HP-UX 11i Version 2 Release Notes (October 2003)

Disk and File Management
VERITAS File System (VxFS) 3.5
Chapter 5
117
VERITAS File System (VxFS) 3.5
The VERITAS File System 3.5 (HP OnlineJFS/JFS 3.5) product is an extent-based,
intent-logging file system. This product is particularly geared toward UNIX
environments that require high performance and availability, and that deal with large
volumes of data. The VERITAS File System 3.5 (HP OnlineJFS/JFS 3.5) product is the
next generation of the product known as HP OnlineJFS/JFS 3.3.
The base VERITAS File System 3.5 (HP JFS 3.5) is a new version of the base journaled
file system for HP-UX 11i and is available at no charge as part of HP-UX 11i v2.
The full VERITAS File System 3.5 (HP OnlineJFS 3.5) enables advanced file system
features and is ordered as a separate product.
NOTE The terms base VERITAS File System 3.5, HP JFS 3.5, and base VxFS are used
interchangeably throughout these release notes.
In addition, the terms full VERITAS File System 3.5, HP OnlineJFS 3.5, and full VxFS
are used interchangeably throughout these release notes.
All of these terms may appear in other related VERITAS File System (HP
OnlineJFS/JFS 3.5) documentation that accompanies this product.
Summary of Change
The VERITAS File System 3.5 (HP Online JFS/JFS 3.5) release contains the following
new and changed features:
• New and/or Enhanced Tunable Parameters – hsm_write_prealloc, read_ahead,
write_throttle
• Enhanced VxFS Commands – VxFS commands that have been enhanced are
vxdump, vxrestore, vxfsconvert, and mount.
• New I/O Error Handling Policy – The ioerror option has been added to the mount
command to provide four different ways to handle system I/O errors.
• New Default Intent Log Mode – To increase performance, the mount command
delaylog option has replaced the log option as the default for base/full VxFS 3.5 file
systems.
• New Default System Block Size - The new default file system block size is 1024 bytes
for all base/full VxFS 3.5 file systems.
• VxFS System Activity Reporter - The vxfsstat command displays VxFS file system
statistics, which can be used to analyze performance and aid in tuning.
• Forced Unmounts - A base/full VxFS 3.5-specific vxumount command is available in
this release to perform forced unmounts of VxFS file systems.
• Disable File Access Time - The -o noatime option has been added to the mount
command to disable access time updates.
• Parallel Log Replay - The fsck -o p option and fsck -p option allow a log replay on
multiple file systems in parallel.