Centralizes file system characteristics.
A file system is a complete directory structure, including a root ( / ) directory and any directories and files beneath it. A file system is confined to a logical volume. All of the information about the file system is centralized in the /etc/filesystems file. Most of the file system maintenance commands take their defaults from this file. The file is organized into stanza names that are file system names and contents that are attribute-value pairs specifying characteristics of the file system.
The filesystems file serves two purposes:
Each stanza names the directory where the file system is normally mounted. The file system attributes specify all the parameters of the file system. The attributes currently used are:
|account||Used by the dodisk command to determine the file systems to be processed by the accounting system. This value can be either the True or False value.|
|boot||Used by the mkfs command to initialize the boot block of a new file system. This specifies the name of the load module to be placed into the first block of the file system.|
|check||Used by the fsck command to determine the default file systems to be checked. The True value enables checking while the False value disables checking. If a number, rather than the True value is specified, the file system is checked in the specified pass of checking. Multiple pass checking, described in the fsck command, permits file systems on different drives to be checked in parallel.|
|dev||Identifies, for local mounts, either the block special file where the file system resides or the file or directory to be mounted. System management utilities use this attribute to map file system names to the corresponding device names. For remote mounts, it identifies the file or directory to be mounted.|
|mount|| Used by the mount command to determine whether this file system should be mounted by default. The possible values of the mount attribute are:
|size||Used by the mkfs command for reference and to build the file system. The value is the number of 512-byte blocks in the file system.|
|type||Used to group related mounts. When the mount -t String command is issued, all of the currently unmounted file systems with a type attribute equal to the String parameter are mounted.|
|vfs||Specifies the type of mount. For example, vfs=nfs specifies the virtual file system being mounted is an NFS file system.|
|vol||Used by the mkfs command when initializing the label on a new file system. The value is a volume or pack label using a maximum of 6 characters.|
|log||The LVName must be the full path name of the filesystem logging logical volume name to which log data is written as this file system is modified. This is only valid for journaled file systems.|
The following is an example of a typical /etc/filesystems file:
Attention: Modifying this file can cause several effects to file systems.
* * File system information * default: vol = "AIX" mount = false check = false /: dev = /dev/hd4 vol = "root" mount = automatic check = true log = /dev/hd8 /home: dev = /dev/hd1 vol = "u" mount = true check = true log = /dev/hd8 /home/joe/1: dev = /home/joe/1 nodename = vance vfs = nfs /usr: dev = /dev/hd2 vol = "usr" mount = true check = true log = /dev/hd8 /tmp: dev = /dev/hd3 vol = "tmp" mount = true check = true log = dev/hd8
Note: The asterisk (*) is the comment character used in the /etc/filesystems file.
This file is part of Base Operating System Runtime.
|/etc/filesystems||Lists the known file systems and defines their characteristics.|
|/etc/vfs||Contains descriptions of virtual file system types.|
The backup command, df command, dodisk command, fsck command, mkfs command, mount command, restore command, umount command.
The filesys.h file.
Directory Overview and Logical Volume Storage Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.