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Brian Nordland

Brian Nordland

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Note

As part of this process, when configuring Geographic Mirroring between the first target system, the production copy of the IASP will need to be varied off.

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In environments where automatic failover is desired, it is possible to enhance automatic failover to monitor for additional events via a Hardware Management Console (HMC) using cluster monitors. See Advanced Node Failure Detection for additional information.

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Note

As part of this process, when configuring Geographic Mirroring between the first target system, the production copy of the IASP will need to be varied off. Configuring and deconfiguring Geographic Mirroring between additional nodes does not require the production IASP to be varied off.

  1. Vary off the IASP on the production system if it currently has a status of Available by using the VRYCFG command. For example: VRYCFG CFGOBJ(MYIASP) CFGTYPE(*DEV) STATUS(*OFF)

  2. Use the Configure Geographic Mirroring (CFGGEOMIR) command to configure Geographic Mirroring replication to the target node. For this example, the following command is used:

    Code Block
    CFGGEOMIR ASPDEV(MYIASP) 
          ACTION(*CREATE)
          DELIVERY(*ASYNC) 
          COMPRESS(*RESYNC)

    This command configures Geographic Mirroring for the IASP named MYIASP to the node MN02.
    Since MN02 is in a different site in the CRG from the production system, delivery can be either synchronous (*SYNC) or asynchronous (*ASYNC). In this example, *ASYNC is chosen.
    A value of *RESYNC is specified for transmission compression. Transmission compression can reduce the time required for initial synchronization and resynchronization and uses hardware-accelerated compression for Power10 and later systems. On systems prior to Power10, software compression is used. Compression can have higher CPU overhead on the production system.

  3. Since *SELECT was specified for the disk units, a panel showing all non-configured units is displayed on the target node, as shown below. Use option 1 to select the disk units you want from the list.

    Code Block
    PowerHA                Select Non-Configured Disk Units                       
                                                                              
ASP device . . . . . . :   MYIASP        Mirror copy node . . . :   WI01
Prod copy capacity . . :   28634         Mirror copy capacity . :   0         
Prod disk units  . . . :   3             Mirror disk units  . . :   0         
                                                                              
Type options, press Enter.                                                    
  1=Select                                                                    
                                                                              
     Resource                                                                 
Opt  Name        Serial Number    Type Model  Capacity  Rank  Eligible               
 1   DMP476      YF5258000079     2145 0050       9544  002      Yes          
 1   DMP481      YF525800007A     2145 0050       9544  002      Yes          
 1   DMP485      YF525800007B     2145 0050       9544  002      Yes          
                                                                       More...
F1=Help   F9=Calculate Selection   F11=View 2   F12=Cancel

    After confirming the selection, PowerHA will initialize and format the disk units on the target system, configure Geographic Mirroring, and create copy descriptions and a session to manage the replication. The default session name if *GEN is used is GEOMIRSSN.
    Since the default value for the start indicator parameter was left as *YES in the command, PowerHA will also start the cluster resource group, vary on the IASP on the production system, and start replication.

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