Chapter 10. Configuring a persistent qeth device on IBM Z

Procedure

1. Unmask the device IDs of the qeth device:

   • If you know the device IDs, unmask these IDs. For example:

     # cio_ignore --remove 0.0.0600,0.0.0601,0.0.0602

     Specify the device IDs comma-separated as shown or as a range, for example 0.0.0600-0.0.0602.

   • If you do not know the device IDs, you can unmask all IDs:

     # cio_ignore --remove-all

2. Display the available qeth devices:

   # lszdev qeth

   TYPE  ID                         ON  PERS  NAMES
   qeth  0.0.0600:0.0.0601:0.0.0602 no  no

   The output contains the following columns:

   • TYPE: Displays the device type. If you ran lszdev qeth, the command returns only qeth devices.
   • ID: Displays the subchannel addresses of the hardware. This is a triplet of three hexadecimal addresses used for read, write, and data transfers.
   • ON: Indicates the current operational state of the device where no means that the driver has not yet grouped the channels and created a functional network device.
   • PERS: Indicates the persistence status of the configuration where no confirms that no udev device manager rule exists and, therefore, the device is not automatically be enabled after a reboot.
   • NAMES: Displays the network interface name you can use in NetworkManager. If the field is empty, the channels have not been grouped or set online yet.

3. Create a udev rule and activate the qeth device:

   # chzdev qeth 0.0.0600 -e

   You can specify only the first address of a triplet, and the chzdev utility automatically detects the associated write and data channels.