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How the FlexVol volume and aggregate fullness alerts work

Data ONTAP provides alerts when FlexVol volumes and aggregates are running out of space so that you can take corrective action by providing more space for the full volume or aggregate.

The alerts are triggered at two thresholds: nearly full and full. The thresholds are based on percentage levels of used space based on the current volume size.

The volume fullness thresholds are configurable. You use the space-nearly-full-threshold-percent and space-full-threshold-percent parameters to view and modify the volume fullness thresholds. A value of 0 disables the alert.

You cannot configure or disable the aggregate fullness thresholds; they are set at 95 and 98 percent for full and nearly full, respectively.

The following table shows valid values, EMS message type, and command parameter for the volume fullness thresholds:

Fullness threshold Valid values EMS when exceeded
Nearly full (volume)

0 to 99%

95% is default

monitor.volume.nearlyFull (debug level)
Full (volume)

0 to 100%

98% is default

monitor.volume.full (debug level)
Nearly full (aggregate) 95 monitor.volume.nearlyFull (debug level)
Full (aggregate) 98 monitor.volume.full (debug level)

Every time a threshold is crossed for a volume or aggregate, whether the fullness percentage is rising or falling, an EMS message is generated. When the fullness level of the volume or aggregate falls below a threshold, a volume ok or aggregate ok EMS message is generated. You can view the EMS messages by using the ems event status command or the ems event log command. In addition to EMS messages, you can configure your system to send SNMP traps.

For more information about viewing and managing events (EMS messages) and SNMP traps, see the Clustered Data ONTAP System Administration Guide for Cluster Administrators.