xnperfstat: wrapping NetApp’s PerfStat Tool

Perfstat is a diagnostic data collection tool for NetApp filers. If and when they experience performance issues, NetApp Support will likely ask for perfstat to be run against the ailing filers. This is (hopefully) not something that is done often, and therefore, the details of how to run it may get rusty, which is problematic in the middle of an availability storm.

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