Learn About Missing Logical Drives

Related Topics

A missing logical drive is a placeholder node displayed in the Logical View, indicating that the storage subsystem has detected drives associated with a logical drive that are no longer accessible. Typically, this is the result of removing drives associated with an array, or when a loss of power to one or more drive enclosures has occurred.

Missing logical drives will only be displayed in the Logical View if associations exist, such as a logical drive-to-LUN mapping or associated FlashCopy and repository logical drives.

Caution: Missing logical drives, in most cases, are recoverable. Do not delete missing logical drives without confirming that the logical drives are no longer required, as they will be permanently removed from the configuration. For more information, see Recovering Missing Logical Drives.

If missing logical drives are detected by the storage subsystem, a Missing Logical Drives group is created in the Logical View of the Subsystem Management Window. Each missing logical drive is shown, identified by its world wide name and logical drive type. Missing logical drives are identified as being either a standard logical drive , base logical drive , FlashCopy logical drive , or repository logical drive .

The Defined Mappings pane of the Mappings View updates a logical drive's properties when it is detected as being a missing logical drive.

Missing Logical Drive Examples

The following are examples of typical display changes that occur in the Subsystem Management Window when missing logical drives are detected by the storage subsystem.

Example 1:

A standard logical drive has no associated higher-level logical drives and no logical drive-to-LUN mapping defined.

Display Details:

  • The logical drive is removed from the Logical View.
  • A missing logical drive is not displayed in the Logical View.
  • There is no change to the Defined Mappings pane of the Mappings View.

Menu Options Available:

None

Example 2:

A standard logical drive has no higher-level logical drives but has a logical drive-to-LUN mapping defined.

The standard logical drive is displayed as missing.

Display Details:

  • In the Logical View, the Missing Logical Drives group is created with the missing standard logical drive displayed under it.

  • Defined Mappings pane in the Mappings View is updated:
    • Standard Logical Drive Name replaced with world wide name.
    • Standard Logical Drive Capacity replaced with "Unknown."
    • Standard Logical Drive Type changed to "Missing."

    Menu Options Available:

    Delete (pull-down and right-mouse pop-up menu)

  • Example 3:

    A base logical drive with an associated higher-level logical drive (FlashCopy), has defined logical drive-to-LUN mappings. The repository logical drive exists on the same array.

    The base logical drive and repository logical drive are displayed as missing.

    Display Details:

    • In the Logical View, the Missing Logical Drives group is created, with the missing base and repository logical drives displayed under it.
      • Associated FlashCopy logical drive is displayed as a child node of the base logical drive.

    • Defined Mappings pane in the Mappings View is updated:
      • Base Logical Drive Name replaced with world wide name.
      • Base Logical Drive Capacity replaced with "Unknown."
      • Base Logical Drive Type changed to "Missing."
      • FlashCopy Logical Drive Type changed to "Unavailable."

    Menu Options Available:

    • Delete (pull-down and right-mouse pop-up menu)
    • View Associated Components (right-mouse pop-up menu only)
    • Go To Repository/FlashCopy Logical Drive (right-mouse pop-up menu only)
    • Properties (pull-down and right-mouse pop-up menu)

    Example 4:

    A base logical drive with an associated higher-level logical drive (FlashCopy) has defined logical drive-to-LUN mappings. The repository logical drive exists on a different array.

    Only the base logical drive is displayed as missing.

    Display Details:

    • In the Logical View, the Missing Logical Drives group is created, with the missing base logical drive displayed under it.
      • Associated FlashCopy logical drive is displayed as a child node of the base logical drive.

    • Defined Mappings pane in the Mappings View is updated:
      • Base Logical Drive Name replaced with world wide name.
      • Base Logical Drive Capacity replaced with "Unknown."
      • Base Logical Drive Type changed to "Missing."
      • FlashCopy Logical Drive Type changed to "Unavailable."

    Menu Options Available:

    • Delete (from pull-down and right-mouse pop-up menu)
    • View Associated Components (right-mouse pop-up menu only)

    Example 5:

    A base logical drive with an associated higher-level logical drive (FlashCopy) has defined logical drive-to-LUN mappings. The repository logical drive exists on a different array.

    Only the repository logical drive is displayed as missing.

    Display Details:

    • In the Logical View, the Missing Logical Drives group is created with the missing repository logical drive displayed under it.

    • There is no change to the Defined Mappings pane of the Mappings View.

    Menu Options Available:

    • View Associated Components (right-mouse pop-up menu only)
    • Go To FlashCopy Logical Drive (right-mouse pop-up menu only)

    Recovering Missing Logical Drives

    If missing logical drives are detected because drives have accidentally been removed, or are detected as missing due to a loss of power to the drive enclosures, recovery of these logical drives is possible by:

    For detailed recovery instructions, see the Recovery Guru Procedures, or contact technical support.

    If the missing logical drives are no longer required, they can be deleted permanently from the configuration. For more information, see Deleting a Missing Logical Drive.

    Related Topics

    Deleting a Missing Logical Drive

    Recovery Guru Procedures