Mount options

The mount command has numerous options to tailor a file system for various functions and environments.

The following table lists some of the specific_options:

Security feature

If security is important, use blkclear to ensure that deleted files are completely erased before the space is reused.

Support for large files

If you specify the largefiles option, you can create files larger than two gigabytes on the file system. The default option is largefiles.

Using Storage Checkpoints

The ckpt=checkpoint_name option mounts a Storage Checkpoint of a mounted file system that was previously created by the fsckptadm command.

Using databases

If you are using databases with VxFS and if you have installed a license key for the Veritas Quick I/O for Databases feature, the mount command enables Quick I/O by default (the same as specifying the qio option). The noqio option disables Quick I/O. If you do not have Quick I/O, mount ignores the qio option. Alternatively, you can increase database performance using the mount option convosync=direct, which utilizes direct I/O.

News file systems

If you are using cnews, use delaylog (or tmplog),mincache=closesync because cnews does an fsync() on each news file before marking it received. The fsync() is performed synchronously as required, but other options are delayed.

Temporary file systems

For a temporary file system such as /tmp, where performance is more important than data integrity, use tmplog,mincache=tmpcache.

Locking a file system

If you specify the mntlock option, you can lock a file system to disallow unmounting the file system except if the mntunlock option is specified. The mntlock is useful for applications for which you do not want the file systems that the applications are monitoring to be improperly unmounted by other applications or administrators.

See Mounting a VxFS file system.

See the filesystems, fsckptadm(1M), mount, and mount_vxfs(1M) manual pages.

More Information

About Quick I/O