Add a System to the MIMplex when COMMUNICATION=CTCDASD

Advanced Topics › Product Activation Considerations › How You Dynamically Change CA MIM Communication Methods › Add a System to the MIMplex when COMMUNICATION=CTCDASD

Add a System to the MIMplex when COMMUNICATION=CTCDASD

This procedure dynamically adds a system to an existing MIMplex when COMMUNICATION=CTCDASD or CTCONLY.

Note: Be sure that your COMPATLEVEL is set to 12.0 or higher.

Follow these steps:

Set up your new system.

Review the current configuration.

In this example, we have a two system MIMplex with systems GK03 and GK13. We are going to add system GK62.

The current INIT member contains the following statements:

DEFSYS (GK03,03,XE03,INIT=FREED), 
             (GK13,13,XE13,INIT=FREED)

GLOBALVALUE VCFMASTER=(GK03,GK13),
            MOSTP=YES,
            NOMASTER=WAIT,
            ANYELIG=YES
CTCPATH FROMSYS=GK03 TOSYS=GK13 ADDR=(183A,154A,B3A)
CTCPATH FROMSYS=GK13 TOSYS=GK03 ADDR=(183A,154A,B3A)

Confirm the current configuration on GK13 using the DISPLAY command:

@D SYS
MIM0067I Command DISPLAY 355
MIM0108I SYSTEMS DISPLAY
   INDEX ALIAS SYSTEM   RELATION STATUS      OPSYS     LAST ACCESS
    01    03   GK03     EXTERNAL MASTER      zOS  2013.175 14:40:17.11 
    02    13   GK13     LOCAL    ACTIVE      zOS  2013.175 14:40:17.20

@D PATH
MIM0067I Command DISPLAY 359
MIM0176 MIM PATH DISPLAY: 
LAST RESTART AT  14:39:35 ON 2013.175
 DEV  SYSTEM   STATE   IO-STAT     READS   WRITES  ERR TIME/RSV  CYCLES
 N/A  GK13     LOCAL                    0        0                    0
>183A GK03     IN-USE  IDLE           305      305     0.001085     305
 154A GK03     USABLE  IDLE             0        0                    0
 0B3A GK03     USABLE  IDLE             0        0                    0

@D GLOBALV
MIM0067I Command DISPLAY 372
MIM0373I MIM GLOBALVALUE display:
   ANYELIGIBLE=YES       MOSTPREFERRED=YES     NOMASTER=WAIT
   VCFMASTER=( GK03, GK13 )
   ELIGIBLE MASTER LIST: GK03, GK13

Confirm the current configuration on GK03 using the DISPLAY command:

@D PATH
MIM0067I Command DISPLAY 237
MIM0176 MIM PATH DISPLAY:
LAST RESTART AT  14:39:23 ON 2013.175
 DEV  SYSTEM   STATE   IO-STAT     READS   WRITES  ERR TIME/RSV  CYCLES 
 N/A  GK03     LOCAL                    0        0     0.000024     624 
 183A GK13     USABLE  IDLE           621      621                    0 
 154A GK13     USABLE  IDLE             0        0                    0 
 0B3A GK13     USABLE  IDLE             0        0                    0

Activate the new system GK62 using the DEFSYS command on one system only:

@DEFSYS (GK62,62,XE62)
MIM0067I Command DEFSYS 319
MIM0099I DEFSYS command is processing
MIM0408I System Add Successful - GK62

Confirm that GK62 has been added successfully:

@D SYS
MIM0067I Command DISPLAY 327
MIM0108I SYSTEMS DISPLAY
   INDEX ALIAS SYSTEM   RELATION STATUS      OPSYS     LAST ACCESS
    01    03   GK03     LOCAL    MASTER      zOS  2013.175 14:44:03.55 
    02    13   GK13     EXTERNAL ACTIVE      zOS  2013.175 14:44:03.55 
    03    62   GK62     EXTERNAL FREED             <- new system

(Optional) Update the VCFMASTER parameter on the GLOBALVALUE statement. This list shows the systems from busiest to least busy (in terms of the global ENQ activity).

In this example, GK62 has the least amount of activity, so we want to put this system last in the list:

@GLOBALVALUE VCFMASTER(GK03,GK13,GK62) 
MIM0067I Command GLOBALVALUE 360
MIM0386W System GK62 is ineligible to become VCF MASTER
MIM0193I GLOBALVALUE command processing initiated
MIM0363I GLOBALVALUE command changes pending on external systems  
MIM0362I GLOBALVALUE command processing complete

Confirm the change:

@D GLOBALV
MIM0067I Command DISPLAY 367
MIM0373I MIM GLOBALVALUE display:
   ANYELIGIBLE=YES       MOSTPREFERRED=YES     NOMASTER=WAIT
   VCFMASTER=( GK03, GK13, *GK62 )
   ELIGIBLE MASTER LIST: GK03, GK13

GK62 becomes eligible when it is started.

Test the connectivity of the devices using the PROCCTC utility before you use the CTCPATH command.

Create the CTCPATH definitions on GK03 and GK13.

