Chapter 8

File Systems

A file system is a mounted directory and the file directory below it.
File sysems may represent formatted disk partitions, remote file systems or internal system information
boot-time filesystem locations are specified in /etc/vfstab

Disk file sysem type:

UFS   Unix File System (default disk filesystem) based on the BSD filesystem
HSFS   High Seirra File System   Used for CD-ROMs
PCFS   MS-DOS / Windows fike system PC File System
UDF   Universal Disk Format   used mostly on DVDs, but can be used for CD -ROMs and floppies

Virtual File Systems

Are RAM-Based (internatl to the system).
Some represent internal system state
Some simply allow speeded-up file system acces

CACHEFS	CACHE FileSystem used to speed access to slower filesystems, like CDROMs and NFS
FDFS	File Descriptor File System used for opening files by internal file descriptors (used internally by some programs)
LOFS	LOopback File System virtual filesystem, allows one part of the file system to appear to be in a second location
NAMEFS	Used by strams protocal (some programs) for mounting file descriptors on top of files
PROCFS	allows filesystem access to the internal states of processes (running programs)
SPECFS	SPECial file File System Special files represent IO/Devices and/or internal system states.
SWAPFS	VM swap files (not usually visible)
TMPFS	TeMPorary FileSystem stored in RAM/Swap... faster access than disk. Disappears on unount/reboot
NFS	Network File System Default method of accessing remote UNIX filesystems

Creating a UFS filesystem:

newfs partition-name

partitions are usually inthe fomat: /dev/rdsk/cN[tN]dNsN
(where N is a number)