Learn about the z/OS command D M=DEV and how it can be used to display all paths to all devices on a mainframe system. Understand the syntax and usage with examples.
Table of Contents
Question
Which of the below command displaysall paths to all devices
A.D PATH
B. D PATHS, ALL
C. D M=DEV
D. None
Answer
C. D M=DEV
Explanation
The z/OS command “D M=DEV” (or “DISPLAY M=DEV”) is used to display information about all paths to all devices defined to the system. When executed, it shows a comprehensive list of available device paths.
The command syntax is: D M=DEV[(filterkey)]
Where the optional “filterkey” can be used to narrow down the displayed results to a specific device number or range.
Some key information provided by D M=DEV includes:
- Device numbers
- Device types (e.g. DASD, tape, console)
- Channel path IDs (CHPIDs) associated with each device
- Status of each device (online, offline, allocated, etc.)
Example output:
IEE174I 12.39.09 DISPLAY M 378 DEVICE 0B80 STATUS=ONLINE DEVICE 0B81 STATUS=OFFLINE DEVICE 0C80 STATUS=ALLOCATED ...
The other command options listed are incorrect:
– “D PATH” is not a valid z/OS command
– “D PATHS, ALL” is not a valid syntax
– “None” is incorrect since D M=DEV is the correct answer
In summary, D M=DEV is the z/OS command used to display comprehensive information about all device paths defined to the system, making it an essential tool for mainframe operators and administrators.
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