Sun Management Center Change Manager 1.0 Administration Guide

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## Solaris Live Upgrade

Solaris Live Upgrade provides a method of upgrading that substantially reduces the usual service outage that is associated with an operating system upgrade. While the active boot environment continues to run, you can install a Solaris Flash archive on the inactive boot environment. The original system configuration remains fully functional and unaffected by the installation of the Solaris Flash archive. When you reboot the system, this boot environment becomes the active boot environment.

If a failure occurs, you have a safety net. You can quickly revert to the original boot environment by performing a fall back. This fall back action eliminates the downtime associated with the normal test and evaluation process.

Change Manager uses Solaris Live Upgrade to perform updates of managed hosts. Before you can perform updates, you must perform an initial installation by using Change Manager. This initial installation must create two boot environments so that an alternate boot environment is available for the update.

For more information about Solaris Live Upgrade, see "Solaris Live Upgrade (Overview)" in Solaris 9 Installation Guide.

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