VxFS System Administrator's Guide

Preface

Audience

Scope

Organization

Using This Guide

Conventions

Getting Help

The VERITAS File System

Introduction

VxFS Features

Disk Layout Options

File System Performance Enhancements

Extent Based Allocation

Typed Extents

Extent Attributes

Fast File System Recovery

Enhanced Security

Online System Administration

Defragmentation

Resizing

Online Backup

Application Interface

Application Transparency

Expanded Application Facilities

Extended mount Options

Enhanced Data Integrity Modes

Enhanced Performance Mode

Temporary File System Modes

Improved Synchronous Writes

Enhanced I/O Performance

Enhanced I/O Clustering

VxVM Integration

Quotas

Support for Large Files

Disk Layout

Introduction

Disk Space Allocation

The VxFS Version 1 Disk Layout

Overview

Super-Block

Intent Log

Allocation Unit

The VxFS Version 2 Disk Layout

Overview

Basic Layout

Filesets and Structural Files

Locating Dynamic Structures

The VxFS Version 4 Disk Layout

Extent Attributes

Introduction

Attribute Specifics

Reservation: Preallocating Space to a File

Fixed Extent Size

Other Controls

Commands Related to Extent Attributes

Failure to Preserve Extent Attributes

Online Backup

Introduction

Snapshot File Systems

Snapshot File System Disk Structure

How a Snapshot File System Works

Using a Snapshot File System for Backup

Creating a Snapshot File System

Making a Backup

Performance of Snapshot File Systems

Performance and Tuning

Introduction

Choosing a Block Size

Choosing an Intent Log Size

Choosing Mount Options

log

delaylog

tmplog

nolog

nodatainlog

blkclear

mincache

convosync

Combining mount Options

Kernel Tuneables

Internal Inode Table Size

VxVM Maximum I/O Size

Monitoring Free Space

Monitoring Fragmentation

I/O Tuning

Tuning VxFS I/O Parameters

Tuneable VxFS I/O Parameters

Application Interface

Introduction

Cache Advisories

Direct I/O

Unbuffered I/O

Discovered Direct I/O

Data Synchronous I/O

Other Advisories

Extent Information

Space Reservation

Fixed Extent Sizes

Freeze and Thaw

Get I/O Parameters ioctl

Quotas

Introduction

Quota Limits

Quotas File on VxFS

Quota commands

quotacheck With VxFS

Using Quotas

Kernel Messages

Introduction

File System Response to Problems

Marking an Inode Bad

Disabling Transactions

Disabling the File System

Recovering a Disabled File System

Kernel Messages

Global Message IDs

Glossary

Index