File Systems for BSD 4.3 System Managers

This information offers a brief comparison of AIX file systems to other systems' file systems, and an outline of the supported file systems types on AIX systems.

The AIX system uses the /etc/filesystem file to list file system device information, and has similar commands for mounting and unmounting file systems.

/etc/filesystems File and /etc/fstab File

4.3 BSD systems store lists of block devices and mount points in the /etc/fstab file.

SVR4 systems stores block devices and mount point information in /etc/vfstab file.

AIX stores block device and mount points information in /etc/filesystems file. The crfs, chfs, and rmfs commands update the /etc/filesystems file.

4.3 BSD system administrators may be interested in the check variable in the /etc/filesystems file. The check variable can be set to the value True, False or to a number. For example, you can specify check=2 in the /etc/filesystems file. The number specifies the pass of the fsck command that will check this file system. The check parameter corresponds to the fifth field in an /etc/fstab file record.

There is no dump frequency parameter in the /etc/filesystems file.

File System Support on AIX

AIX supports disk quotas.

AIX does not allow mounting of diskettes as file systems.

The syntax of the AIX mount and umount commands differs from 4.3 BSD and from SVR4 versions of these commands. The commands to mount and unmount all file systems at once are shown for all three systems in the following table:

See the "File Systems Overview" for more information.