Live Upgrade is a feature in Solaris operating system that allows the operating system to be cloned to an offline slice (or slices), which can then be upgraded with new OS patches, software, or even a new version of Solaris operating system.
The system administrator can then reboot the system on the newly upgraded OS slice. In case of any issues in the newly upgraded OS, it is easy to revert back to the original slice / OS version via a single live upgrade command followed by a reboot.
This is how Solaris live upgrade works, Live Upgrade requires you to have multiple slices on your boot drive - one set of slices is "active" and the other is "inactive". These sets of slices are known as "boot environments", or BE's.
The # lucreate command is used to create and initially populate the secondary slices (s).
The # lumake command can be used to subsequently populate (clone) a boot environment.
The # luactivate is used to choose which boot environment should be active upon next reboot.
Finally, the # lumount command can be used to mount live upgrade slices / boot environments, so that they can be patched or otherwise upgraded.
The system administrator can then reboot the system on the newly upgraded OS slice. In case of any issues in the newly upgraded OS, it is easy to revert back to the original slice / OS version via a single live upgrade command followed by a reboot.
This is how Solaris live upgrade works, Live Upgrade requires you to have multiple slices on your boot drive - one set of slices is "active" and the other is "inactive". These sets of slices are known as "boot environments", or BE's.
The # lucreate command is used to create and initially populate the secondary slices (s).
The # lumake command can be used to subsequently populate (clone) a boot environment.
The # luactivate is used to choose which boot environment should be active upon next reboot.
Finally, the # lumount command can be used to mount live upgrade slices / boot environments, so that they can be patched or otherwise upgraded.
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