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This document provides procedures for performing a high availability upgrade to Cisco Unified Communications Manager (Unified Communications Manager) Release 9.1(x) from the following releases:

• Releases 6.1(2) through 6.1(5) • Releases 7.0(1) through 7.1(3) • Release 8.0(1)

About high availability upgrades

Perform the upgrade in three stages:

1 Upgrade to Unified Communications Manager Release 8.0(3).

2 Virtualize Unified Communications Manager Release 8.0(3).

3 Upgrade to Unified Communications Manager Release 9.1(x).

The procedures in this document support high availability for all three stages of the upgrade.

This document is applicable to Unified Communications Manager clusters with the following environment:

• Any of the following Unified Communications Manager Releases are installed: 6.1(2) through 6.1(5), 7.0(1) through 7.1(3), or 8.0(1).

• None of the current Media Convergence Server (MCS) servers support Unified Communications Manager Release 9.1(x).

• All of the current MCS servers can support an upgrade to Unified Communications Manager Release 8.0(3).

• You require high availability during the upgrade process.

• No changes are required to the IP addresses or hostnames for the Unified Communications Manager upgrade. If you need to change IP addresses or hostnames, you must do so in a separate maintenance window, prior to the upgrade. For more information, see Changing the IP Address and Hostname for Cisco Unified Communications Manager, Release 9.1(1).

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