Because you cannot
upgrade the operating system on a shadowed system disk (the upgrade
will fail), you need to disable shadowing of the system disk and
perform other operations before you can upgrade the operating system.
There are several methods for creating a nonshadowed target
disk. This chapter describes how to change one of your existing shadowed
system disks in a multiple-member shadow set to a nonshadowed disk
that you can use as your target disk for the upgrade.
If you have a larger configuration with disks that you can
access physically, you might want to use a copy of the
system disk as your target disk. HP Volume Shadowing for OpenVMS
describes
two methods you can use to create this copy (using volume shadowing
commands or BACKUP commands) and how to disable volume shadowing.
Setting the Boot
Device Be sure your system is set to boot by default from the disk
you intend to upgrade. HP recommends using the the OpenVMS I64
Boot Manager (BOOT_OPTIONS.COM) utility to add shadowed system disks
in a multiple-member shadow set to the EFI boot device list and
dump device list. Be sure to add all members to both lists. For
more information about setting boot options and using this utility, refer
to
Setting Boot Options for Your System Disk.
Creating a Nonshadowed
Target Disk Follow the procedure described in this section to change one
of your existing shadowed system disks to a nonshadowed disk.
If you simply use a MOUNT/OVERRIDE=SHADOW_MEMBERSHIP
command to mount the volume to be upgraded, volume shadowing can
overwrite the newly upgraded disk with information from a prior
volume that has not been upgraded.
Shut down all
systems booted from the shadowed system disk.
Perform a conversational (interactive) boot (refer
to
Performing a Conversational (Interactive) Boot) on the system
disk you have chosen for your target disk. For example, at the
EFI Shell prompt, enter the following command, where fsn:
is the device associated with the system disk (such as fs1:):
Shell>fsn:\efi\vms\vms_loader.efi -flags 0,1
At the SYSBOOT> prompt, enter the following
command to disable volume shadowing of the system disk:
SYSBOOT>SET SHADOW_SYS_DISK 0
Enter the CONTINUE command to resume the boot procedure.
For example:
SYSBOOT>CONTINUE
After the boot completes, log in to the system.
You now have a nonshadowed system disk that you can use for
the upgrade.
HP OpenVMS Version 8.2-1 for Integrity Servers... 
Before Upgrading the OpenVMS Operating System
