New NFS Metrics
Local disk usage and NFS usage are functionally interchangeable, so Solaris 2.6 was changed to instrument NFS client mount points as if they were disks! NFS mounts are always shown by iostat and sar. Automounted directories coming and going more often than disks coming online may be an issue for performance tools that don’t expect the number of iostat or sar records to change often.
The full instrumentation includes the wait queue for commands in the client (biod wait) that have not yet been sent to the server; the active queue for commands currently in the server; and utilization (%busy) for the server mount point activity level. Note that unlike the case with disks, 100% busy does not indicate that the server itself is saturated, ...
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