Set System Parameters for Volume Shadowing
(New Installations Only; Optional)
If you plan to form a shadowed system disk, you must add system
parameters to the SYS$SYSTEM:MODPARAMS.DAT file. Add the following
lines to the bottom of the MODPARAMS.DAT file:
SHADOWING=2
!Enable volume shadowing SHADOW_SYS_DISK=1
!Enable shadowing of the system disk SHADOW_SYS_UNIT=n !Optional: default is 0, which creates DSA0 SHADOW_MAX_COPY=4
!Allow up to 4 shadow copies or merges going on at the same
time ALLOCLASS=x !This number must be non-zero and unique
per node in the cluster; !it must
be used if local non-FC devices are going to be
!shadow set members
In an OpenVMS Cluster, specify a unique ALLOCLASS value for
each node. If a non-zero ALLOCLASS value is already in use for
your system, do NOT change the ALLOCLASS value. For more information
about these and other system parameters you can set for volume shadowing,
refer to the HP Volume Shadowing for OpenVMS
guide. For more
information about setting ALLOCLASS for clusters, refer to the HP OpenVMS Cluster Systems
manual.
After you have modified the MODPARAMS.DAT file as recommended,
perform an AUTOGEN and reboot as follows:
Run AUTOGEN by entering the following command:
$@SYS$UPDATE:AUTOGEN GETDATA TESTFILES NOFEEDBACK
After AUTOGEN completes,
display or print the SYS$SYSTEM:AGEN$PARAMS.REPORT file and review
it. This file lists changes being made to SYSGEN parameters or
changes that AUTOGEN wanted to make but could not because of a hardcoded
or minimum value that was specified in MODPARAMS.DAT.
If other changes need to
be made to MODPARAMS.DAT based on a review of the AGEN$PARAMS.REPORT
file, make them now and then resume at step 1.
Once you are satisfied with
the parameter settings, enter the following AUTOGEN command:
$@SYS$UPDATE:AUTOGEN GENPARAMS REBOOT NOFEEDBACK
This command makes the parameter changes permanent so that
they are used on subsequent reboots. The system will shut down and
reboot automatically.
HP OpenVMS Version 8.2-1 for Integrity Servers... 
After Installing or Upgrading the OpenVMS Operating... 
