HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide

42 Chapter2
Disk Layout
Introduction
Introduction
Three disk layouts are available with the VxFS file system:
NOTE The Version 1 disk layout is not supported on HP-UX.
The following topics are covered in this chapter:
• “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 3 Disk Layout”
• “The VxFS Version 4 Disk Layout”
When HP-UX 11.1x is installed on a system, new VxFS file systems are
created with the Version 4 layout by default. When JFS 3.3 is installed
on an HP-UX 11.00 system, new file systems are created with the
Version 3 layout by default. Although mkfs allows the user to specify
Version 2 The Version 2 disk layout was designed to support features such
as filesets, dynamic inode allocation, and enhanced security.
Version 3 The Version 3 disk layout encompasses all file system structural
information in files, rather than at fixed locations on disk,
allowing for greater scalability. Version 3 supports files and file
systems up to one terabyte in size.
Version 4 The Version 4 disk layout supports access control lists (ACLs).