VERITAS File System 3.5 (HP OnlineJFS/JFS 3.5) Administrator's Guide (August 2003)

Chapter 2
29
2 VxFS Performance: Creating, Mounting, and
Tuning File Systems
Introduction
For any file system, the ability to provide peak performance is important. Adjusting the available VERITAS
File System (VxFS) options provides a way to increase system performance. This chapter describes the
commands and practices you can use to optimize VxFS. For information on optimizing an application for use
with VxFS, see “Application Interface” on page 55.
The following topics are covered in this chapter:
• Choosing mkfs Command Options
— Block Size
— Intent Log Size
• Choosing mount Command Options
— log
— delaylog
— tmplog
— logiosize
— nodatainlog
— blkclear
— mincache
— convosync
— ioerror
— largefiles | nolargefiles
— tranflush
— Combining mount Command Options
• Kernel Tunables
— Internal Inode Table Size
— VxFS Buffer Cache High Water Mark
— Number of Links to a File
— VxFS Inode Free Time Lag
— VxVM Maximum I/O Size
• Monitoring Free Space
— Monitoring Fragmentation
• I/O Tuning
— Tuning VxFS I/O Parameters
— Tunable VxFS I/O Parameters