ZFS Patching with Zones using LU (Liveupgrade) in Solaris.
SOLARIS LIVE UPGRADE:
Solaris Live Upgrade software enables the operating system to continue to run while upgrades, patch installations, or routine maintenance operations are performed. System administrators can patch a system image rapidly without impacting the boot environment needed by the Solaris OS to run. Administrators simply create a copy of the active boot environment, make changes to the copy, and reboot to the updated boot environment when appropriate. In the event of a problem, administrators can revert to a previous environment with a simple reboot. The result a simplified way to update systems that minimizes the downtime and risk often associated with patching efforts.
ZFS Patching + Zones with Liveupgrade:
We have performed patching for Solaris OS under ZFS with Zones using Live upgrade successfully without any downtime of the box. We have done this using traditional patching method i.e downloaded patchbundle from Oracle site and placed that in the server. Full Story