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       os_mon - OS Monitoring Application


       The operating system monitor, OS_Mon, provides the following services:

         * cpu_sup CPU load and utilization supervision (Unix)

         * disksup Disk supervision(Unix, Windows)

         * memsup Memory supervision (Unix, Windows, VxWorks)

         * os_sup Interface to OS system messages (Solaris, Windows)

       To  simplify  usage  of OS_Mon on distributed Erlang systems, it is not
       considered an error trying to use a service at a node where it  is  not
       available (either because OS_Mon is not running, or because the service
       is not available for that OS, or because the service is  not  started).
       Instead, a warning message is issued via error_logger and a dummy value
       is returned, which one is specified in the man pages for the respective


       When  OS_Mon  is started, by default all services available for the OS,
       except os_sup, are automatically started.  This  configuration  can  be
       changed using the following application configuration parameters:

          start_cpu_sup = bool()
             Specifies if cpu_sup should be started. Defaults to true.

          start_disksup = bool()
             Specifies if disksup should be started. Defaults to true.

          start_memsup = bool()
             Specifies if memsup should be started. Defaults to true.

          start_os_sup = bool()
             Specifies if os_sup should be started. Defaults to false.

       Configuration  parameters  effecting  the different OS_Mon services are
       described in the respective man pages.

       See config(4)  for  information  about  how  to  change  the  value  of
       configuration parameters.


       The following MIBs are defined in OS_Mon:

             This MIB contains objects for instrumentation of disk, memory and
             CPU usage of the nodes in the system.

       The MIB is stored in the mibs directory. It is defined  in  SNMPv2  SMI
       syntax.  An  SNMPv1  version  of  the  MIB  is delivered in the mibs/v1

       The compiled MIB is located under priv/mibs,  and  the  generated  .hrl
       file  under  the  include  directory. To compile a MIB that IMPORTS the
       OTP-OS-MON-MIB, give the option {il, ["os_mon/priv/mibs"]} to  the  MIB

       If  the  MIB  should  be  used in a system, it should be loaded into an
       agent with a call to os_mon_mib:load(Agent), where Agent is the pid  or
       registered  name  of  an  SNMP  agent.  Use os_mon_mib:unload(Agent) to
       unload the MIB. The implementation of this MIB uses Mnesia to  store  a
       cache  with  data  needed,  which implicates that Mnesia must be up and
       running. The MIB also use functions defined for the OTP-MIB, thus  that
       MIB must be loaded as well.


       cpu_sup(3erl),      disksup(3erl),      memsup(3erl),     os_sup(3erl),
       nteventlog(3erl), snmp(3erl).