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. For OpenVMS Alpha systems, use the SHOW BOOTDEF_DEV and SET BOOTDEF_DEV console commands to accomplish this task. (For more information, see Appendix A “Booting and Shutting Down Your OpenVMS Alpha System”.)

For OpenVMS I64 systems, HP recommends using the OpenVMS I64 Boot Manager utility (SYS$MANAGER:BOOT_OPTIONS.COM) 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, see “Setting Boot Options for Your System Disk”.

Creating a Nonshadowed Target Disk

Perform the steps described in this section to change one of your existing shadowed system disks to a nonshadowed disk.

	IMPORTANT: 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.

1. Shut down all systems booted from the shadowed system disk.

2. Perform a conversational (interactive) boot (for OpenVMS Alpha systems, see ; for OpenVMS I64 systems, see “Performing a Conversational (Interactive) Boot”) on the system disk you have chosen for your target disk. For OpenVMS Alpha systems, for example, enter the following command:

   >>> BOOT -FLAGS 0,1 DKA100

   For OpenVMS I64 systems, enter the following command at the EFI Shell prompt, where fsn: is the device associated with the system disk (such as fs1:):

   Shell>fsn:\efi\vms\vms_loader.efi -flags 0,1

3. At the SYSBOOT> prompt, enter the following command to disable volume shadowing of the system disk:

   SYSBOOT> SET SHADOW_SYS_DISK 0

4. Enter the CONTINUE command to resume the boot procedure. For example:

   SYSBOOT> CONTINUE

5. After the boot completes, go to “Finishing Preupgrade Tasks”.

You now have a nonshadowed system disk that you can use for the upgrade.