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

Chapter 2 69
Disk Layout
The VxFS Version 3 Disk Layout
known, the label file can be used to
locate super-block copies if there is
structural damage to the file system.
device file Records device information such as
volume length and volume label, and
contains pointers to other structural
files.
fileset header file Holds information on a per-fileset
basis. This may include the inode of
the fileset's inode list file, the
maximum number of inodes allowed,
an indication of whether the file
system supports large files, and the
inode number of the quotas file if the
fileset supports quotas. When a file
system is created, there are two
filesets—the
structural fileset
defines the file system structure, the
primary fileset
contains user
data.
inode list file Both the primary fileset and the
structural fileset have their own set
of inodes stored in an inode list file.
Only the inodes in the primary fileset
are visible to users. When the
number of inodes is increased, the
kernel increases the size of the inode
list file.
inode allocation unit file Holds the free inode map, extended
operations map, and a summary of
inode resources.
log file Maps the block used by the file
system intent log.
extent allocation unit state file Indicates the allocation state of each
AU by defining whether each AU is
free, allocated as a whole (no bitmaps
allocated), or expanded, in which case
the bitmaps associated with each AU
determine which extents are