• Migrating FC or iSCSI Data to the Storage System

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    Migrating FC or iSCSI Data to the Storage System

    FC or iSCSI data migration environment and limitations

    The following table outlines the environment for a manual copy migration and an application tool migration of FC or iSCSI data.

    Table 1. Migration environment
    Component
    Requirement
    Unity storage
    LUN sized to accommodate the data in the LUN that you want to migrate and to allow for data growth
    Host
    Single host with access to the LUN with data to be migrated and also to the LUN for the migrated data
    LUN
    Single LUN on either a local or attached FC or iSCSI storage device that you migrate in its entirety to the storage system share

    The downtime for a manual copy migration is relative to the time required for copying the data from the LUN to the storage system LUN. The downtime for an application-specific tool migration should be less than the downtime for a manual copy.

    Migrating iSCSI disk data

    To migrate iSCSI data to a storage system LUN, perform these tasks:

    1. Attach the host or virtual machine to the new storage system LUN
    2. Migrate the data

    Attach the host or virtual machine to the new storage system LUN

    Procedure
    1. Configure each host or virtual machine initiator that needs access to the LUN to connect to the iSCSI interface (target) with the new LUN, as described in Windows host — Configuring to connect to an iSCSI interface for a Windows host or virtual machine or Linux host — Setting up for iSCSI storage for a Linux host.
    2. Prepare the new LUN to receive data, as described in Windows host — Setting up to use iSCSI LUNs for a Windows host or Linux host — Setting up for iSCSI storage for a Linux host.

    Migrate the data

    Procedure
    1. If any host or virtual machine applications are actively using the device (LUN) with the data being migrated, stop the applications gracefully.
    2. Migrate the data with the method best suited for copying data from the device to the new storage system LUN.
      On a Windows host, this method can be a simple cut and paste or drag and drop operation.
    3. When the copy operation is complete:
      On a Windows host:
      1. Assign a temporary drive letter to the LUN.
      2. Assign the old drive letter to the LUN to which you copied the data.

      On a Linux host:

      1. Unmount the original file system on the device.
      2. Adjust the host’s mount tables, which are typically in /etc/fstab, to reflect the new location of the data.
      3. Mount the new LUN using the mount -a or a similar command.
    4. Restart the applications on the host.