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When troubleshooting performance issues on a Netapp storage system, Perfstat is a very useful utility. There are other ways to get performance statistics, but they are not quite as detailed.
The perfstat file at first glance can be rather daunting. Perfstat files get very large, very fast, and may scare away the faint at heart. But, if you spend a little time looking them over, they start to make some sense.
For the purpose of this article I am going to focus on three areas which will help you to pinpoint the performance problem you be experiencing on your SAN; these areas are Disk, CPU, and Network.