Defining control units
You need two steps to define a control unit:
- Define the control unit characteristics
- Define how the control unit is attached to processors.
Before you define a control unit, you should have defined the processors
and channel paths to which the control unit is to be attached.
Defining the control unit characteristics
- On the Primary Task Selection panel, select Define, modify,
or view configuration data and on the resulting panel the object Control units. HCD displays the Control
Unit List showing all control units currently defined in the IODF.
Goto Filter Backup Query Help
------------------------------------------------------------------------------
Control Unit List Row 145 of 339
Command ===> _______________________________________________ Scroll ===> CSR
Select one or more control units, then press Enter. To add, use F11.
---#---
/ CU Type + CUADD CSS MC Serial-# + Description
_ 5E00 2105 6 5 28641 SUBCSE - S/N 28641
_ 5F00 2105 7 5 28641 SUBCSE - S/N 28641
_ 6000 2107 0 5 54321 SUBSQ02 - S/N 54321
_ 6100 2107 1 5 54321 SUBSQ02 - S/N 54321
_ 6200 2107 2 5 54321 SUBSQ02 - S/N 54321
_ 6300 2107 3 5 54321 SUBSQ02 - S/N 54321
_ 6400 2107 4 5 54321 SUBSQ02 - S/N 54321
_ 6500 2107 5 5 54321 SUBSQ02 - S/N 54321
F1=Help F2=Split F3=Exit F4=Prompt F5=Reset F7=Backward
F8=Forward F9=Swap F10=Actions F11=Add F12=Cancel F13=Instruct
F22=Command
Column CUADD shows the CUADD value
defined for the control unit, where available. If the CUADD is inconsistently
set for the control unit among processors, an * is displayed.
Column #CSS shows the number of channel subsystems to
which a control unit is connected. This column contains a value only
if a connection exists.
Column #MC shows the greater of the
number of managed channel paths defined for the connected processors
or the number of managed channel paths defined for the selected processor
when coming down from the processor. This column contains a value
only if managed channel paths are defined for the control unit.
Note:
The CF control units generated when connecting CF channel
paths are listed but are disabled for any action. It is not possible
to add a new such control unit via this dialog.
- Use F11=Add to define a new control unit. The data-entry fields
are shown below, with sample data:
*-------------------------- Add Control Unit --------------------------*
| |
| |
| Specify or revise the following values. |
| |
| Control unit number . . . . 00D1 + |
| Control unit type . . . . . 3990-3_______ + |
| |
| Serial number . . . . . . . __________ |
| Description . . . . . . . . DASD control unit_______________ |
| |
| Connected to switches . . . __ __ __ __ __ __ __ __ + |
| Ports . . . . . . . . . . . __ __ __ __ __ __ __ __ + |
| |
| If connected to a switch: |
| |
| Define more than eight ports . . 2 1. Yes |
| 2. No |
| |
| Propose CHPID/link addresses and |
| unit addresses . . . . . . . . . 2 1. Yes |
| 2. No |
*----------------------------------------------------------------------*
Defining switch connections
The Add Control Unit panel can also
be used to specify the switches and ports the control unit is attached
to.
If you specify Yes for Define more than
eight ports, the Define Control Unit
Ports dialog will be displayed to allow you to specify up to
64 control unit/switch port connections. To connect a unit to a maximum
of 128 switch ports, in this dialog, you can invoke another panel
to define an additional 64 switch port connections.
If you specify Yes for Propose CHPID/link addresses
and unit addresses and the control unit is connected to at least
one switch, HCD suggests control unit to processor attachment parameters
(channel path/link addresses and the unit address range) based on
the switch/ports the control unit is connected to. HCD will propose
up to eight channel path/link address pairs, starting with the channel
path that has the lowest number of devices attached to it.
If you add a new control unit (via Add or Add-like), HCD automatically
assigns as many logical paths as possible for all processors defined.
The following prerequisites must be fulfilled for this function:
- The control unit must support ESCON or FICON attachments and not
be used for channel-to-channel (CTC) connections.
- The control unit must have physical switch / port connections
(switch entry ports) defined.
- Channel paths that use the connected switch as a dynamic switch
must exist.
HCD then automatically selects the channel paths and link addresses
according to the following rules for each processor that has been
defined.
- All channel paths that use a switch that connects to the control
unit as a dynamic switch are candidates for assignment.
- The channel paths are sorted ascending by the value of the reversed
channel path ID. The resulting sequence is again sorted ascending
by the number of connected devices.
- The connected control unit ports are ordered ascending by the
numbers of already connected control units and path connections, respectively.
- For each connected switch port in the resulting sequence, the
channel paths are tested in sequence. If the switch port can be used
as a link address, the CHPID/link address is taken.
- A maximum number (up to 8) of possible CHPID/link address combinations
is assigned.
On the following Select Processor/Control
Unit panel you can type over the fields that are different from
the suggested attachment values.
Defining processor attachment data
- After pressing the Enter key on the Add Control Unit panel HCD
displays a list that shows all the defined processors. You can then
define how the control unit is to be attached to one or more processors.
Figure 54. Select Processor / Control Unit (1)
Select Processor / CU Row 3 of 5 More: >
Command ===> _______________________________________________ Scroll ===> CSR
Select processors to change CU/processor parameters, then press Enter.
Control unit number . . : 0000 Control unit type . . . : 3422
---------------Channel Path ID . Link Address + ---------------
/ Proc.CSSID 1------ 2------ 3------ 4------ 5------ 6------ 7------ 8------
_ XMPP01.0 09.0122 14.01A2 46.0222 52.02A2 33.0422 84.04A2 _______ _______
_ XMPP01.1 33.0422 84.04A2 0A.0522 14.05A2 _______ _______ _______ _______
_ XMPP01.2 33.0422 09.0722 14.07A2 _______ _______ _______ _______ _______
_ XMPP01.3 33.0422 84.04A2 0A.0522 14.05A2
Figure 55. Select Processor / Control Unit (2)
Select Processor / CU Row 3 of 5 More: < >
Command ===> _______________________________________________ Scroll ===> CSR
Select processors to change CU/processor parameters, then press Enter.
