Installation manual

Preparing to Upgrade in an OpenVMS Cluster Environment
6.5 Rolling Upgrade
6.5.3 Preparing for a Rolling Upgrade
To prepare for a rolling upgrade, follow these steps:
1. Check the votes and make adjustments to maintain the proper quorum so the
cluster can continue to operate throughout the upgrade. (OpenVMS Cluster
Systems describes this procedure in detail.)
2. Select a system disk to upgrade.
3. Shut down all VAX computers booting from the system disk that you are
upgrading, except for the computer that you will use to apply the upgrade.
VAX computers that do not boot from the system disk that you are upgrading
remain available to users.
a. Log in to the SYSTEM account on the VAX computer you are shutting
down.
b. Enter the following command:
$ @SYS$SYSTEM:SHUTDOWN.COM
c. On one of the VAX computers that is still running, enter the following
command:
$ SET CLUSTER/EXPECTED_VOTES
d. Repeat steps a to c for each VAX computer requiring a shutdown.
This procedure lets one VAX computer continue running from the system
disk (assuming computers running from different system disks supply enough
votes to sustain cluster quorum).
4. If proper quorum is not maintained at any time during the upgrade
procedure, the shutdown procedure will hang the cluster. If the cluster
hangs during a shutdown, enter the following commands on the system
console of a CPU that is still a cluster member:
$
Ctrl/P
>>> H
>>> D/I 14 C
>>> C
IPC> Q
IPC>
Ctrl/Z
5. Upgrade the system disk using the procedure in Chapter 7.
Caution
The upgrade procedure requires exclusive access to the drive that holds
the distribution media. Do not mount the distribution media on other
nodes.
6. During phase 1 of the upgrade, the procedure asks if you are performing a
rolling upgrade. If you enter Y, the procedure asks you several questions
to determine if all system disks in the cluster (other than the one you are
upgrading) are running at least OpenVMS VAX Version 7.1. For example:
* Are the other system disks running OpenVMS V7.1 or higher?
All systems in the cluster must be running at least OpenVMS VAX Version
7.1 to perform the rolling upgrade. Type Y and press Return.
Preparing to Upgrade in an OpenVMS Cluster Environment 6–5