Viewing CTC connections

HCD offers you the possibility to view and verify your CTC connections. You can view existing CTC connections including online diagnostic messages on the following lists:

• Processor List
• Partition List
• Channel Path List
• Control Unit List
• I/O Device List

The CTC Connection List lets you immediately verify whether your definitions are done correctly.

ESCON channel-to-channel support

An ESCON CTC connection requires a CTC channel at one end of the connection and a CNC or FCV channel at the other end of the connection. The two channels can be considered as communicating directly with each other in a peer-to-peer fashion. Each channel defines the channel at the other end of the CTC connection as an SCTC control unit. This is illustrated in Figure 67.

FICON channel-to-channel support

FCTC support differs from ESCON CTC support not only in the channel types used. The main differences are as follows:

• An FCTC connection is given via a FICON channel path on each side of the FCTC communication line.
• It is possible to have an FCTC connection between the LPARs of the same CEC via a single FICON channel path in a switched environment.

In order to be usable as an FCTC connection channel, a FICON channel path must be defined to an FCTC control unit which is connected to FCTC devices.

Figure 67. CTC/CNC connection established using a dynamic connection

The entry port of the channel at the other end of the CTC connection corresponds to the link address of the control unit representing the channel.

The CTC devices associated with the control units at both ends of the CTC connection may have different device numbers, but they must have the same unit address. The device type of both devices must be the same (for example, SCTC or BCTC).

Restrictions applying to the CTC Connection List

• HCD can only show CTC connections if the connected processors are defined in one IODF.
• For a switched SCTC connection, the CNC/FCV and CTC channel paths must be connected to the same ESCON director. CTC connections running via chained ESCON directors cannot be determined.
• CTC connections using a stand-alone CTC adapter cannot be shown.
• Point-to-point CTC connections are only recognized if the control units associated to a specific CTC connection have the same serial number defined.

CTC connections with shared channels

If your processor has MIF support you can share your channels among several partitions to save physical connections. The following figure shows you the case when a CNC channel is shared between two partitions. The CTC channel will need a separate control unit definition for each partition sharing the CNC channel. Each of these control unit definitions has the same destination link address but the control unit logical addresses (CUADD) must be different. The control unit logical address must correspond to the image number of the logical partition.

Figure 68. CTC/CNC connection established using shared channels

For further specification rules, refer to the IOCP User's Guide for your processor.

How to view CTC connections

You can use action View related CTC connections (or action code  k ) on the following lists:

• Processor List
• Partition List
• Channel Path List
• Control Unit List
• I/O Device List

A panel similar to the following one is displayed:

  Goto  Filter  Backup  Query  Help
------------------------------------------------------------------------------
                             CTC Connection List     Row 1 of 14 More:       >

Select CTC connections to view CTC Messages, then press Enter.

  -----------CTC or FC side---------- ---------CNC/FCV or FC side--------
/ Proc.CSSID Part.    Devices CH CU   Proc.CSSID Part.    Devices CH CU   Msg.

_ PROC001A            0500,5  20 1020 PROC001             0100,5  10 1010 G750
_ PROC001A            0690,1  20 0069                                     G752
_ PROC002             0650,1  11 0065 PROC002             0660,1  13 0066 G753
_ PROC002             0680,1  11 0068                                     G752
_ PROC002             0701,1  12 0050 PROC003    PART1    0301,1  10 1012
_ PROC002             0800,5  22 0060 PROC003    PART2    0400,5  11 1013
_ PROC002             0805,1  22 0060 PROC003    PART2    0405,1  11 1013 G751
_ PROC002             0806,3  22 0060 PROC003    PART2    0406,3  11 1013
_ PROC002             2400,1  24 0024                                     G756
_ XMP1.1     PART1    1105,1  21 0105 PROC001             1106,1  10 0106
_ XMP1.1     PART1    1107,1  21 0107 PROC002             1108,1  26 0108 G750
                                      PROC002             0200,2  10 1011 G757
                                      XMP1.1     PART1    0300,1  10 1012 G754
                                      XMP1.1     PART2    0300,2  10 1012 G754

This panel shows the definitions of the CNC/FCV side in relation to the definitions of the CTC side, such as processor, partition, channel path, control unit, and device information.

Incomplete CTC definitions

If the CTC connection is not correctly defined, the fields on the CTC Connection List can be incomplete and an error message is shown. For example, G754 in column Msg. refers to message CBDG754I, which indicates that HCD cannot determine the connection, because no control units and devices match to the processor, partition, control unit, and device of the same row.

Displaying more detailed information

Scroll to the right to see more detailed information about the CTC side of the connection, such as channel path mode, switch information, detailed control unit and device information.

  Goto  Filter  Backup  Query  Help
-------------------------------------------------------------------------
                       CTC Connection List (CTC/FC)     Row 1 of 14 More: <>

Select CTC connections to view CTC Messages, then press Enter.

