Special case tuning needs

There are circumstances where you will need to tune certain parameters. A common need is the ability to create very large files. A user with appropriate privilege can change the ulimit for the shell process being run by using the ulimit shell command of sh(C), or by modifying the ULIMIT line in the /etc/default/login file. Alternately, you can modify the system SFSZLIM for all users. The SFNOLIM parameter and other commonly encountered limits are summarized in the following table.

Desired Improvement	Parameters
Performance improvement.	Largely automated. Some improvement possible depending on which resources your workload uses. See ``Paging parameters'' and ``Managing system performance''.
Users need to create bigger files.	SFSZLIM, HFSZLIM
Each user needs to open more files.	SFNOLIM, HFNOLIM
Each user needs to run more processes.	MAXUP, NPROC