About the Enterprise Media Manager (EMM)
The Enterprise Media Manager (EMM) is a NetBackup service that manages the device and the media information for NetBackup. The Enterprise Media Manager stores its managed information in a database that resides on the master server. The NetBackup Resource Broker queries EMM to allocate storage units, drives (including drive paths), and media.
EMM contains the following information:
Device attributes
Robotic library and standalone drive residence attributes
NDMP attributes
Barcode rule attributes
Volume pool attributes
Tape attributes
Media attributes
Storage unit attributes
Storage unit group attributes
Hosts with assigned tape drives
Media and device errors
Disk pool and disk volume attributes
Storage server attributes
Log on credentials for storage servers, disk arrays, and NDMP hosts
Fibre Transport attributes
EMM ensures consistency between drives, robotic libraries, storage units, media, and volume pools across multiple servers. EMM contains information for all media servers that share devices in a multiple server configuration.
The NetBackup scheduling components use EMM information to select the server, drive path, and media for jobs. When the device manager ltid starts up, it reads device information from EMM into a shared memory segment. Components on the same host communicate by using shared memory IPC or socket protocols. Socket protocols are used between components across multiple hosts. Command line interfaces are available to obtain run-time (shared memory) information and static device configuration information.
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