Multi Instancing

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Overview

How to Use Multi Instancing


Overview

Using the Multi Instancing feature, the same Agent and MediaAgent software can be installed on a computer multiple times; the resultant multiple instances of a particular software component can operate simultaneously on the computer, independent from each other.

Each instance consists of the following:

Some of the circumstances where this feature will prove useful are illustrated by the following:

This illustrates just two possible uses; there will certainly be other cases where Multi Instancing will prove useful in an enterprise.

Support

WARNING

For these iDataAgents, ensure that there is no overlapping subclient content across instances before commencing data protection operations:

  • Exchange Database iDataAgent
  • Informix iDataAgent
  • Oracle iDataAgent
  • SharePoint Server iDataAgent
  • Sybase iDataAgent

General Information

Agent Specific Information

Network Port Requirements

Clusters

For more information about clusters, see Clustering Support.


How to Use Multi Instancing

This section details the steps for using Multi Instancing.

Install

  1. Verify that the selected computer meets the necessary System Requirements. Refer to System Requirements, and select the page for the software component(s) you are installing.
  2. To allow Multi Instancing, for Windows configure the bAllowMultiInstances registry key, or for UNIX configure the cvpkgadd_unlock_inst key.
  3. Install software on the computer for the first instance; refer to Installation, and select the page for the software you are installing. If the computer already has an instance installed, proceed to the next Step.
  4. Install software on the computer for the next instance.
  5. When you are done, the computer will appear in the CommCell Browser as either a client of each of the CommServes with which the instances are associated, with a list of Agents that were installed for that instance, or it will appear as a MediaAgent.

Upgrade

When upgrading a CommCell with multiple instances on the same computer, each instance is upgraded individually.

Uninstall

When uninstalling components which have been Multi Instanced, each instance of a given Agent or MediaAgent will be shown separately, either in the Add/Remove Control Panel (Windows) or in the Uninstall menu (Unix) so you can select the one you want to uninstall. Once uninstalled, the license will be released, and the CommCell Browser will indicate it is no longer installed, but the binaries are not actually removed until the last component using them is uninstalled. (Remember that if you have multiple instances of the Windows File System iDataAgent, for example, the binaries are only installed once, for all instances.) For more information about uninstalling software components, see Uninstalling Components.

Considerations


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