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NAME

       disksup - A Disk Supervisor Process

DESCRIPTION

       disksup  is  a process which supervises the available disk space in the system. It is part
       of the OS_Mon application, see os_mon(7). Available for Unix and Windows.

       Periodically checks the disks. For each disk or partition which uses more than  a  certain
       amount of the available space, the alarm {{disk_almost_full, MountedOn}, []} is set.

         On Unix:
           All (locally) mounted disks are checked, including the swap disk if it is present.

         On WIN32:
           All logical drives of type "FIXED_DISK" are checked.

       Alarms  are  reported to the SASL alarm handler, see alarm_handler(3erl). To set an alarm,
       alarm_handler:set_alarm(Alarm) is called where Alarm is the alarm specified above.

       The alarms are cleared automatically when the alarm cause is no longer valid.

CONFIGURATION

       The following configuration parameters can be used to change the default values  for  time
       interval and threshold:

         disk_space_check_interval = int()>0:
           The  time  interval,  in minutes, for the periodic disk space check. The default is 30
           minutes.

         disk_almost_full_threshold = float():
           The threshold, as percentage of total disk space, for how much disk  can  be  utilized
           before the disk_almost_full alarm is set. The default is 0.80 (80%).

         disksup_posix_only = bool():
           Specifies whether the disksup helper process should only use POSIX conformant commands
           (true) or not. The default is false. Setting this parameter to true can  be  necessary
           on  embedded  systems  with stripped-down versions of Unix tools like df. The returned
           disk data and alarms can be different when using this option.

           The parameter is ignored on platforms that  are  known  to  not  be  posix  compatible
           (Windows and SunOS).

       See config(5) for information about how to change the value of configuration parameters.

EXPORTS

       get_disk_data() -> [DiskData]

              Types:

                 DiskData = {Id, KByte, Capacity}
                  Id = string()
                  KByte = int()
                  Capacity = int()

              Returns  the  result  of  the latest disk check. Id is a string that identifies the
              disk or partition. KByte is the total size of the  disk  or  partition  in  kbytes.
              Capacity is the percentage of disk space used.

              The function is asynchronous in the sense that it does not invoke a disk check, but
              returns the latest available value.

              Returns [{"none",0,0}] if disksup is not available.

       get_check_interval() -> MS

              Types:

                 MS = int()

              Returns the time interval, in milliseconds, for the periodic disk space check.

       set_check_interval(Minutes) -> ok

              Types:

                 Minutes = int()>=1

              Changes the time interval, given in minutes, for the periodic disk space check.

              The change will take effect after the next disk space  check  and  is  non-persist.
              That  is,  in  case  of  a process restart, this value is forgotten and the default
              value will be used. See Configuration above.

       get_almost_full_threshold() -> Percent

              Types:

                 Percent = int()

              Returns the threshold, in percent, for disk space utilization.

       set_almost_full_threshold(Float) -> ok

              Types:

                 Float = float(), 0=<Float=<1

              Changes the threshold, given as a float, for disk space utilization.

              The change will take effect during the next disk space check  and  is  non-persist.
              That  is,  in  case  of  a process restart, this value is forgotten and the default
              value will be used. See Configuration above.

SEE ALSO

       alarm_handler(3erl), os_mon(3erl)