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PEGA0085 alert: Decision Data Store disk space below threshold

The PEGA0085 alert is triggered when the amount of free disk space on a Decision Data Store node is lower than the amount of disk space that is used by Cassandra on this node.

For example, when you compact data in the Cassandra database, compaction causes a spike in the disk usage. You need at least 60% of free disk space to perform this operation. For more information, see DDS service node status information and Managing decision data nodes.

Example message text

Disk space available to the Decision Data Store service decreased to <available disk space>, when it must be at least <used disk space>. Free up or allocate more disk space to the node.

The following variables are in the message text:

  • <available disk space> is the amount of free disk space that is allocated to the Decision Data Store node.
  • <used disk space> is the amount of disk space used by Cassandra records.

Default prconfig.xml setting

The alert is triggered when the ratio between the free disk space and the disk space used by Cassandra is lower than the threshold of 100 percent. The disk space threshold is established in the following prconfig.xml file setting:

<env name="alerts/ddsDiskSpacePercentage" value="100" />

The ratio between the free disk space and the disk space used by Cassandra is checked automatically every 10 minutes.

Next steps

To eliminate this alert, ask the system administrator to free up or allocate more disk space. The amount of free disk space needs to be bigger than the space used by Cassandra records to accommodate compaction.

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