# scsi_logging_level
# set and get the SCSI logging level (install sg3-utils)

# configure the log level of several tracepoints along the Linux SCSI stack
scsi_logging_level -s --ioctl=7

# track SCSI commands as they flow through
# the SCSI submission and completion path
# (call dmesg after that)
scsi_logging_level -s --midlevel=7