Do you use 4-digit device addresses in z/VSE ?
Ingolf24 120000DRN3 Visits (4996)
4-digit device address were introduced in z/VSE 4.3 - a long standing customer requirement.
In VSE releases before z/VSE 4.3, VSE devices needed to be configured with 3-digit device addresses in I/O configuration. Especially for environments that run different operating environments (z/OS, Linux, z/VM) that caused problems, because the z/VSE restriction of the 3-digit device addresses were often not considered and needed to be adjusted..
Starting with z/VSE 4.3 that restriction is resolved and you can configure devices like you do for the other System z operating systems.
z/VSE IPL accepts 4 digit (physical) device addresses which will be mapped to 3-digit device addresses during the IPL process. After the IPL complete message only 3-digit device address are used in most cases. That approach reduced the effort for the 4-digit device addresses implementation and is transparent to applications, IBM and vendor products. Only a few system management functions had to be adapted.
The mapping can be done via the IPL ADD statement
or the IUI dialog - Hardware Configuration: Unit Address List:
z/VSE Function Selection -> 2 - Resource Definition -> 4 - Hardware Configuration and IPL -> 1 - Configure Hardware
How can you find the mapping of the physical 4 digit to the 3 digit devices ?
1) via the above dialog
2) via the QUERY command
We introduced a command - QUERY IO,CUU=<device address> or ALL to display the mapping of the physical 4-device addresses to the 3-digit device addresses.
If you can't remember the command syntax just use the PF key 11 on the system console:
Set the cursor to any figure on the console screen, press PF11 (11=PCUU).
In the sample screen below I positioned the cursor to any partition begin address and pressed PF11.
You will see in the command line QUERY IO,CUU=500. Now you can replace "500" to the device address you want to see the mapping for or to "ALL" for the mapping of all devices.
QUERY IO,CUU=ALL results in the following display:
It's again weekend :-) Enjoy !