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

Purpose
Operands
MODIFY CU / CNTLUNIT
Use MODIFY CU or CNTLUNIT to change the definition of an existing control unit in
the I/O configuration.
nnnn
is the number of the control unit that you are changing. The variable nnnn must
be a 1- to 4-digit hexadecimal number between X'0000' and X'FFFE'.
CSS nn
is the channel-subsystem image in which the control unit is to be modified. The
variable nn must be a 1- to 2-digit hexadecimal number between X'00' and
X'0F'.
Note: This parameter and other parameters that identify different
channel-subsystem IDs require that the logical channel-subsystem facility
be installed.
ADD
tells CP that you want to add one or more channel paths or unit addresses to
this control unit.
DELete
tells CP that you want to delete one or more existing channel paths or unit
addresses from this control unit.
Note: You cannot use the DELETE operand to delete all of the existing
channel paths or unit addresses from this control unit. To delete all of the
existing channel paths, use the DELETE CHPID or PATH command.
(See page 218.) To delete all of the existing unit addresses, use the
DELETE CU or CNTLUNIT command. (See page 221.)
ADD_CSS_access
tells CP that you want to add the control unit to the specified
channel-subsystem image. See Usage Note 1.
DELETE_CSS_access
tells CP that you want to delete the control unit from the specified the
channel-subsystem image. See Usage Note 2.
MANaged_paths n
tells CP that you want to modify the maximum number of managed channnel
paths which can be attached to the specified control unit or, for an
ADD_CSS_access request, is the maximum number of managed channel paths
in the specified channel-subsystem image that can be attached to the specified
control unit. The variable n must be a 1-digit decimal number from 0 to 7.
Note: The number of MANaged_paths plus the number of static paths attached
to the specified control unit cannot exceed 8.
CHPID nn
PATH nn
tells CP which channel paths you want to add to or delete from this control unit
or, for an ADD_CSS_access request, identifies the channel paths in the
specified channel-subsystem image associated with this control unit. You can
specify up to 8 channel path IDs. The variable nn must be a 1- to 2-digit
hexadecimal number between X'00' and X'FF'.
Chapter 2. CP Commands 605