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

Chapter 2 67
Disk Layout
The VxFS Version 2 Disk Layout
block numbers of the initial inode list extents for the attribute fileset and
indicates which inodes within those initial extents reference the fileset
header file.
Object Location Table Contents
The OLT is composed of records for the following:
Mounting and the Object Location Table
At mount time, the object location table provides essential information
about the location of key file system components. The super-block plays
an important role in locating the OLT, in that it contains pointers to both
the OLT and its replica.
Using the OLT, the process of mounting a VxFS Version 2 file system is:
Step 1. Read in the super-block. Validate the super-block and its replicas
(located in the allocation unit headers).
Step 2. Read and validate the OLT and its replica at the locations recorded in
the super-block.
Step 3. Obtain the addresses of the initial inode list extents for the attribute
fileset from the OLT. Read in these initial inode extents.
Step 4. Find the fileset header file, based on the fileset header file inode number
recorded in the OLT.
Step 5. Read the contents of the fileset header file. Each fileset header file entry
represents a particular fileset and indicates the inode numbers of its
inode list file and IAU file. The attribute fileset is set up first so that
subsequent references to its inode list can be resolved.
fileset header inodes This record identifies the inode numbers of the fileset
header file and its replica.
initial inode list extent
addresses
This record identifies the addresses of the beginning
of each of two 8K inode extents. These are the initial
inode list extents for the attribute fileset, which
contain the inodes for all structural files belonging to
the attribute fileset.
current usage table inode This record identifies the inode number of the file
that contains the current usage table.