Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

Temporary file system mode
On most UNIX systems, temporary file system directories, such as /tmp and
/usr/tmp, often hold files that do not need to be retained when the system reboots.
The underlying file system does not need to maintain a high degree of structural
integrity for these temporary directories. VxFS provides the mount -o tmplog
option, which allows the user to achieve higher performance on temporary file
systems by delaying the logging of most operations.
Improved synchronous writes
VxFS provides superior performance for synchronous write applications. The
mount -o datainlog option greatly improves the performance of small
synchronous writes.
The mount -o convosync=dsync option improves the performance of applications
that require synchronous data writes but not synchronous inode time updates.
Warning: The use of the -o convosync=dsync option violates POSIX semantics.
Support for large files
With VxFS, you can create, mount, and manage file systems containing large files
(files larger than two gigabytes).
Warning: Some applications and utilities may not work on large files.
Access Control Lists
An Access Control List (ACL) stores a series of entries that identify specific users
or groups and their access privileges for a directory or file. A file may have its
own ACL or may share an ACL with other files. ACLs have the advantage of
specifying detailed access permissions for multiple users and groups. For VxFS
file systems created with the Version 5, 6, 7, or 8 disk layouts, up to 1024 ACL
entries can be specified. ACLs are also supported on cluster file systems.
See the getacl(1) and setacl(1) manual pages.
Storage Checkpoints
To increase availability, recoverability, and performance, Veritas File System
offers on-disk and online backup and restore capabilities that facilitate frequent
Introducing Veritas File System
Veritas File System features
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