Hi @LORENZO_CONTI
Each metric in Graphite correlates to a <metricname>.wsp database file on the Graphite host filesystem, and the hierarchy is built as subdirectories that ultimately contain that file. If you want to rename any piece of the metric name a simple filesystem directory and/or database file rename will do it. In your case you probably have metrics files with the old node name (and lots of history), and recently created metrics files with the new names (and only recent history). If you don't care about history you can simply remove those old directories/files. If you do care about history you can use a Graphite whisper tool to merge the datapoints: whisper-fill.py It gets a little harder since all the metrics are in two sets of subdirectories, but a small script, or even manual creation of the SRC DST paths with cmd to cut-n-paste in Excel, shouldn't be too hard. Also, if you want to rename something in the future you could avoid this work by stopping Harvest, doing the object rename on the cluster, rename the directories on the Graphite host, and start Harvest again. It's not ideal but unfortunately Graphite has no API to handle renames, so filesystem renames is the only option.
Cheers,
Chris Madden
Storage Architect, NetApp EMEA (and author of Harvest)
Blog: It all begins with data
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