How to Create a TMPFS File System

1. Become superuser.

2. If necessary, create the directory where you want to mount the TMPFS file system and set permissions and ownership as necessary.

3. Create a TMPFS file system.

   To set up the system to automatically create a TMPFS file system when it boots, see "Example--Creating a TMPFS File System at Boot Time".

   # mount -F tmpfs -o size=number swap mount-point

   size=number	Specifies the size of the TMPFS file system in Mbytes.
   mount-point	The directory on which the TMPFS file system is mounted.

4. Look at the output from the mount command to verify that the TMPFS file system has been created.

   # mount -v

Example--Creating a TMPFS File System

The following example creates a new directory, /export/reports, and mounts a TMPFS file system at that point, limiting it to 50 Mbytes.

# mkdir /export/reports
# chmod 777 /export/reports
# mount -F tmpfs -o size=50 swap /export/reports

Example--Creating a TMPFS File System at Boot Time

You can set up the system to automatically create a TMPFS file system when it boots by adding an entry to the /etc/vfstab file. The following example shows an entry in the /etc/vfstab file that will create a TMPFS file system on /export/test when the system boots. Since the size=number option is not specified, the size of the TMPFS file system on /export/test is limited only by the available system resources.

swap - /export/test  tmpfs   -  yes  -

For more information the /etc/vfstab file, see "/etc/vfstab Field Descriptions".