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Chapter 4. Monitoring the OpenShift Data Foundation Logical Volume Manager Operator

When the OpenShift Data Foundation Logical Volume Manager Operator is installed using the OpenShift Web Console, you can monitor the cluster using the Block and File dashboard in the console by default. However, when you use RHACM to install the OpenShift Data Foundation Logical Volume Manager Operator, you need to configure the RHACM Observability to monitor the all the SNO cluster from one place.

You can monitor the OpenShift Data Foundation Logical Volume Manager Operator by viewing the metrics exported by the operator on the RHACM dashboards and the alerts that are triggered. Enable RHACM Observability as described in the Observability guide.

Metrics
topolvm_thinpool_data_percent
topolvm_thinpool_metadata_percent
topolvm_thinpool_size_bytes
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Note

Metrics are updated every 10 minutes or when there is a change in the thin-pool, such as a new logical volume creation.

Alerts
When the thin pool and volume group are filled up, further operations fail and might lead to data loss. The Logical Volume Manager Operator sends the following alerts the usage of the thin pool and volume group crosses certain value:
Expand
Table 4.1. Alerts for Logical Volume Manager cluster in Red Hat Advanced Cluster Management for Kubernetes
AlertDescription

VolumeGroupUsageAtThresholdNearFull

This alert is triggered when both the volume group and thin pool utilization cross 75% on nodes. Data deletion or volume group expansion is required.

VolumeGroupUsageAtThresholdCritical

This alert is triggered when both the volume group and thin pool utilization cross 85% on nodes.VolumeGroup is critically full. Data deletion or volume group expansion is required.

ThinPoolDataUsageAtThresholdNearFull

This alert is triggered when the thin pool data utilization in the volume group crosses 75% on nodes. Data deletion or thin pool expansion is required.

ThinPoolDataUsageAtThresholdCritical

This alert is triggered when the thin pool data utilization in the volume group crosses 85% on nodes. Data deletion or thin pool expansion is required.

ThinPoolMetaDataUsageAtThresholdNearFull

This alert is triggered when the thin pool metadata utilization in the volume group crosses 75% on nodes. Data deletion or thin pool expansion is required.

ThinPoolMetaDataUsageAtThresholdCritical

This alert is triggered when the thin pool metadata utilization in the volume group crosses 85% on nodes. Data deletion or thin pool expansion is required.

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