Hi @Varyanitsa
Regarding the gaps, if you have LUNs that have 0 IOs the latency is also 0, and Harvest does not submit data points with a value of 0. If Grafana requests those data points it gets a null value, which by default in Grafana shows as a connected line. You can modify Grafana to show null values as 0:

Regarding the skipped polls, I think this occurs because the time it takes Harvest to collect all data from the cluster is greater than your configured poll time. After Harvest collects data it schedules the next update, but if that update time is in the past it will skip it. I would recommend increasing your poll frequency to 60s and see if you still have frequent skipped messages. You would also need to update your Graphite storage-schemas.conf file with this new frequency, and either remove all metric files and let them be recreated or use the whisper-resize.py utility to resize them. This post has more info about resizing.
Cheers,
Chris Madden
Solution Architect - 3rd Platform - Systems Engineering NetApp EMEA (and author of Harvest)
Blog: It all begins with data
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