Other IOPS are anything not read/write (metadata generally) and each request on the wire is accounted as one IOP in ONTAP For more information see Why does the sum of all volume IOPs in an aggregate n...Other IOPS are anything not read/write (metadata generally) and each request on the wire is accounted as one IOP in ONTAP For more information see Why does the sum of all volume IOPs in an aggregate not match the aggregate IOPs? The commands for qos statistics and the workload objects for statistics, as well as other commands are all user IOPS. A list of NFS and CIFS operations, and link to Wikipedia SCSI codes are on this article: What operations are categorized under Other IOPS in ONTAP?
