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

lanfreeshmportSpecifies the unique number that is used by the client and the storage agent toidentify shared memory area used for communications. See “Lanfreeshmport”on page 340 for more information.lanfreetcpportSpecifies the TCP/IP port number where the Storage Agent is listening. See“Lanfreetcpport” on page 341 for more information.lanfreetcpserveraddressSpecifies the TCP/IP address for the Tivoli Storage Manager storage agent.Configure memory-constrained systems to run incrementalbackupsIncremental backup performance suffers if the system has a low amount ofmemory available before starting the backup.If your system is memory constrained, specify the memoryefficientbackup yesoption in your client options file. This option causes Tivoli Storage Manager toprocess only one directory at a time, which reduces memory consumption butincreases backup time. When you specify yes, Tivoli Storage Manager analyzes onlyone directory at a time for backup consideration. If performance remains poor,check your communication buffer settings and the communication link betweenyour system and the Tivoli Storage Manager server. If your system is not memoryconstrained, setting the memoryefficientbackup option to yes will degrade yourbackup performance.Related reference“Memoryefficientbackup” on page 348The memoryefficientbackup option specifies the memory-conserving algorithm touse for processing full file space backups. One method backs up one directory at atime, using less memory. The other method uses much less memory, but requiresmore disk space.Configure systems with large numbers of files to runincremental backupsThe client can use very large amounts of memory to perform incremental backupoperations, especially on file systems that contain large numbers of files. The term″memory″ as used here is the addressable memory available to the client process.Addressable memory is a combination of physical RAM and virtual memory.On average, the client uses approximately 300 bytes of memory per object (file ordirectory). Thus for a file system with one million files and directories, the TivoliStorage Manager client will require, on average, approximately 300 MB of memory.The exact amount of memory used per object will vary, depending on the length ofthe object path and name length, or the nesting depth of directories. The numberof bytes of data is not an important factor in determining the Tivoli StorageManager backup client memory requirement.The maximum number of files can be determined by dividing the maximumamount of memory available to a process by the average amount of memoryneeded per object.The total memory requirement can be reduced by any of the following methods:v Use the client option memoryefficientbackup diskcachemethod. This choice reducesthe use of memory to a minimum at the expense of performance and a108 IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive Clients Version 6.1: Installation and User’s Guide