMCI_PORTS
  The SMCI_PORTS SYSGEN parameter controls initial load-
  ing of SYS$PBDRIVER. This parameter is a bitmask such
  that the bits 0 through 25 each represent a controller letter.
  If bit 0 is set, PBAx will be loaded.  This is the default setting.

  If bit 1 is set, PBBx will be loaded, and so on all the way up
  to bit 25 will cause PBZx to be loaded.  For OpenVMS Alpha
  Version 7.2, we recommend leaving this parameter at the
  default value of 1.

  Loading additional ports allows for multiple paths between
  Galaxy instances.  For OpenVMS Alpha Version 7.2, having
  multiple communications channels does not provide any ad-
  vantages because SYS$PBDRIVER will initially not support
  Fast Path.  A future release of OpenVMS will provide Fast
  Path support for SYS$PBDRIVER. When Fast Path support
  is enabled, instances with multiple CPUs can get improved
  throughput by having multiple communication channels
  between instances.

  11.2.2  SMCI_FLAGS
  The SMCI_FLAGS SYSGEN parameter controls operational
  aspects of SYS$PBDRIVER. The only currently defined flag
  is bit 1.  This controls whether or not the port device supports
  communications with itself.  Supporting SCS communications
  to itself is primarily used for test purposes.  By default, this bit
  will be turned off and thus support for SCS communication
  locally is disabled which saves system resources.  This pa-
  rameter is dynamic and by turning this bit on, an SCS virtual
  circuit should soon form.

  Bit        Mask      Description

  0         0         0 = Do not create local communications channels
                      (SYSGEN default).  Local SCS communications
                      are primarily used in test situations and not
                      needed for normal operations.  Leaving this bit
                      off saves resources and overhead.  1 = Create
                      local communications channels.

  1         2         0 = Load SYS$PBDRIVER if booting into both a
                      Galaxy and a Cluster (SYSGEN Default).
                      1 = Load SYS$PBDRIVER if booting into a
                      Galaxy.

  2         4         0 = Minimal console output (SYSGEN default)
                      1 = Full console output, SYS$PBDRIVER
                      will display console messages when creating
                      communication channels and tearing down
                      communication channels.