Control unit number . . : 0000 Control unit type . . . : 3422
CU --------------Unit Address . Unit Range + -------------
/ Proc.CSSID Att ADD+ 1----- 2----- 3----- 4----- 5----- 6----- 7----- 8-----
_ XMPP01.0 Y 00 00.256 ______ ______ ______ ______ ______ ______ ______
_ XMPP01.1 Y 00 00.256 ______ ______ ______ ______ ______ ______ ______
_ XMPP01.2 Y 00 00.256 ______ ______ ______ ______ ______ ______ ______
_ XMPP01.3 Y 00 00.256 ______ ______ ______ ______ ______ ______ ______ A Y for Yes in the Att column indicates
that the control unit is attached to the processor.
- Select a processor and the Select (connect/change) action
from the context menu (or action code s ).
When
a control unit is attached to multiple processors, you can use the Group connect action from the context menu
(or action code g ). This group action is particularly
useful when performing symmetric changes, for example, on CPCs defined
in a System z cluster. The changes are applied
to all selected processors, when you issued the change action against
a group of processors.
When you issue a change or group connect
action, the following panel for processor-dependent control unit information
is displayed:
*----------------------------- Add Control Unit -------------------------------*
| |
| |
| Specify or revise the following values. |
| |
| Control unit number . : 0099 Type . . . . . . : 2105 |
| Processor ID . . . . . : FR38LPAR Raised floor production |
| Channel Subsystem ID . : |
| |
| Channel path IDs . . . . 07 08 * * * __ __ __ + |
| Link address . . . . . . 80__ 81__ ____ ____ ____ ____ ____ ____ + |
| |
| Unit address . . . . . . __ __ __ __ __ __ __ __ + |
| Number of units . . . . ___ ___ ___ ___ ___ ___ ___ ___ |
| |
| Logical address . . . . __ + (same as CUADD) |
| |
| Protocol . . . . . . . . __ + (D,S or S4) |
| I/O concurrency level . 2 + (1, 2 or 3) |
| |
*------------------------------------------------------------------------------*
- On the Add Control Unit panel specify the channel paths
that connect the control unit to the processor.
If the control
unit is attached to a switch, you have to define a link address for
each channel path. The link address is the port to which the control
unit attaches. If the control unit attaches only to one port, the
link address is the same for each channel. For addressing the target control unit
in a fabric containing cascade switching, a two-byte link address
is used, which specifies as first byte the switch address and as second
byte the port address to which the control unit is attached.
For a
description what the link address is, see Figure 69, Figure 70 and Figure 72.
Note:
For managed control units, i.e., control
units that can have managed channel paths assigned by DCM, you must
indicate how many managed channel paths can be connected to the control
unit. Enter at least one static channel path and the corresponding
link address, and, in addition, an * (instead of the channel path
ID and link address) for each managed channel path.
You
must also specify the unit address and the number of units, that is
the unit address range of I/O devices that the control unit recognizes.
Serial control units may have specified only one unit address range
starting with 00.
If
the path to the control unit is not unique, and more than one serial
control unit connects to the same channel path via the same link address,
you have to specify a logical address (CUADD parameter). For more
information refer to the explanation of the CUADD in the IOCP User's Guide for your processor.
- Press the Enter key. HCD displays the updated Select Processor/Control
Unit panel. There you may scroll to the right (using F20=Right) to
see the data that you have entered on the previous panel.
- Repeat defining processor attachment data for all processors the
control unit should be attached to.
- Press the Enter key to return to the Control Unit List.
Upgrading to two-byte link addresses
In a FICON fabric, all one-byte link addresses on a channel path
may need to be migrated to a two-byte link address. HCD supports this
definition change via the Change Channel Path Link Addresses dialog.
If you specify a two-byte link address on a control unit for a specific
channel path, and there are already one-byte link addresses specified
on that path, the panel shown in Figure 56 appears.
This panel shows all link addresses specified for the specific
channel path that must be changed. If there has been an entry switch
defined for the channel, its ID and switch address (if defined) are
displayed; else the displayed information is taken from the dynamic
switch.
You can change the switch address. HCD then uses the modified
value to preset the two-byte link addresses in the displayed New column.
Its value is stored, if the entry switch is defined. Alternatively,
the new two-byte link addresses can be entered.
Pressing Enter will change the control unit link addresses on the corresponding control units.
Figure 56. Change Channel Path Link Addresses
Change Channel Path Link Addresses
Command ===> __________________________________________ Scroll ===> PAGE
Specify or revise the following values.
Processor ID . . . . . : MCSS01
Channel Path ID . . . : 81
Entry Switch ID . . . : B0
Switch Address . . . . . 26
Control Unit -- Link Address --
Number CSSID Current New
6000 0 02 2602
6200 1 03 2603
6400 1 04 2604
6600 1 05 2605
7000 2 09 2609
0E06 2 FE 26FE
***************************** Bottom of data ***************************
F1=Help F2=Split F3=Exit F5=Reset F7=Backward
F8=Forward F9=Swap F12=Cancel F22=Command
You may want to change link addresses from two byte to one byte.
This is possible, as long as all affected control units are attached to the
channel path switch. If a defined two-byte link address is changed
to a one-byte link address on a given channel path, all other two-byte
link addresses defined for control units attached to that channel have to
be changed to a one-byte link address also.
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z/OS HCD User's Guide
Copyright IBM Corporation 1990, 2014