On GK03:

@CTCPATH FROMSYS=GK03 TOSYS=GK62 ADDR=(184A,180A,B4A)
MIM0067I Command CTCPATH 500
MIM0703I Path added for device 184A
MIM0703I Path added for device 180A
MIM0703I Path added for device 0B4A

Confirm the new paths:

@D PATH
MIM0067I Command DISPLAY 520
MIM0176 MIM PATH DISPLAY:
LAST RESTART AT  14:39:23 ON 2013.175
 DEV  SYSTEM   STATE   IO-STAT     READS   WRITES  ERR TIME/RSV  CYCLES
 0B4A GK62     USABLE  BUSY             0        0                    0
                       WRITHDS                                         
 180A GK62     USABLE  BUSY             0        0                    0
                       WRITHDS                                         
 184A GK62     USABLE  BUSY             0        0                    0
                       WRITHDS                                         
 N/A  GK03     LOCAL                    0        0     0.000055   4,980
 183A GK13     USABLE  IDLE         4,969    4,969                    0
 154A GK13     USABLE  IDLE             0        0                    0
 0B3A GK13     USABLE  IDLE             0        0                    0

On GK13:

@CTCPATH FROMSYS=GK13 TOSYS=GK62 ADDR=(187A,BFA,B7A)
MIM0067I Command CTCPATH 685
MIM0703I Path added for device 187A
MIM0703I Path added for device 0BFA
MIM0703I Path added for device 0B7A

Confirm the new paths:

@D PATH
MIM0067I Command DISPLAY 695
MIM0176 MIM PATH DISPLAY:
LAST RESTART AT  14:39:35 ON 2013.175
 DEV  SYSTEM   STATE   IO-STAT     READS   WRITES  ERR TIME/RSV  CYCLES 
 0B7A GK62     USABLE  BUSY             0        0                    0 
                       WRITHDS                                          
 0BFA GK62     USABLE  BUSY             0        0                    0 
                       WRITHDS                                          
 187A GK62     USABLE  BUSY             0        0                    0 
                       WRITHDS                                          
 N/A  GK13     LOCAL                    0        0                    0 
>183A GK03     IN-USE  IDLE         4,859    4,859     0.001026   4,859 
 154A GK03     USABLE  IDLE             0        0                    0 
 0B3A GK03     USABLE  IDLE             0        0                    0

Update the INIT member with the contents of the previous commands and add the CTCPATHs from GK62:

DEFSYS (GK03,03,XE03,INIT=FREED),
       (GK13,13,XE13,INIT=FREED),
       (GK62,62,XE62,INIT=FREED)

GLOBALVALUE VCFMASTER=(GK03,GK13,GK62), 
            MOSTP=YES,
            NOMASTER=WAIT,

CTCPATH FROMSYS=GK03 TOSYS=GK13 ADDR=(183A,154A,B3A)
CTCPATH FROMSYS=GK03 TOSYS=GK62 ADDR=(184A,180A,B4A)

CTCPATH FROMSYS=GK13 TOSYS=GK03 ADDR=(183A,154A,B3A)
CTCPATH FROMSYS=GK13 TOSYS=GK62 ADDR=(187A,BFA,B7A)	<-new

CTCPATH FROMSYS=GK62 TOSYS=GK03 ADDR=(184A,180A,B4A)
CTCPATH FROMSYS=GK62 TOSYS=GK13 ADDR=(187A,BFA,B7A)	<-new

Note: If COMM=CTCDASD, ensure that the control files or list structures are allocated or cataloged on the new system.

Start MIM on GK62:
```
S MIM,FORMAT=CHKPT
```
The new system joins the existing MIMplex.

Note: COMMUNICATION=CTCDASD does not require a checkpoint file. However, if you have one allocated due to using ECMF REQUEUE, then format it.

Verify that the new system joined the MIMplex by entering some verification commands on the new system/GK62:

@DCSF
MIM0023I system GK62 in file VCF synchronization COMPLETE
MIM0067I Command DISPLAY 676
MIM0108I SYSTEMS DISPLAY
   INDEX ALIAS SYSTEM   RELATION STATUS      OPSYS     LAST ACCESS
    01    03   GK03     EXTERNAL MASTER      zOS  2013.175 14:53:19.61
    02    13   GK13     EXTERNAL ACTIVE      zOS  2013.175 14:53:19.66
    03    62   GK62     LOCAL    ACTIVE      zOS  2013.175 14:53:19.67 

GK62 is now ACTIVE.

MIM0373I MIM GLOBALVALUE display:
   ANYELIGIBLE=YES       MOSTPREFERRED=YES     NOMASTER=WAIT
   VCFMASTER=( GK03, GK13, GK62 )
   ELIGIBLE MASTER LIST: GK03, GK13, GK62  

GK62 is now an eligible master.

MIM0176 MIM PATH DISPLAY:
LAST RESTART AT  14:52:58 ON 2013.175
 DEV  SYSTEM   STATE   IO-STAT     READS   WRITES  ERR TIME/RSV  CYCLES
 N/A  GK62     LOCAL                    0        0                    0
 187A GK13     USABLE  IDLE             0        0                    0
 0BFA GK13     USABLE  IDLE             0        0                    0
 0B7A GK13     USABLE  IDLE             0        0                    0
>184A GK03     IN-USE  IDLE             3        3     0.001479       3
 180A GK03     USABLE  IDLE             0        0                    0
 0B4A GK03     USABLE  IDLE             0        0                    0

All 6 CTC addresses have been allocated and 184A is the path currently IN-USE to the VCFMASTER(GK03).