Patent ID: 7974215

Claim:
A system for network diagnosis, comprising: a library comprising a data storage drive coupled to a network, wherein the data storage drive is operable to process SCSI commands; an infusion device coupled to the network upstream of a portion of the network relative to the data storage drive and configured to infuse control data into the network at an infused data transfer rate, wherein the data storage drive is configured to store the infused control data; and a monitoring appliance coupled to the network and configured to send one or more Log Sense (LS) commands or Inquiry commands to the data storage drive over the network, wherein the monitoring appliance is further configured to: calculate a first data transfer rate of the infused data corresponding to data infused at a first known location upstream of a portion of the network relative to the data storage drive based on information returned from the data storage drive in response to the commands; calculate a second data transfer rate of the infused data corresponding to data infused at a first known location downstream of a portion of the network relative to the data storage drive based on information returned from the data storage drive in response to the commands; and compare the first infused data transfer rate to the second infused data transfer rate to determine the throughput of the portion of the network between the first known location and the second known location.