• Introduction



    About this document

    This document provides information that you can use to configure and manage VNX imports (migrations) on the Unity system. Along with relevant concepts and instructions to configure VNX imports using the Unisphere GUI, this document also includes information about the CLI commands that are associated with configuring VNX imports.

    For more information about other Unisphere features or CLI commands, refer to the Unisphere online help and Unisphere Command Line Interface User Guide.

    Additional resources

    As part of an improvement effort, revisions of the software and hardware are periodically released. Therefore, some functions described in this document might not be supported by all versions of the software or hardware currently in use. The product release notes provide the most up-to-date information on product features. Contact your technical support professional if a product does not function properly or does not function as described in this document.
    Where to get help

    Support, product, and licensing information can be obtained as follows:

    For product and feature documentation or release notes, go to Unity Technical Documentation at: www.emc.com/en-us/documentation/unity-family.htm.

    For information about products, software updates, licensing, and service, go to Online Support (registration required) at: https://Support.EMC.com. After logging in, locate the appropriate Support by Product page.

    For technical support and service requests, go to Online Support at: https://Support.EMC.com. After logging in, locate Create a service request. To open a service request, you must have a valid support agreement. Contact your Sales Representative for details about obtaining a valid support agreement or to answer any questions about your account.

    Special notice conventions used in this document
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    Addresses practices not related to personal injury.
    Presents information that is important, but not hazard-related.

    About import

    The Import feature allows you to migrate a VDM, or a LUN or a consistency group (CG) of LUNs, with its configuration and data from an existing source VNX storage system to a target Unity storage system. This feature provides a built-in capability for NFS-only VDM imports with minimal or no disruption to clients. It also provides a built-in capability for CIFS-only VDM and block-based imports. However, cutting over of a CIFS-only VDM or a block import session can be a disruptive process.

    For a block-based import, after the cutover completes, host I/O operations are switched to the target system and the import process completes automatically. For a file-based virtual data mover (VDM) import, after cutover completes, the import process does an incremental copy automatically but you must complete the import manually.

    An import is always conducted from the Unity storage system. The target system makes a remote call to the VNX storage system and instigates a pull (for file-based import) or push (for block-based import) of the source storage resources to the target system.