IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive ...

Table 37. Client command line informational messages (continued)Informational message MeaningAggregate data transfer rate: The average rate at which Tivoli Storage Manager and the networktransfer data between the client and the server. This is calculated bydividing the total number of bytes transferred by the time that elapsesfrom the beginning to the end of the process. Both Tivoli StorageManager processing and network time are included in the aggregatetransfer rate. Therefore, the aggregate transfer rate is lower than thenetwork transfer rate.Note: On occasion, the aggregate data transfer rate might be higher thanthe network data transfer rate. This is because the backup-archive clientcan have multiple simultaneous sessions with the backup server. If youset the resourceutilization option, Tivoli Storage Manager attempts toimprove performance and load balancing by using multiple sessionswhen it backs up a file space or other set of files. When multiple sessionsare open during backup, the data transfer time represents the sum of thetimes reported by all sessions. In this case, aggregate data transfer time isincorrectly reported as higher. However, when running with a singlesession, the aggregate data transfer rate should always be reported aslower than the network data transfer rate.Objects compressed by: Specifies the percentage of data sent over the network divided by theoriginal size of the file on disk. For example, if the net data-bytes are 10Kand the file is 100K, then Objects compressed by: == (1 - (10240/102400))x 100 == 90%.Elapsed processing time: The active processing time to complete a command. This is calculated bysubtracting the starting time of a command process from the ending timeof the completed command process.Total number of bytes transferred: As indicated.LanFree bytes transferred: The total number of data bytes transferred during a lan-free operation. Ifthe enablelanfree option is set to no, this line will not appear.Backup: Additional considerationsThis section includes topics related to incremental and selective backups. You donot need to understand this information to use Tivoli Storage Manager for basicwork.Understanding how files are storedWhen you back up and archive files, Tivoli Storage Manager stores the backupsand archives in a file space in storage that has the same name as the file system orvirtual mount point from which the files originated.For example, if you have a file system named /home, and you back up a filenamed doc1 in the /home/monnett directory, Tivoli Storage Manager stores thefile in a file space named /home. If an Authorized User later defines/home/monnett as a virtual mount point, any files you back up from the/home/monnett directory, such as doc2, are stored in a file space named/home/monnett. If you enter this command:dsmc query backup "/home/monnett/*"Tivoli Storage Manager looks for files in the /home/monnett file space. It alwayslooks for a file in the file space with the longest name that matches the filespecification you include in a command. It locates the file named doc2 that was114 IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive Clients Installation and User’s Guide