Be sure that the administrator doing the upgrade has root access and a working knowledge of UNIX operating system administration.
Complete the following tasks in advance of upgrading:
Check that all terminal emulation issues are worked out. The terminal selected should be fully functional during OpenBoot prompts and single-user and multi-user run levels.
Check the latest Storage Foundation Release Notes to verify that the system meets all the requirements for software and hardware, including any required operating system patches.
Schedule sufficient outage time for the upgrade, and downtime for any applications using the VxFS file systems or VxVM volumes.
If using EMC PowerPath, ensure that you are using at least mandatory patch level 2.0.3.
http://entsupport.symantec.com/docs/234374
The patch level makes changes to /etc/system that prevent panics and failure of vxconfigd. Upgrading PowerPath may require a system reboot.
To reliably save information on a mirrored disk, shut down the system and physically remove the mirrored disk. (This may not be practical, but if done, offers a failback point.)
To upgrade on a remote host, rsh or ssh must be set up.
See Configuring secure shell (ssh) or remote shell before installing products.