Monitoring block storage

After creating a target group, you can monitor it on the Overview tab. The charts show the read and write I/O activity and latency across all LUNs attached to the target group.

Advanced iSCSI monitoring via Grafana

For advanced monitoring of target groups, go to the Monitoring > Dashboard screen, and then click Grafana dashboard. A separate browser tab will open with preconfigured Grafana dashboards. Two of them are dedicated to the iSCSI service. To see a detailed description for each chart, click i in the chart’s top left corner.

On the iSCSI overview dashboard, note the following charts:

• iSCSI availability. The chart shows target availability. Time periods when the targets have not been available will be highlighted in red. In this case, check /var/log/vstorage/iscsi/vstorage-target-monitor.log on the nodes with the failed service and report a problem.
• Latency. The chart shows the time spent on read and write I/O operations across all iSCSI LUNs. It should average a few dozens of milliseconds with peak values below 1s.

The iSCSI details dashboard is intended for troubleshooting by the technical support team. To monitor a particular target group, target, session, or LUN, select it from a drop-down list above.