Upgrading the Operating System
The choice of doing an OS upgrade versus doing a complete reinstallation will be determined by your application and the uptime requirements of the services hosted by the system.
In general, using Live Upgrade (LU) makes system upgrades a straightforward task with no downtime required other than the time needed to reboot into the upgraded boot environment. LU is recommended for upgrading systems, regardless of their use of a logical volume manager. LU also provides the rudiments of change control, including documentation of what changed and a back-out plan in case of unforeseen problems with the upgraded boot image.
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