MSCP_SERVE_ALL

   MSCP_SERVE_ALL is a bit mask that controls disk serving in an
   OpenVMS Cluster. A disk is served regardless of its allocation
   class unless bit 3 has a value of 1.

   Starting with OpenVMS Version 7.2, the serving types are
   implemented as a bit mask. To specify the type of serving your
   system will perform, locate the type you want in the following
   table and specify its value. For some systems, you may want to
   specify two serving types, such as serving the system disk and
   serving locally attached disks. To specify such a combination,
   add the values of each type, and specify the sum.

   In a mixed-version cluster that includes any systems running
   OpenVMS Version 7.1-x or earlier, serving all available disks
   is restricted to serving all disks except those whose allocation
   class does not match the system's node allocation class (prior
   to Version 7.2). To specify this type of serving, use the value 9
   (which sets bit 0 and bit 3).

   The following table describes the serving type controlled by each
   bit and its decimal value:

   Bit and
   Value
   When Set      Description

   Bit 0 (1)     Serve all available disks (locally attached and
                 those connected to HSx and DSSI controllers).
                 Disks with allocation classes that differ from
                 the system's allocation class (set by the ALLOCLASS
                 parameter) are also served if bit 3 is not set.

   Bit 1 (2)     Serve locally attached (non-HSx and DSSI) disks.

   Bit 2 (4)     Serve the system disk. This is the default setting.
                 This setting is important when other nodes in the
                 cluster rely on this system being able to serve
                 its system disk. This setting prevents obscure
                 contention problems that can occur when a system
                 attempts to complete I/O to a remote system disk
                 whose system has failed.

   Bit 3 (8)     Restrict the serving specified by bit 0. All disks
                 except those with allocation classes that differ
                 from the system's allocation class (set by the
                 ALLOCLASS parameter) are served.

                 This is pre-Version 7.2 behavior. If your cluster
                 includes systems running OpenVMS 7.1-x or earlier,
                 and you want to serve all available disks, you must
                 specify 9, the result of setting this bit and bit
                 0.

   Although the serving types are now implemented as a bit mask, the
   values of 0, 1, and 2, specified by bit 0 and bit 1, retain their
   original meanings:

      0 - Do not serve any disks (the default for earlier versions
      of OpenVMS).

      1 - Serve all available disks.


      2 - Serve only locally attached (non-HSx and non-DSSI) disks.

   If the MSCP_LOAD system parameter is 0, MSCP_SERVE_ALL is
   ignored.