9.3 Modifying a UNIX VOB Host for ClearCase

Each VOB is managed by several server processes, which run on the VOB server host. Because these servers make significant demands on system resources, server configuration is an important contributor to application performance.

UNIX Kernel Resources

You may need to adjust the following kernel resources on a UNIX VOB host:

• Overall process table. The operating system's process table must support 96 or more concurrent user processes. If more than three or four VOBs are to reside on the host, increase the size of the process table to at least 128.

• Overall file descriptor table. The size of the operating system's file descriptor table must be at least 700. If more than three or four VOBs are to reside on the host, increase the size of the file descriptor table.

You may also find it beneficial to adjust kernel resources for the VOB host after ClearCase has been up and running for some time. For more information, see Tune Block Buffer Caches on UNIX.

Optional Software Packages

To ensure correct ClearCase operation, you may need to install one or more optional software packages available from your hardware vendor. For more information, see the Installation Guide for the ClearCase Product Family.