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 multimember 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
physically access, 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. Use the SHOW BOOTDEF_DEV and SET BOOTDEF_DEV
console commands to accomplish this task. (For more information,
see
Halt, Boot, and Shutdown Procedures for OpenVMS Alpha Systems.)
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.
HP OpenVMS Version 8.2 Upgrade and Installation... 
Before Upgrading the OpenVMS Alpha Operating System
