The SCSI command set is designed to provide efficient peer-to-peer operation of input/output devices (disks, tapes, printers, etc.) by an operating system. The SCSI command set assumes a command-response protocol. Action on SCSI commands shall not be deemed completed until a response is received. The response shall include a status that indicates the final disposition of the command. The SCSI command set provides multiple operating systems concurrent control over one or more input/output devices. However, the multiple operating systems must properly coordinate their actions or data corruption will result. This standard defines commands that assist with coordination between multiple operating systems. This standard defines a device model for SCSI-3 storage arrays, the commands that may apply to SCSI-3 storage arrays, and the SCSI commands that are uniquely for SCSI-3 storage arrays.