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Check manual page of oracle_asm_diskgroup

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Oracle: ASM Disk Groups

Distribution: official part of Check_MK
License: GPL
Supported Agents: Linux, Solaris, HPUX

This check measures the usage of ASM Disk Groups. The usage is checked against a warning and a critical level, which can be specified in numerous ways.

Requirements: The agent_plugin mk_oracle is needed on the monitored machines. See details for mk_oracle at manpage of oracle_instance. All Failure Groups need the same size. Otherwise the calculation of total and used space is wrong. Disk Groups with Voting require 3 for NORMAL and 5 for HIGH Redundancy!

Trends: This checks supports Disk Group trends. This means that the check is able to compute the change of the used space over the time and can make a forecast into the future. It can estimate the time when the Disk Group will be full.

In a default configuration the check will compute the trend based on the data of the last 24 hours using a logarithmic average that gives more recent data a higher weight. Also data beyond the 24 hours will to some small degree be reflected in the computation. The advantage of this algorithm is a more precise prediction and a simpler implementation, which does not need any access to any RRDs or similar storage.

Please note that when a Disk Group is started to be monitored, the trend of the past is unknown and is assumed to be zero. It will take at least one trend range of time until the trend approximately reflects the reality.


The name of the disk group as delivered by the agent without the / at the end.

See also check manpage for df. All configurations are usable for Oracle ASM Disk Groups as well.


One service is created for each Disk Group.