Scenario: typical usage for the CLI

The main focus of the following example is to provide storage to your host system using the command-line interface (CLI). In this instance, the CLI is the CLI available using the clustered system Internet Protocol (IP), not the CLI used available using the service IP. (The CLI available using the clustered system IP uses svctask and svcinfo commands and the CLI available using the service IP uses satask and sainfo commands.)

In this example, you want to provide a host system with two disks and create a FlashCopy® of these two disks. The copy is to be made available to a second host. These two hosts require that the host objects that are created, correspond with the group of worldwide port names (WWPNs) presented by their Fibre Channel host bus adapters (HBAs) to the SAN. You also need to create four virtual disks, also known as volumes, one for each of the disks that are to be presented to the hosts. Once the volumes are created, you can map two of them to each host. In order to create the volumes you need to have storage pools. You want to spread the 8 MDisks across two storage pool and create the source volumes from one and the target volumes from the other. In order to create any of these objects you need to create a system and at least add one more node to the system.

The following steps illustrates how this can be done:
  1. Create a system.
  2. Configure the system with an IP address of 9.20.123.456, a fabric speed of 2 GB. Name the system examplecluster.
  3. Add nodes:
    • Add knode and lnode to the input/output (I/O) group called io_grp0 in the examplecluster system.
    • Add mnode and nnode to the I/O group called io_grp1 in the examplecluster system.
  4. Create the storage pools maindiskgroup and bkpdiskgroup.
  5. Create four volumes:
    • Create two volumes from maindiskgroup.
    • Create two volumes from bkpdiskgroup.
  6. Create two host objects:
    • Create a host object called demohost1 with HBAs that have WWPNs of 10000000C92AD7E5 and 10000000C92F5123.
    • Create a host object called demohost2 with HBAs that have WWPNs of 210000E08B0525D4 and 210100E08B2525D4.
  7. Create the volume-to-host mappings:
    • Map the two volumes from maindiskgroup to demohost1.
    • Map the two volumes from bkpdiskgroup to demohost2.
  8. Create FlashCopy mappings:
    • Create a FlashCopy mapping called main1copy that has a background copy rate of 75.
    • Create a FlashCopy mapping called main2copy that has a background copy rate of 50.
  9. Create a FlashCopy consistency group called maintobkpfcopy and add the two FlashCopy mappings to it.
  10. Prepare and trigger (or start) the FlashCopy consistency group that contains these mappings.
    Note: Once this step is complete, you have created and allocated storage to your host systems. You have made two volumes available to demohost1 and then used FlashCopy to make backup copies on two volumes that are accessible to demohost2.