VERITAS File System 4.1 Administrator's Guide

VxFS Performance: Creating, Mounting, and Tuning File Systems

Choosing mount Command Options

Chapter 248

NOTE Applications and utilities such as backup may experience problems if they are

not aware of large ﬁles. In such a case, create your ﬁle system without large ﬁle

capability.

Creating a File System with Large Files

You can create a ﬁle system with large ﬁle capability by entering the following command:

# mkfs -F vxfs -o largefiles

special_device size

Specifying largefiles sets the largefiles ﬂag, which allows the ﬁle system to hold ﬁles up

to two terabytes in size. Conversely, the default nolargefiles option clears the ﬂag and

prevents large ﬁles from being created:

# mkfs -F vxfs -o nolargefiles

special_device size

NOTE The largefiles ﬂag is persistent and stored on disk.

Mounting a File System with Large Files

If a mount succeeds and nolargefiles is speciﬁed, the ﬁle system cannot contain or create

any large ﬁles. If a mount succeeds and largefiles is speciﬁed, the ﬁle system may contain

and create large ﬁles.

The mount command fails if the speciﬁed largefiles|nolargefiles option does not match

the on-disk ﬂag.

The mount command defaults to match the current setting of the on-disk ﬂag if speciﬁed

without the largeﬁles or nolargeﬁles option, so it’s best 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

You can determine the current status of the largeﬁles ﬂag using the fsadm command:

# mkfs -F vxfs -m

special_device

# fsadm -F vxfs

mount_point | special_device

You can switch capabilities on a mounted ﬁle system using the fsadm command:

# fsadm -F vxfs -o [no]largefiles

mount_point

You can also switch capabilities on an unmounted ﬁle system:

# fsadm -F vxfs -o [no]largefiles

special_device