Veritas™ File System 5.0.1 Administrator's Guide

is not to specify either option. After a file system is mounted, you can use the
fsadm utility to change the large files option.
Managing a file system with large files
Managing a file system with large files includes the following tasks:
■ Determining the current status of the large files flag
■ Switching capabilities on a mounted file system
■ Switching capabilities on an unmounted file system
To determine the current status of the largefiles flag, type either of the following
commands:
# mkfs -F vxfs -m special_device
# fsadm -F vxfs mount_point | special_device
To switch capabilities on a mounted file system:
# fsadm -F vxfs -o [no]largefiles mount_point
To switch capabilities on an unmounted file system:
# fsadm -F vxfs -o [no]largefiles special_device
You cannot change a file system to nolargefiles if it contains large files.
See the mount_vxfs(1M), fsadm_vxfs(1M), and mkfs_vxfs(1M) manual pages.
The cio option
The cio (Concurent I/O) option specifies the file system to be mounted for
concurrent readers and writers. Concurrent I/O is a licensed feature of VxFS. If
cio is specified, but the feature is not licensed, the mount command prints an
error message and terminates the operation without mounting the file system.
The cio option cannot be disabled through a remount. To disable the cio option,
the file system must be unmounted and mounted again without the cio option.
The mntlock|mntunlock option
The mntlock option prevents a file system from being unmounted by an
application. This option is useful for applications that do not want the file systems
that the applications are monitoring to be improperly unmounted by other
applications or administrators.
43VxFS performance: creating, mounting, and tuning file systems
Mounting a VxFS file system