Installation and User's Guide

media. Other instances of the same dataare replaced with a pointer to the retainedinstance.data manager serverA server that collects metadatainformation for client inventory andmanages transactions for the storageagent over the local area network. Thedata manager server informs the storageagent with applicable library attributesand the target volume identifier.data moverA device that moves data on behalf of theserver. A network-attached storage (NAS)file server is a data mover.data storage-management applicationprogramminginterface (DSMAPI)A set of functions and semantics that canmonitor events on files, and manage andmaintain the data in a file. In an HSMenvironment, a DSMAPI uses events tonotify data management applicationsabout operations on files, stores arbitraryattribute information with a file, supportsmanaged regions in a file, and usesDSMAPI access rights to control access toa file object.default management classA management class that is assigned to apolicy set. This class is used to governbacked up or archived files when a file isnot explicitly associated with a specificmanagement class through theinclude-exclude list.deduplicationSee data deduplication.demand migrationThe process that is used to respond to anout-of-space condition on a file system forwhich hierarchical storage management(HSM) is active. Files are migrated toserver storage until space usage drops tothe low threshold that was set for the filesystem. If the high threshold and lowthreshold are the same, one file ismigrated.desktop clientThe group of backup-archive clients thatincludes clients on Microsoft Windows,Apple, and Novell NetWare operatingsystems.destinationA copy group or management classattribute that specifies the primary storagepool to which a client file will be backedup, archived, or migrated.device classA named set of characteristics that areapplied to a group of storage devices.Each device class has a unique name andrepresents a device type of disk, file,optical disk, or tape.device configuration file(1) For a server, a file that containsinformation about defined device classes,and, on some servers, defined librariesand drives. The information is a copy ofthe device configuration information inthe database.(2) For a storage agent, a file that containsthe name and password of the storageagent, and information about the serverthat is managing the SAN-attachedlibraries and drives that the storage agentuses.device driverA program that provides an interfacebetween a specific device and theapplication program that uses the device.disaster recovery manager (DRM)A function that assists in preparing andusing a disaster recovery plan file for theserver.disaster recovery planA file that is created by the disasterrecovery manager (DRM) that containsinformation about how to recovercomputer systems if a disaster occurs andscripts that can be run to perform somerecovery tasks. The file includesinformation about the software andhardware that is used by the server, andthe location of recovery media.domainA grouping of client nodes with one ormore policy sets, which manage data orstorage resources for the client nodes. Seepolicy domain or client domain.DRM See disaster recovery manager.DSMAPISee data storage-managementapplication-programming interface.678 IBM Tivoli Storage Manager for Windows Backup-Archive Clients: Installation and User's Guide