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

MODIFY CU / CNTLUNIT
Responses
Messages
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
configuration in the hardware system area (HSA). You should also change the
other part of the hardware’s view: the active I/O configuration data set (IOCDS)
file on the support element (SE) hard disk.
To change the IOCDS file on the SE hard disk, you must:
a. Update the IOCP source file.
b. Run the IOCP utility (see page 1849) against the updated IOCP file. If the
IOCP utility runs without errors, it downloads the new IOCDS file to the SE
hard disk.
c. Issue the SET IOCDS_ACTIVE command (see page 1258) to make the new
IOCDS file the active file that the processor will use during the next
power-on reset (POR).
4. For more information about changing control unit definitions in your I/O
configuration, see z/VM: I/O Configuration.
5. To define a new control unit on the system, use the DEFINE CU or CNTLUNIT
command. (See page 149.)
6. To delete an existing control unit on the system, use the DELETE CU or
CNTLUNIT command. (See page 221.)
Response 1:
To add unit addresses X'01' through X'1F' to existing control unit 1200, enter the
following:
modify cu 1200 add unit_address 01-1f
Control unit configuration change completed successfully
Ready;
Response 2:
To add a link address of X'F4' and a control unit logical address of X'00' to channel
path 19 on control unit 2F00, enter the following:
mod cu 2f00 add chpid 19 escon link_addr f4 cu_logical_addr 00
Control unit configuration change completed successfully
Ready;
Response 3:
To add access to existing control unit 1210 from an additional channel-subsystem
image, enter the following:
mod cu 1210 css 3 add_css chpid 9 link 43 cuadd 81 man 2
Control unit configuration change completed successfully
Ready;
HCP1006E Command processing cannot complete
because the system does not support
the logical-channel-subsystem facility.
HCP6805E Cannot find RDEV for TYPE 1
subchannel
608 z/VM: CP Commands and Utilities Reference
HCP6806E Dynamic I/O change request [for
channel path|for control unit|for
device] failed with return code nnnn
HCP6809E This processor does not support
dynamic I/O changes