File Systems (FS's)

lsfs            Lists all filesystems
lsfs -q (fs)    Lists the file system details
lsjfs           Displays data about all filesystems in CSV style format

mount               Lists all the mounted filesystems
mount (fs or lv)    Mounts a named filesystem
mount -a            Mounts all filesystems
mount all 

mount -r -v cdrfs /dev/cd0 /cdrom        mounts cd0 drive over /cdrom

crfs -v jfs -d(lv) -m(mount point) -A yes
Will create a file system on the whole of the logical volume, adds entry into
/etc/filesystems and will create mount point directory if it does not exist. 
( use -v jfs2 for JFS2 filesystems )

crfs -v jfs -g(vg) -m(mount point) -a size=(size of fs) -A yes
Will create a logical volume on the volume group and create the file system on
the logical volume. All at the size stated. Will add entry into 
/etc/filesystems and will create the mount point directory if it does not exist.

Use attribute "-a log=/dev/log01" to specify a jfslog devices   
Use attrubute "-a bf=true" for a large file enabled filesystem           

chfs -A yes (fs)                 Change file system to Auto mount in 
                                 /etc/filesystems
chfs -a size=(new fs size)(fs)   Change file system size
chfs -m (new-mount-point) (fs)   Change the file system mount point.

rmfs (fs)            Removes the file system and will also remove the
                     LV if there are no onther file systems on it.

defrag -q (fs)       Reports the fragment status of the file system.
defragfs -r (fs)     Runs in report only defrag mode (no action).
defragfs (fs)        Defragments a file system.

fsck (fs)            Verify a file system, the file system must be unmounted!
fsck (-y or -n) (fs) Pre-answer questions either yes or no !
fsck -p (fs)         Will restore primary superblock from backup copy if the
                     superblock is corrupt.
              ( or dd count=1 bs=4k skip=31 seek=1 if=/dev/lv00 of=/dev/lv00 )