Removing a CTCM group device

Red Hat Enterprise Linux 9.2 LPAR mode z/VM guest

Use the ungroup attribute to remove a CTCM group device.

Before you begin

The device must be set offline before you can remove it.

Procedure

To remove a CTCM group device, write 1 to the ungroup attribute.
Issue a command of the form: 
# echo 1 > /sys/bus/ccwgroup/drivers/ctcm/<device_bus_id>/ungroup

Example

This command removes device 0.0.2000: 
echo 1 > /sys/bus/ccwgroup/drivers/ctcm/0.0.2000/ungroup