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Although multiple domains can share an EMM server, Symantec does not recommend this configuration. The only situation that merits a shared EMM server is a configuration where multiple NetBackup domains share storage devices. However, there is no performance advantage to this type of configuration.
Care must be taken when you implement a catalog backup and recovery strategy, since all domains create backups of the central EMM database. Restoring any catalog backup can result in inconsistencies in the catalogs of other domains that share the same EMM server.
If you use one EMM domain for multiple master server domains, observe the following:
The EMM should reside on one of the NetBackup master servers. Only one EMM server should exist per EMM domain.
Each master server must be allowed access to the EMM host. Use the Servers host property on the EMM host to allow access.
All names and numbers for devices and all media IDs and bar codes should remain unique across the entire enterprise.