The open source metrics software Graphite is brilliant. To get it up and running however is not so. The ‘official’ documentation is quite generic, and the packaged versions (on EPEL and via PIP) have their own issues on some Linux flavors. So I usually end up searching Google to hopefully find a working recipe for the Linux flavor of the day on someone’s blog. And when I’ve done that invariably it still doesn’t work.
Back in 2012 when NetApp first added SAN protocol support to clustered Data ONTAP I created a short video to show how easy and non-disruptive it is to move a volume (containing one or more LUNs) around in a cluster. Although a bit dated, the feature is as powerful as ever! From an operational perspective being able to move data without impacting users or reconfiguring clients is huge. If you want to re-balance for capacity or performance (including from spinning disk to hybrid to all-flash!