How to Create a TMPFS File System

Steps

1. Become superuser or assume an equivalent role.

2. Create the directory that you want to mount as the TMPF file system, if necessary.

   # mkdir /mount-point

   mount-point is the directory on which the TMPFS file system is mounted.

3. Mount the TMPFS file system.

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

   -o size=number

   Specifies the size limit of the TMPFS file system in Mbytes.

   mount-point

   Specifies the directory on which the TMPFS file system is mounted.

   To set up the system to automatically mount a TMPFS file system when it boots, see Example 16–3.

4. Verify that the TMPFS file system has been created.

   # mount -v

Example 16–2 Creating a TMPFS File System

The following example shows how to create, mount, and limit the size of the TMPFS file system, /export/reports, to 50 Mbytes.

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

Example 16–3 Mounting a TMPFS File System at Boot Time

You can set up the system to automatically mount a TMPFS file system when it boots by adding an /etc/vfstab entry. The following example shows an entry in the /etc/vfstab file that mounts /export/test as a TMPFS file system 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 on the /etc/vfstab file, see Field Descriptions for the /etc/vfstab File.