             -Partition-- ----Devices-----    -CHPID- Entry Dyn      Link CU
/ Proc.CSSID Name     Num Number   Type OS UA ID Mode SW PO SW  CU   Addr ADD
_ PROC001A                0500,5   BCTC N  00 20 DED  05 F0 05  1020 E120
_ PROC001A                0690,1   SCTC N  00 20 DED  05 F0 05  0069 E728
_ PROC002                 0650,1   SCTC N  00 11 DED  05 E7 05  0065 E840
_ PROC002                 0680,1   SCTC N  00 11 DED  05 E7 05  0068 F0
_ PROC002                 0701,1   SCTC N  01 12 DED  05 D0 05  0050 F4   1
_ PROC002                 0800,5   SCTC N  00 22 DED  05 D7 05  0060 F3   2
_ PROC002                 0805,1   BCTC N  05 22 DED  05 D7 05  0060 F3   2
_ PROC002                 0806,3   SCTC N  06 22 DED  05 D7 05  0060 F3   2
_ PROC002                 2400,1   SCTC N  00 24 DED  04 E0 05  0024 E0
_ XMP1.1     PART1      1 1105,1   SCTC N  00 21 DED  05 F7 05  0105 E1
_ XMP1.1     PART2      2 1107,1   SCTC N  00 21 DED  05 F7 05  0107 F8

Scroll once again to the right to see the same detailed information for the CNC/FCV side of the connection.

  Goto  Filter  Backup  Query  Help
-------------------------------------------------------------------------
                      CTC Connection List (CNC/FCV/FC)     Row 1 of 14 More: <

Select CTC connections to view CTC Messages, then press Enter.

             -Partition-- ----Devices-----    -CHPID- Entry Dyn      Link CU
/ Proc.CSSID Name     Num Number   Type OS UA ID Mode SW PO SW  CU   Addr ADD

_ PROC001                 0100,5   BCTC N  00 10 DED  05 E1 05  1010 F0   0
_
_ PROC002                 0660,1   SCTC N  00 13 DED  05 E8 05  0066 E7
_
_ XMP1.1     PART1      1 0301,1   SCTC N  01 10 SHR  05 F4 05  1012 D0
_ XMP1.1     PART2      2 0400,5   SCTC N  00 11 SHR  05 F3 05  1013 D7
_ XMP1.1     PART2      2 0405,1   SCTC N  05 11 SHR  05 F3 05  1013 D7
_ XMP1.1     PART2      2 0406,3   SCTC N  06 11 SHR  05 F3 05  1013 D7
_
_ PROC001                 1106,1   SCTC N  00 10 DED  05 E1 05  0106 F7
_ PROC002                 1108,1   SCTC N  00 26 DED  05 F8 05  0108 F7   1
_ PROC002                 0200,2   SCTC N  00 10 DED            1011 C5
_ XMP1.1     PART1      1 0300,1   SCTC N  00 10 SHR  05 F4 05  1012 D0
_ XMP1.1     PART2      2 0300,2   SCTC N  00 10 SHR  05 F4 05  1012 D0

Filtering CTC definitions

To get a better overview of your CTC connections you can filter the list by specifying different filter criteria. Select action bar Filter and then Set filter. The following panel appears:

*-------------------------- Filter CTC Connections ---------------------*
|                                                                       |
|                                                                       |
| Specify or revise the following filter criteria and press Enter.      |
|                                                                       |
| Message ID  . . . . _____                                             |
| Device type . . . . ____  (SCTC/BCTC/FCTC)                            |
| Dynamic switch  . . __  +                                             |
|                                                                       |
| CTC or FC side                      CNC/FCV or FC side                |
| Processor.CSSID . . __________  +   Processor.CSSID . . __________  + |
| Partition . . . . . ________    +   Partition . . . . . ________    + |
| CHPID . . . . . . . __              CHPID . . . . . . . __            |
|                                                                       |
| CU number . . . . . ____          CU number . . . . . ____            |
| Starting device no. ____          Starting device no. ____            |
| Defined to OS . . . _  (Y/N)      Defined to OS . . . _  (Y/N)        |
*-----------------------------------------------------------------------*

Printing CTC connection lists

You can also print the list panel using the SAVE command as described in How to print list panels.

Displaying diagnostic messages

Select one or more CTC connections and press the Enter key to display diagnostic messages for the connections.

For each connection, HCD displays one message, even if the connection includes several errors. HCD displays the messages according to the following priority list:

A message list may look as follows. The messages are sorted by severity.

   Save  Query  Help
 ------------------------------------------------------------------------
                                Message List                     Row 1 of11
 Command ===> __________________________________________ Scroll ===> PAGE

 Messages are sorted by severity. Select one or more, then press Enter.

 / Sev Msg. ID  Message Text
 _ E   CBDG750I Logical address (CUADD) is specified for CU 1010,
 #              but CHPID 20 of processor PROC001A is not defined as
 #              shared.
 _ E   CBDG752I Channel path type error. CHPID 20 of processor PROC001A
 #              is connected to CHPID 11 of processor PROC002 with the
 #              same type.
 _ W   CBDG753I Wrap around connection detected for processor PROC002
 #              (partition - none -) via CHPID 11 and CHPID 13.
 _ I   CBDG756I HCD cannot determine connection. CHPID 24 of processor
 #              PROC002 is connected via chained switches.