z/VM: CP Commands and Utilities Reference - z/VM - IBM

DELETE CU / CNTLUNIT
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Notes:
DELete
Authorization
Purpose
Operands
Usage Notes
CU
CNTLUNIT
nnnn
CSS 0
CSS
Privilege Class: B
nn
TYpe
(1)
CF
1 The old form of this operand, CFS, is still supported for compatibility.
DELETE CU / CNTLUNIT
Use DELETE CU or CNTLUNIT to delete an existing control unit from the I/O
configuration.
nnnn
is the number of the control unit that you want to delete. The variable nnnn
must be a 1- to 4-digit hexadecimal number between X'0000' and X'FFFE'.
CSS nn
is the channel-subsystem ID from which the control unit is to be deleted. The
variable nn must be a 1- to 2-digit hexadecimal number between X'00' and
X'0F'. See Usage Note 2.
Note: This parameter and other parameters that identify different
channel-subsystem IDs require that the logical channel-subsystem facility
be installed.
TYpe CF
tells CP that this control unit is connected to coupling facility channel paths.
Coupling facility channel paths include coupling facility sender (CFS), coupling
facility receiver (CFR), coupling facility peer (CFP), cluster bus sender (CBS),
cluster bus receiver (CBR), cluster bus peer (CBP), or internal coupling peer
(ICP) channel paths.
1. Before you can delete a control unit, you must delete all devices attached to
that control unit. To delete a device from a control unit, use the DELETE
DEVICE or IODEVICE command.(See page 223.)
2. On a machine with multiple logical channel-subsystem images, the DELETE CU
and DELETE CNTLUNIT commands are effective only for control units in a
single channel-subsystem image. To delete control units that are in more than
one channel susbystem image, you must first enter MODIFY CU or MODIFY
CNTLUNIT commands to remove all but one channel-subsystem image. Then a
DELETE CU or DELETE CNTLUNIT command can be entered.
3. After successfully entering this command, you will have changed the software’s
view of the I/O configuration and part of the hardware’s view: the active I/O
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Chapter 2. CP Commands 221