====== Database disk usage ======
===== Purpose =====
  HANA database uses disks for persistence. To run out of disk space is to avoid at all cost to maintain the service running.
   This monitor will check disk used space of the HANA database at different levels.
===== Configuration hints =====
  * Create a rule in the surveillance table for each type of usage you want to monitor.
  * Use host and service filter to customize the monitoring for a given node or service

  * Disk usage is computed at differents levels:  
    * Node level: The combined usage of all services
      * Select TOTAL in service column to check global usage of a particular storage type
    * Service level: The usage of each individual service.
      * Select ANY in service column to cover all services
      * Or select a particular service
     
  *  Disk utilizations are split into several types: DATA, LOG, TRACE, DATA_BACKUP and LOG_BACKUP
  *  For each category, you can monitor the current disk usage as well as the delta usage over a period of time (for services).

===== Atomic fields =====
^ Auto clear ^
| If set, the generated alarms will be automatically cleared from the console if the alarm condition is not fulfilled anymore |

===== Surveillance table =====
^Parameter^Description^
^Active|If checked, the rule is enabled and will be processed|
^Usage|The type of usage of the disk|
^Host|Can be used to restrict the monitoring to a given host (multi instance case). A star (‘*’) will match any host|
^Service|Defines which service is monitored. A star (‘*’) will match any service, and therefore, it will calculate the combined usage of all services. Otherwise, it is the usage of the specified service that will be calculated|
^Max used space (MB or %)|The alarm threshold for the current disk usage. You can specify percentage or absolute value in Mega Bytes|
^Max used space delta (MB or %)|The alarm threshold on the delta disk usage increase over the period set in the “Delta time” field. Example: Send an alarm if the disk usage increases by 20% in the last 5 min|
^Delta time (min)|The period of time used to make a delta comparison of the disk usage|
^Severity|Defines the level of severity of the alarm that will be generated if one of the thresholds is reached|
^Alarm tag|You can define some text to use as a prefix of the alarm message generated by the current rule|
^Alarm|Defines if an alarm has to be generated for the given rule|
^Metric|Defines if a metric has to be generated for the given rule|
=== Generated metrics ===
 
^metricId^metricUnit^metricTarget^metricDescription^
|DISK_USED_SPACE|Mega Bytes|HOST/TYPE|Sends disk usage per type of storage|
|DISK_USED_SPACE_PER_SERVICE|Mega Bytes|HOST/SERVICE/TYPE|Sends disk usage per type of storage and service|