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| Planning for a phased upgrade | ||
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Plan out the movement of the service groups from node-to-node to minimize the downtime for any particular service group.
Some rough guidelines follow:
Split the cluster into two subclusters of equal or near equal size.
Split the cluster so that your high priority service groups remain online during the upgrade of the first subcluster.
Before you start the upgrade, back up the VCS configuration files main.cf and types.cf which are in the /etc/VRTSvcs/conf/config/ directory.
Before you start the upgrade make sure that all the disk groups have the latest backup of configuration files in the /etc/vx/cbr/bk directory. If not, then run the following command to take the latest backup.
# /etc/vx/bin/vxconfigbackup -| [dir] [dgname|dgid]