Examples

Red Hat Enterprise Linux 8.6 z/VM guest

These examples illustrate common scenarios for unit record devices.

In all examples the following device nodes are used:

/dev/vmrdr-0.0.000c as virtual reader.
/dev/vmpun-0.0.000d as virtual punch.

The vmur commands access the reader device, which has to be online. To set it online, it needs to be freed from cio_ignore. Example:

# cio_ignore -r c
# chccwdev -e c
Setting device 0.0.000c online
Done

Besides the vmur device driver and the vmur command, these scenarios require that the vmcp and vmconvert commands from the s390utils package are available.