Managing SuperCluster Boot Environments
(Doc ID 1526585.1)
Last updated on JUNE 11, 2020
Applies to:SPARC SuperCluster T4-4 - Version All Versions and later
Oracle Solaris on SPARC (64-bit)
Multiple boot environments reduce risk when updating software because system administrators can create backup boot environments before making any software updates to the system. Each time the SuperCluster is patched with the latest QMU (Quarterly Maintenance Update) the maintenance update script will create a new QMU boot environment on each compute and general purpose domain which the administrator will activate during a maintenance window. Obviously if these older environments are not managed it's possible to consume space on the root zpool. To ensure adequate space following each successful upgrade to the latest QMU we would recommend removing older boot environments so the root zpool doesn't run out of space. Before removing anything it's obviously advisable to ensure that you've got a complete backup of the system.
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