VERITAS File System 4.1 Administrator's Guide

The VERITAS File System
Fast File System Recovery
Chapter 1 21
Intent Log Resizing
The VxFS intent log is allocated when the file system is first created. The size of the intent log
is based on the size of the file system-the larger the file system, the larger the intent log. The
maximum default intent log size of disk layout Versions 4, 5 and 6 is 16 megabytes.
With the Version 6 disk layout, you can dynamically increase or decrease the intent log size
using the log option of the fsadm command. Increasing the size of the intent log can
improve system performance because it reduces the number of times the log wraps around.
However, increasing the intent log size can lead to greater times required for a log replay if
there is a system failure.
NOTE Inappropriate sizing of the intent log can have a negative impact on system
performance.
See the mkfs_vxfs(1M) and the fsadm_vxfs(1M) manual pages for more information on
intent log size.