Updating and activating an SCDS

The Move Volume utility processes only objects that are associated with Object and Object Backup storage groups that are defined and enabled in the active SCDS. In your preparation for invocation of the Move Volume utility, update the SCDS, if necessary:

  1. If the source volume is a backup volume from the Object Backup storage group, the SCDS must include all Object storage groups that contain objects that have a backup copy on the backup source volume. The Move Volume utility uses the list of Object storage groups defined in the SCDS to identify the objects to be moved.

    Failure to include all Object storage groups containing objects that have a backup copy on the backup source volume causes non-valid results. For example, although not all of the objects have been moved from the source volume, the utility might issue messages indicating that all objects are moved from the source volume because all of the objects identified in the SCDS have been moved. This situation occurs because the SCDS excludes some of the Object storage groups that contain objects having a backup copy on the backup source volume.

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  2. You might need to update the storage group that contains the source volume to define the set of drives eligible to write data into the storage group. Make sure that the storage group containing the source volume includes libraries capable of writing to the target optical media type. Use one of the following methods to update the storage group:
    1. Remove libraries from the storage group definition that contains volumes that you do not want to be used as target volumes for MOVEVOL.
    2. Add libraries that contain volumes that you do want to be used as target volumes for MOVEVOL.
    3. Leave the libraries with the undesired media assigned to the storage group, but for the duration of MOVEVOL, mark them as unwritable or full.
    4. If you use multifunction device types in the storage group definition, update the media type attribute in the library definition to direct writes to a specific media type.
    5. If you use multifunction device types in the storage group definition, update the library’s read-only and write capable function based on the source and target media types.

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  3. Activate the updated SCDS.

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For more information on updating and activating the SCDS, see z/OS DFSMSdfp Storage Administration.

The examples in Table 1 show how to migrate data from an older media type to a newer media type using various methods.

Table 1. How to migrate from old media types to new media types
Method Scenario Desired Result Tasks
Removing libraries from storage group definitions. You have libraries with drives capable of writing to old media types defined to a storage group. Ensure that the target volumes for the MOVEVOL request are new media types.
  • Remove any libraries with drives capable of writing to old media types from the storage group definition.
  • Add libraries with drives capable of writing to new media types to the storage group definition, if some libraries are currently not defined.
Migrating without modifying the SCDS. VOL1 is an old media type and belongs to SG1. Libraries containing drives capable of writing to both old media types and new media types exist in the SCDS. Ensure that the target volumes for the MOVEVOL request for VOL1 are new media types.
  • Mark full or unwritable any scratch volume in libraries associated with SG1 that are capable of writing to old media types.
  • Mark full or unwritable any volume belonging to SG1 in libraries that are capable of writing to old media types.
Using the library default media type All libraries associated with the source volume’s storage group are multifunction 3995 optical libraries that are capable of writing to both old media types and new media types. Ensure that the target volumes for the MOVEVOL request are new media types. Modify the library default media type to a media type that includes new media types, but not old media types, for each library associated with the source volume’s storage group. This allows read requests for old media types to still occur inside the libraries, while any new requests to that storage group will be satisfied with new media types.
Using multifunction libraries without modifying the SCDS You are using multifunction 3995 optical libraries that use old media types as read-only. Ensure that the target volumes for the MOVEVOL request are new media types. Make certain that no libraries associated with the source volume’s storage group can write to old media types. The reads from the source volume are still supported and all writes are directed to new media types without making any modification to the SCDS.

For more information regarding updating, validating, and activating an SCDS, see z/OS DFSMSdfp Storage Administration.

Parent topic: Preparation of the Move Volume utility environment