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Connecting to a LUN

You can connect your SnapDrive for Windows host to a LUN by using the Connect Disk wizard in the SnapDrive??MMC snap-in.

Before you begin

You must have manually created initiator groups by using OnCommand System Manager or the storage system console.

About this task

SnapDrive filters volumes, qtrees, and LUNs depending on storage system access control settings that might exist in the AccessControl.xml file on your storage system. During LUN connection, SnapDrive displays the message "Checking access control" to indicate that it is checking these access control settings.


  1. Under SnapDrive in the left MMC pane, expand the instance of SnapDrive you want to manage. Then, select Disks.
  2. From the menu choices at the top of MMC, navigate to Action > Connect Disk.
  3. In the Connect Disk wizard, click Next.
  4. In the Provide a Storage System Name, LUN Path and Name panel, perform the following actions:
    1. In the ???Storage System Name??? field, type the name of the storage system where the LUN will be connected, or choose a storage system from the drop-down list.
    2. In the LUN Path field, type the path to the LUN, or click Browse and navigate to the LUN you want to connect.
    3. Click Next.
  5. If the LUN is a dedicated disk, go to the next step; otherwise, if the LUN is a Windows cluster resource, perform the following steps in the Specify Microsoft Cluster Services Group panel:
  6. In the Specify Microsoft Cluster Services Group panel, perform one of the following actions and then click Next:

    • Select a cluster group from the Group Name drop-down list.
    • Select Create a new cluster group to create a new cluster group.
      Note: When selecting a cluster group for your LUNs, choose the cluster group your application will use. If you are connecting to a volume mount point, the cluster group is already selected, because the cluster group owns your root volume physical disk cluster resources. You should create new shared LUNs outside of the cluster group.
    • Select Add to cluster shared volumes.

  7. In the Select LUN Properties panel, perform the following actions:
    1. Either select a drive from the list of available drive letters, or enter a mount point for the LUN you are connecting.

      When you connect a volume mount point, enter the drive path that the mounted drive will use: for example, G:\mount_drive1\.

      Note: The root volume of a new mount point must be owned by the node on which you are creating the new disk.
      Note: You can connect cascading volume mount points (by mounting one mount point on another mount point); however, in the case of a cascading mount point connected on a MSCS shared disk, you might receive a system event warning indicating that disk dependencies might not be correctly set. This is not the case, however, and the mounted disks function as expected.

    2. Click Next.
  8. In the Select Initiators panel, choose an initiator for the LUN.

    Note: If MPIO is installed on the system, you can select multiple FC initiator ports or one iSCSI session.

    If the LUN will... Then do this...
    Belong to a single system Select at least one initiator for the LUN you are creating from the list of available initiators, and then click Next.
    Be a Windows cluster resource
    1. Double-click the cluster name to display the hosts that belong to the cluster.
    2. Click the name of a host to select it.
    3. Select at least one initiator for the LUN you are creating from the list of available initiators on that host.
    4. Repeat steps b and c for all hosts in the cluster.
    5. Click Next.
    Note: Next remains unavailable until initiators for all hosts of a cluster are selected.
  9. In the Select Initiator Group Management panel, specify whether to use automatic or manual igroup management.

    If you select automatic igroup management, SnapDrive uses existing igroups or, when necessary, creates new igroups for the initiators you have specified. If you select manual igroup management, you manually choose existing igroups or create new ones as needed.

    If you specify... Then...
    Automatic igroup management Select Automatic, and then click Next.
    Manual igroup management Select Manual, click Next, and then, in the Select Initiator Groups panel, perform one of the following actions:
    • Select from the list the igroups to which you want the LUN to belong. Repeat this action for each node in the cluster, then click Next.
      Note: A LUN can be mapped to an initiator only once.
    • Click Manage igroups, and for each new igroup you want to create, type a name in the Igroup Name text box, select initiators, and click Create. Then, click Finish to return to the Select Initiator Groups panel, and click Next.
    Note: The Next button in the Select Initiator Groups panel remains unavailable until the collection of selected igroups contains all the initiators you previously selected for use.
  10. In the Completing the Connect Disk Wizard panel, perform the following actions:
    1. Verify all the settings.
    2. If you need to change any settings, click Back to go back to the previous wizard panels.
    3. Click Finish.

    The newly connected LUN appears under SnapDrive > Disks in the left MMC panel.