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FS(4)											    FS(4)

       fs - file server, dump


       The  file server is the main file system for Plan 9.  It is a stand-alone system that runs
       on a separate computer.	It serves the Plan 9 protocol on a variety of networks	including
       Datakit/URP,  Ethernet  IL/IP  and Cyclone fiber direct connections.  The name of the main
       file server at Murray Hill is bootes.

       The file server normally requires all users except to provide  authentication  tickets  on
       each  attach(5).   This can be disabled using the noauth configuration command (see fscon-

       The user none is always allowed to attach to bootes without authentication but has minimal

       Bootes  maintains  three  file  systems on a combination of disks and write-once-read-many
       (WORM) magneto-optical disks.

       other  is a simple disk-based file system similar to kfs(4).

       main   is a worm-based file system with a disk-based look-aside	cache.	 The  disk  cache
	      holds  modified  worm  blocks to overcome the write-once property of the worm.  The
	      cache also holds recently accessed non-modified blocks to speed  up  the	effective
	      access  time  of the worm.  Occasionally (usually daily at 5AM) the modified blocks
	      in the disk cache are dumped.  At this time, traffic to the file system  is  halted
	      and  the modified blocks are relabeled to the unwritten portion of the worm.  After
	      the dump, the file system traffic is continued and the relabeled blocks are  copied
	      to the worm by a background process.

       dump   Each time the main file system is dumped, its root is appended to a subdirectory of
	      the dump file system.  Since the dump file system  is  not  mirrored  with  a  disk
	      cache,  it is read-only.	The name of the newly added root is created from the date
	      of the dump: /yyyy/mmdds.  Here yyyy is the full year, mm is the month  number,  dd
	      is  the  day  number  and s is a sequence number if more than one dump is done in a
	      day.  For the first dump, s is null.  For the subsequent dumps s is 1, 2, 3, etc.

	      The root of the main file system that is frozen on the first dump of March 1,  1992
	      will be named /1992/0301/ in the dump file system.

       Place  the root of the dump file system on /n/dump and show the modified times of the MIPS
       C compiler over all dumps in February, 1992:

	      9fs dump
	      ls -l /n/dump/1992/02??/mips/bin/vc

       To get only one line of output for each version of the compiler:

	      ls -lp /n/dump/1992/02??/mips/bin/vc | uniq

       Make the other file system available in directory /n/bootesother:

	      mount -c /srv/boot /n/bootesother other


       yesterday(1), srv(4), fs(8)
       Sean Quinlan, ``A Cached WORM File System'', Software - Practice and Experience, December,

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