This statistic shows logical access to the ZFS file system as operations/sec. Logical I/O refers to the type of operations as those that are requested to the file system, such as by NFS; as opposed to physical I/O, which are the requests by the file system to the back-end pool disks.
When to Check ZFS Logical I/O Operations
This could be useful while investigating how I/O is processed between the Protocol layer and pool disks.
ZFS Logical I/O Operations Breakdowns