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Dell Solutions Enabler 10.0.0 TimeFinder/Clone CLI User Guide

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Using composite groups to manage clone pairs across arrays

About this task

Figure 1 shows a production host locally connected to two arrays (A and B). A composite group is defined on the production host and includes source devices and target devices from each array. The target devices can be standard devices or BCV devices. Another locally connected host allows access to the clone targets.

Figure 1. Using a composite group when a set of devices spans two arrays

Although clone copy operations might normally be performed from the production host (Figure 1) because the composite group is defined there in its SYMAPI database, there are methods that would allow you to control clone operations from another locally connected host like the target host. One way is to copy the composite group definition to another host. A more efficient method is to enable Group Naming Services (GNS), which automatically propagates the composite group definition to the arrays and other locally attached hosts that are running the GNS daemon.

The following steps explain how to setup a composite group that spans two arrays as shown in Figure 1:

Steps

  1. From the production host, create a Regular type composite group (for example, MyGrp):
    symcg create MyGrp -type regular
  2. Add to the composite group those standard devices on array A (3087) and array B (3143) that are the source devices:
    symcg -cg MyGrp -sid 3087 add dev 0072
    symcg -cg MyGrp -sid 3143 add dev 0095
  3. Associate a BCV target device from each array with the composite group:
    symbcv -cg MyGrp -sid 3087 associate dev 0053
  4. Create clone pair sessions from those devices in the composite group:
    symclone -cg MyGrp create
  5. Activate these clone pair sessions:
    symclone -cg MyGrp activate

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