Veritas File System v5.0.1 Administrator's Guide for HP-UX 11i v3 (5900-0082, June 2010)

failure recovery, the VxFS fsck utility performs an intent log replay, which scans
the intent log and nullifies or completes file system operations that were active
when the system failed. The file system can then be mounted without completing
a full structural check of the entire file system. Replaying the intent log may not
completely recover the damaged file system structure if there was a disk hardware
failure; hardware problems may require a complete system check using the fsck
utility provided with VxFS.
See “The log option and data integrity” on page 22.
VxFS 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 for disk layout
Versions 4, 5, and 6 is 16 megabytes. The maximum default intent log size for
disk layout Version 7 is 64 megabytes.
With the Version 6 and 7 disk layouts, you can dynamically increase or decrease
the intent log size using the logsize 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.
Extended mount options
The VxFS file system provides the following enhancements to the mount command:
■ Enhanced data integrity modes
■ Enhanced performance mode
■ Temporary file system mode
■ Improved synchronous writes
■ Support for large file sizes
See “Mounting a VxFS file system” on page 35.
See the mount_vxfs(1M) manual page.
21Introducing Veritas File System
Veritas File System features