LUN reset - Resets the specified LUN by clearing any SCSI reservation on the LUN and making the LUN available to all servers again. The reset does not affect any of the other LUNs on the device. If another LUN on the device is reserved, it remains reserved.
Target reset - Resets the entire target. The reset clears any SCSI reservations on all the LUNs associated with that target and makes the LUNs available to all servers again.