VERITAS File SystemÖ 3.5 (HP OnlineJFS/JFS3.5) AdministratorÆs Guide (December 2002)

Chapter 2

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 43.

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

—qlog

— Combining mount Command Options

• Kernel Tunables

— Internal Inode Table Size

— VxFS Buffer Cache High Water Mark

— VxVM Maximum I/O Size

• Monitoring Free Space

— Monitoring Fragmentation

• I/O Tuning

— Tuning VxFS I/O Parameters

— Tunable VxFS I/O Parameters