If you want to learn more details about this command, I highly recommend this article how to use nfsiostat on Linux.
The nfsiostat gets input from /proc/self/mountstats and provides information about the input/output performance of NFS shares mounted in the system.
We usually run this command this way nfsiostat 3 /mountpoint. 3 means 3s. It is the interval.
We can get the NFS performance metrics here like NFS IOPS, bandwidth, latency.
- avg RTT (ms) This is the duration from the time that client’s kernel sends the RPC request until the time it receives the reply.
- avg exe (ms) This is the duration from the time that NFS client does the RPC request to its kernel until the RPC request is completed, this includes the RTT time above.