/etc/filesystems 存放这许多文件系统的所有信息，许多维护文件系统的命令都是从这个文件中获取的文件系统的默认属性。此文件的格式是stanza 格式的。包含文件系统的名字和属性。
ufserver[/]#cat /etc/filesystems
* @(#)filesystems @(#)29        1.22  src/bos/etc/filesystems/filesystems, cmdfs, bos530 9/8/00 13:57:45
* IBM_PROLOG_BEGIN_TAG
* This is an automatically generated prolog.
* bos530 src/bos/etc/filesystems/filesystems 1.22
* IBM_PROLOG_END_TAG
* COMPONENT_NAME: CMDFS
* FUNCTIONS: none
* ORIGINS: 27
*
* US Government Users Restricted Rights - Use, duplication or
* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
*
* This version of /etc/filesystems assumes that only the root file system
* is created and ready.  As new file systems are added, change the check,
* mount, free, log, vol and vfs entries for the appropriate stanza.
*

/:
        dev             = /dev/hd4   --文件对应的逻辑设备，逻辑卷
        vfs             = jfs2       -- mount的类型
        log             = /dev/hd8   ---文件系统的日志设备。该项只对jfs 和jfs2 有用。
        mount           = automatic  --文件系统默认安装方式 
                                        1 automatic
                                        2 true  用mount all 命令安装，用unmount all 卸载文件，系统初始化时自动执行  mount all。
                                        3 false 文件系统不会自动安装，必须手动安装(用mount 命令单独安装)
                                        4 readonly 文件系统以只读的方式安装
        check           = false      --文件系统是否由fsck 命令在默认情况下检查。   
        type            = bootfs     --文件系统类型，用于按类型分组安装文件系统。mount -t type
        vol             = root       --文件系统的卷标
        free            = true       --

/home:
        dev             = /dev/hd1
        vfs             = jfs2
        log             = /dev/hd8
        mount           = true
        check           = true
        vol             = /home
        free            = false

/usr:
        dev             = /dev/hd2
        vfs             = jfs2
        log             = /dev/hd8
        mount           = automatic
        check           = false
        type            = bootfs
        vol             = /usr
        free            = false

/var:
        dev             = /dev/hd9var
        vfs             = jfs2
        log             = /dev/hd8
        mount           = automatic
        check           = false
        type            = bootfs
        vol             = /var
        free            = false

/opt:
        dev             = /dev/hd10opt
        vfs             = jfs2
        log             = /dev/hd8
        mount           = true
        check           = true
        vol             = /opt
        free            = false

/ora10g:
        dev             = /dev/ora10g
        vfs             = jfs2
        log             = /dev/loglv00
        mount           = true
        options         = rw
        account         = false

/db2data:
        dev             = /dev/db2data
        vfs             = jfs2
        log             = /dev/loglv00
        mount           = true
        options         = rw
        account         = false
ufserver[/]#cat /etc/vfs
# @(#)vfs  @(#)77       1.30  src/bos/etc/vfs/vfs, cmdfs, bos530 2/26/04 10:48:56
# IBM_PROLOG_BEGIN_TAG
# This is an automatically generated prolog.
# bos530 src/bos/etc/vfs/vfs 1.30
# IBM_PROLOG_END_TAG
# COMPONENT_NAME: CFGETC
# FUNCTIONS:
# ORIGINS: 27
# this file describes the known virtual file system implementations.
# format: (the name and vfs_number should match what is in )
# The standard helper directory is /etc/helpers
# name  vfs_number mount_helper filsys_helper
# Uncomment the following line to specify the local or remote default vfs.
%defaultvfs     jfs2    nfs
#
#名称 虚拟文件  vfs类型的安装助手           vfs类型的文件系统助手
      系统类型  程序路径                    程序路径名
      代码
cdrfs   5       none                            none
procfs  6       none                            none
jfs     3       none                           /sbin/helpers/v3fshelper
jfs2    0       /sbin/helpers/jfs2              none
nfs     2       /sbin/helpers/nfsmnthelp        none                    remote
sfs     16      none                            none
nfs3    18      /sbin/helpers/nfsmnthelp        none                    remote
nfs4    35      /sbin/helpers/nfsmnthelp        none                    remote
cachefs 17      /sbin/helpers/cfsmnthelp        none                    remote
udfs    34      /sbin/helpers/udfmnthelp        none
cifs    37      /sbin/helpers/mount_cifs        none
autofs  19      /sbin/helpers/aufsmnthelp       none
ufserver[/]#
%defaultvfs --控制标识
jfs2        --默认的本地虚拟文件系统的类型
nfs         --默认的远程虚拟文件系统类型