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Upgrading CMS to the High Availability Option
CentreVu
CMS R3V8 High Availability
Connectivity, Upgrade and Administration
HA Upgrade Scenarios 3-2
If either case a) or b) are in effect, the upgrade process is significantly
simplified, since:
• the Definity switch can be administered for the correct CMS version
and the dual ACD links prior to the arrival of the new HA server
onsite (the unused C-LAN link is busied out until the new HA server
is installed)
• the original server either does not require a software upgrade or
only needs a base load upgrade to match the installation on the new
HA server.
In either case, when a new HA server is added to a system in which the
original server is already installed with the correct CMS version,
achievement of a “synchronized” system requires minimal or no software
installation, followed by one or two maintenance backups and restores
between the two servers (the servers are never truly synchronized due to
operational differences between the primary and secondary servers).
Due to the simplified logistics associated with creation of a new HA
system when the original server is already installed with the correct
CMS version, this document does not describe upgrade scenarios
in which a full CMS version upgrade is not required.
In contrast, when the original server is installed with a pre-R3V8 version
of the CMS software, the HA upgrade process entails a specific
sequence of installation and administration activities, as well as various
maintenance backups, data migrations and restores. These activities
must be executed in an ordered sequence that minimizes system
downtime and the overall provisioning effort. The procedures required to
perform an HA upgrade under this scenario are presented in the following
sections.