(/proc/sys/dev/scsi/logging_level).
There is also a nice 'scsi_logging_level' script in the
S390-tools package, available for download at
- https://github.com/ibm-s390-tools/s390-tools/blob/master/scripts/scsi_logging_level
+ https://github.com/ibm-s390-linux/s390-tools/blob/master/scripts/scsi_logging_level
scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are
discovered. async scans them in kernel threads,