NetBackup-Java Performance Improvement Hints

Performance of the NetBackup-Java applications depends on the environment where the applications are running. The default configuration of NetBackup-Java, specifically the INITIAL_MEMORY and MAX_MEMORY nbj.conf options, assumes sufficient memory resources on the machine you execute the jnbSA or jbpSA commands. Following are guidelines for improving performance:

• Run NetBackup-Java on a 512 MB machine that has at least 128 MB of RAM available to the application. In some instances, the application does not even initiate due to insufficient memory. These failures can be identified by a variety of messages in the xterm window where the jnbSA command was executed or the application log file. Possible messages include:

Error occurred during initialization of VM

Could not reserve enough space for object heap

Out of Memory

For more information, refer to the conf options INITIAL_MEMORY, MAX_MEMORY.

• Increasing the amount of swap space available to the system where you are running the applications can increase performance, especially if there is a great deal of other activity on the machine. Increasing the amount of swap space can also alleviate hangs or other problems related to insufficient memory for the applications.
• Run NetBackup-Java on a machine that has a low level of activity. For example, there can be dramatic differences in reponse time when other memory-intensive applications are running on the machine. (For example, Web browsers.) Multiple instances of NetBackup-Java on the same machine have the same effect.
• Since startup of the Java virtual machine and some applications can take longer than others, leaving NetBackup-Java running (iconified) rather than exiting and restarting is beneficial.