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CMON(1)								       CMON(1)

NAME
       cmon - Coda server monitor

SYNOPSIS
       cmon [ -a ] [ -t	probeinterval ]	server [ server	... ]

DESCRIPTION
       cmon probes the specified list of servers once every probeinterval sec-
       onds and	reports	on their status. If a server is	down  or  unreachable,
       cmon tries to reestablish contact with it once every probeinterval sec-
       onds.  It uses the curses(3) package for	screen management and  can  be
       used  on	 dumb  terminals.   Run	 cmon  in  a  terminal	emulator (like
       xterm(1)).

       Some cmon data can be displayed in relative or absolute modes.  In rel-
       ative mode, data	is reported with reference to the interval between the
       last two	probes.	 In absolute mode, the accumulated  value  since  ini-
       tialization is reported.	 cmon can be toggled between absolute and real
       modes of	presentation from the keyboard.	 Typing	a will cause  data  to
       be  presented  in  absolute mode.  Typing r will	present	it in relative
       mode.  A	mode change will only take place at the	next probe.

OPTIONS
       The command-line	options	are:

       -a     Report data in absolute mode.

       -t     Probe servers every probeinterval	seconds. Default is 60.

OUTPUT
       The data	reported by cmon is organized under four headings:  TIM,  CPU,
       RPC, and	DSK.

       The TIM data is as follows:

       mon    time at which this cmon process was created.

       prob   time at which the	server was last	probed.

       succ   time at which the	server last responded to a probe.

       up     time at which the	server process was started.

       bind   number  of times contact was reestablished after a failed	probe.
	      A	probe may fail due to server or	network	failures.

       The CPU data is as follows:

       sys    Relative or absolute number of seconds of	system CPU  time  used
	      on the server.

       user   Relative or absolute number of seconds of	user CPU time (regular
	      or niced)	used on	the server.

       util   Relative or absolute number of system and	user  seconds  divided
	      by corresponding time of accumulation.

       The RPC data is as follows:

       conn   Number of	RPC connections.

       wkst   Number  of workstations connected	to server.  Note that each in-
	      stance of	cmon shows up as a workstation.

       call   Relative or absolute number of RPC calls received.

       pki    Relative or absolute number of RPC packets  received.   Includes
	      duplicates  and other bogus packets. Also	includes bulk transfer
	      packets.

       pko    Relative or absolute number of packets sent.  Includes  retrans-
	      missions.	Also includes bulk transfer packets.

       byi    Bytes corresponding to pki.

       byo    bytes corresponding to pko.

       The DSK data is as follows:

       max1   Identity	and  percent  usage  of	 most  full  disk partition on
	      server.  The identity is the name	of mount point.	 Names	longer
	      than  5  characters are truncated	to the first 3 characters, a $
	      character, and the last character.

       max2   Identity and percent usage of second most	full disk.

       max3   Identity and percent usage of third most full disk.

DIAGNOSTICS
       If a server is down or unreachable, statisitics for it are reported  as
       "???".

       Relative	 data  is  undefined  until two	or more	probes have been made.
       Such data is reported as	 "***"	between	 the  very  first  and	second
       probes.

BUGS
       o Relative  computations	 are  just based on the	difference between the
	 two most recent probes.  A smarter approach (especially for CPU  uti-
	 lization) would be to use some	kind of	weighted history.

       o The  display  is  optimized for maximum packing of information	into a
	 small screen area. It may be cryptic for a novice.

       o No disk information is	 available  about  the	root  partition	 on  a
	 server.

       o Will core dump	if run in a window with	fewer than 25 lines.

       o No way	to force a redisplay (eg ^L).

SEE ALSO
       codacon(1), vutil(8), curses(3)

AUTHORS
       o M. Satyanarayanan, 1990, Created

Coda Distributed File System	 25 April 2005			       CMON(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OUTPUT | DIAGNOSTICS | BUGS | SEE ALSO | AUTHORS

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