IBM B50 - Manual (Page 207)

Flag Description
-l Physical disk channel/ID (i.e. 27)
Physical Disk Certify
Usage: diag -c -d <deviceName> -T "certify -l <ChId>"
Flag Description
-l Physical disk channel/ID (i.e. 23)
Physical Disk Identify
Usage: diag -c -d <deviceName> -T "identify"
7318 Serial Communications Network Server Service Aid
This service aid provides a tool for diagnosing terminal server problems.
Chapter 9. Introducing Tasks and Service Aids 9-35