Veritas File System 5.0 Administrator's Guide (September 2006)

As an example, when mounting the file system, the kernel needs to access the
primary fileset in order to access its inode list, inode allocation unit, quotas file
and so on. The required information is obtained by accessing the fileset header
file from which the kernel can locate the appropriate entry in the file and access
the required information.
Figure C-1
VxFS Version 4 disk layout
Fileset Header File
Initial Inode Extents
Inode List Inode
Fileset Header/
Initial Inode List
....
Object Location Table
....
File Inode Number
Extent Addresses
Inode Allocation
Unit Inode
Fileset Header
File Inode
Structural Fileset
Primary Fileset
Header
Inode List inum
Fileset Index
max_inodes
Features
....
Primary Fileset Header
....
Header
and Name
OLT
Extent
Addresses
OLT Replica
Super-block
VxFS Version 5 disk layout
VxFS disk layout Version 5 is similar to Version 4. Structural files in Version 5
are the same in Version 4. However, the Version 5 disk layout supports file systems
up to 32 terabytes. For a file system to take advantage of VxFS 32-terabyte support,
it must be created on a Veritas Volume Manager volume, and only on a 64-bit
kernel operating system. Files cannot exceed two terabytes in size. For 64-bit
277Disk layout
VxFS Version 5 disk layout