a SCSI device reset is attempted
a SCSI bus reset is attempted. Note this may have an adverse effect on other devices sharing that SCSI bus.
a SCSI host (bus adapter) reset is attempted. This is an attempt to re-initialize the adapter card associated with the SCSI device that has the timed out command.
The two error statuses containing the word "TIME(_)OUT" are typically _not_ related to a command timing out. DID_TIME_OUT in the 'host_status' usually means an (unexpected) device selection timeout. DRIVER_TIMEOUT in the 'driver_status' byte means the SCSI adapter is unable to control the devices on its SCSI bus (and has given up).
The type of timeout is unsigned int (and it represents milliseconds).
[1] | Whether aborting individual commands is supported or not is left to the adapter. Many adapters are unable to abort SCSI commands "in flight" because these details are handled in silicon by embedded processors in hardware. SCSI device or bus resets are required. |