This statistic shows NFSv[2-4] bytes/sec transferred between NFS clients and the appliance. Supported NFS versions are: NFSv2, NFSv3, NFSv4.0, and NFSv4.1. Bytes statistics can be broken down by: operation, client, filename, share, and project.
NFSv[2-4] bytes/sec can be used as an indication of NFS load. The best way to improve performance is to eliminate unnecessary work, which may be identified through the client and filename breakdowns, and the filename hierarchy view. Client and especially filename breakdowns can be very expensive in terms of storage and execution overhead. Therefore, it is not recommended to permanently enable these breakdowns on a busy production appliance.
These breakdowns can be combined to produce powerful statistics. For example, use "Protocol: NFSv3 bytes per second for client hostname.example.com broken down by filename" to view which files a particular client is accessing.
See Network: Device Bytes for a measure of network throughput caused by the NFS activity; Cache: ARC Accesses to learn how well an NFS read workload is returning from cache; and Disk: I/O Operations for the back-end disk I/O caused.