Cisco Cisco Unified IP Interactive Voice Response (IVR) 8.0(1) Administrator's Guide

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Cisco Unified Communications Operating System Administration Guide for Cisco Unifed CCX Release 8.0(1)
Chapter 7      Software Upgrades
  Software Upgrade Considerations
Software Upgrade Considerations
This section contains the following topics:
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Overview of the Software Upgrade Process
Unified CCX 8.0(1) software upgrade process consists of successful installation of the upgrade software 
to the inactive partition followed by the switch version process.
You can install upgrade software on your server while the system continues to operate. Two partitions 
exist on your system: an active, bootable partition and an inactive, bootable partition. The system boots 
up and operates entirely on the partition that is marked as the active partition.
When you install upgrade software, you install the software on the inactive partition. The system 
continues to function normally while you are installing the software. When you are ready, you activate 
the inactive partition and reboot the system with the new upgrade software by running the switch version 
process. The current active partition will then get identified as the inactive partition when the system 
restarts. The current software remains in the inactive partition until the next upgrade. Your configuration 
information migrates automatically to the upgraded version in the active partition.
If for any reason you decide to back out of the upgrade, you can restart the system to the inactive partition 
that contains the older version of the software. However, any configuration changes that you made since 
you upgraded the software will get lost.
You can only make changes to the database on the active partition. The database on the inactive partition 
does not get updated. If you make changes to the database after an upgrade, you must repeat those 
changes after switching the partition. 
You can install a patch or upgrade version from a DVD (local source) or from a network location (remote 
source) that the server can access. While upgrading the Operating System in a single node deployment 
of Unified CCX, you should upgrade the publisher node
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. After the upgrade is complete, initiate switch 
version on the publisher node. Ensure that the publisher comes up successfully after the switch version 
and shows appropriate active and inactive versions.
Caution
In a High Availability (HA) deployment of Unified CCX, you should upgrade both the nodes with 
publisher being the first and then the subscriber. After the upgrade is complete on both the nodes, initiate 
switch version on the Publisher first and after the publisher comes up successfully, initiate switch version 
on the subscriber. Ensure both the publisher and subscriber come up successfully after the switch version 
and shows appropriate active and inactive versions.
Data migration happens only when a switch version is done from a lower to the higher version; when the 
switch version is done from a higher to a lower version the data migration does not happen. 
1. In a single node deployment of Unified CCX, the node will be a publisher node by default.