HP OpenVMS 8.x manual IPC Ctrl/Z

6.Use the following command to shut down any nodes that boot from the system disk you are upgrading (shut down satellite nodes first):

$ @SYS$SYSTEM:SHUTDOWN

a.When the procedure asks whether an automatic system reboot should be performed, enter N (NO).

b.Choose the REMOVE_NODE option.

If a proper quorum is not maintained at any time during the upgrade procedure, the shutdown procedure hangs the cluster. If the cluster hangs during a shutdown, you can use the Interrupt Priority C (IPC) facility to adjust quorum from the system console of a system that is still a cluster member.

From an OpenVMS Alpha cluster member, press Ctrl/P. The IPC facility displays help information about IPC commands. Enter the commands at the console:

$ Ctrl/P

>>>D SIRR C

>>>C

Interrupt Priority C

Commands:
C device	Cancel Mount Verification
Q	Adjust Quorum
CTRL-Z	Exit IPC
CTRL-P	Prompt for Crash
IPC> Q
IPC> Ctrl/Z

From an OpenVMS I64 cluster member, pressing Ctrl/P puts the system directly into the IPC facility, which displays help information about IPC commands. To adjust quorum, enter the commands shown in the following example. Note that if systems are booted with XDELTA, pressing Ctrl/P brings the OpenVMS I64 system into XDELTA. The IPC facility is not available in this case.

$ Ctrl/P

Interrupt Priority C

Commands:
C device	Cancel Mount Verification
Q	Adjust Quorum
CTRL-Z	Exit IPC
CTRL-P	Prompt for Crash
IPC> Q
IPC> Ctrl/Z

You can also adjust quorum using Availability Manager or DECamds. The method is equivalent to that used by IPC except you do not have to use the console (this assumes the Data Analyzer is running on a system outside the OpenVMS Cluster, which is recommended). For more information, see the “Adjust Quorum” section in the Availability Manager User’s Guide or the DECamds User’s Guide. The Availability Manager User’s Guide is available at:

http://www.hp.com/products/openvms/availabilitymanager

92 Preparing to Upgrade in an OpenVMS Cluster Environment