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Use the resourceutilization option in your client options file dsm.opt to regulate the level of resources the Tivoli Storage Manager server and client can use during processing.
When you request a backup or archive, the client can use more than one session to the server. The default is to use a maximum of two sessions; one to query the server and one to send file data. The client can use only one server session if you specify a resourceutilization setting of 1.
A client can use more than the default number of sessions when connecting to a server that is Version 3.7 or higher. For example, resourceutilization=10 permits up to eight sessions with the server. Multiple sessions may be used for querying the server and sending file data.
Multiple query sessions are used when you specify multiple file specifications with a backup or archive command. For example, if you enter:
inc filespaceA filespaceB
and you specify resourceutilization=5, the client may start a second session to query files on file space B. Whether or not the second session starts depends on how long it takes to query the server about files backed up on file space A. The client may also try to read data from the file system and send it to the server on multiple sessions.
When you request a restore, the default is to use a maximum of one session, based on how many tapes the requested data is stored on, how many tape drives are available, and the maximum number of mount points allowed for the node.
Notes:
For example, if the data you want to restore is on 5 different tape volumes, the maximum number of mount points is 5 for your node, and resourceutilization is set to 3, then 3 sessions will be used for the restore. If you increase the resourceutilization setting to 5, then 5 sessions will be used for the restore. There is a 1 to 1 relationship to the number of restore sessions allowed and the resourceutilization setting. Multiple restore sessions are only allowed for no query restore operations.
The following factors can affect the throughput of multiple sessions:
Potentially undesirable aspects of running multiple sessions include:
Notes:
Options File
Place this option in the client options file dsm.opt .
Syntax
>>-RESOURceutilization- number---------------------------------><
Parameters
Examples