Tuning tips for the file system

Use the following tips to fine-tune your file system:

Make sure that all files in your file system have valid owning UIDs and GIDs. If you restore files from an archive and accidentally keep a UID and GID that were valid on another system, it can create problems that affect response time. For example, say that there is an invalid UID associated with a file. When you use a utility that checks the UID (such as ls -l), RACF® searches the entire database for the UID.
Place HFS data sets on volumes that are cached with DASD Fast Write.
Give each user a separate mountable file system. Doing so enables you to avoid I/O contention by spreading user file systems across multiple DASD devices.
Use the temporary file system (TFS) for /tmp.
Customize the statements in the BXPRMxx member of SYS1.PARMLIB as needed. See Customizing the BPXPRMxx member of SYS1.PARMLIB for guidelines and tips.