Installation and User's Guide - Services and Support

IBM ConfidentialStorage Manager server. Specify this node name with the nodename option in thedsm.opt options file located (by default) in the Data Protection for Exchangeinstallation directory. Note that in order to perform VSS operations, you may needto register node names for additional machines. See “Proxy node definitions (VSSBackups)” for details about this task.Be aware of the following Tivoli Storage Manager parameter conditions whenregistering your Data Protection for Exchange node name (machine) to the TivoliStorage Manager server:v MAXNUMMP This parameter determines the maximum number of mountpoints a client node is allowed to use on the Tivoli Storage Manager serverduring a backup operation.v TXNGroupmax This parameter determines the number of files transferred as agroup between the client and server between transaction commit points. Thisparameter MUST have a value of 12 or greater.v COMPression This parameter determines whether the Data Protection forExchange node compresses data before sending it to the Tivoli Storage Managerserver during a backup operation. Specify COMPression=Client to allow theData Protection for Exchange node to make the decision whether to compressdata via the value of the client COMPRESSIon option specified in the optionsfile (dsm.opt) located in the Data Protection for Exchange directory.Note: If you are running Data Protection for Exchange on a Microsoft ClusterServer, it is recommended that the node name match the Exchange virtual servername.See the IBM Tivoli Storage Manager for Windows Administrator’s Reference forcomplete information regarding these parameters.Proxy node definitions (VSS Backups)Since Data Protection for Exchange VSS Backup operations are implementedthrough the Tivoli Storage Manager backup-archive client, you must use nodenames specifically for VSS operations in addition to using a node name for whereData Protection for Exchange is installed. As part of the configuration procedure, aproxy relationship is defined for these various node names. This proxy relationshipallows node names to perform operations on behalf of another node name. Whenregistering these nodes to the Tivoli Storage Manager server for VSS operations, donot specify the Tivoli Storage Manager USerid=NONE parameter. VSS operationswill fail when this parameter is specified.There are two types of node names defined in proxy node relationships:v Target node: A node name that controls backup and restore operations and thatalso owns the data on the Tivoli Storage Manager server.v Agent node: A node name that performs operations on behalf of a target node.Required node names for basic VSS operationsTo perform basic VSS operations, you must have one target node and one agentnode:Table 13. Required node names for basic VSS operationsProxy node type Nodename Where to specifyTarget node Data Protection for Exchangenode nameUse the nodename option in theData Protection for Exchangeoptions file (dsm.opt)Chapter 3. Configuring Data Protection for Exchange 37