Modifying NDMP device access configuration

Backup Administration Guide for Hitachi NAS Platform

Part Number
NDMP backup devices, such as tape libraries and auto-changers, require special configuration. The server monitors its Fibre Channel (FC) links periodically and automatically detects the presence of backup devices. Because the server may be connected into a Storage Area Network (SAN) shared with other servers, it does not automatically make use of backup devices it detects on its FC links.
  1. Navigate to Home > Data Protection > NDMP Device List to display the NDMP Device List page.
  2. Click on the details icon for the device for which you wish to modify access.

  3. The following table describes the fields in this page.
    Item/Field Description
    ID Displays the server-assigned device identifier.
    Allow Indicates if device access is allowed (Allow) or denied (Deny).
    Note: An NDMP device must be assigned to an EVS before access can be allowed to the device.

    If access is not allowed to a device, click allow access to enable access.

    To deny access to a device, click deny access. A request to deny access will be rejected if an NDMP client has opened the device. The backup application configuration should be changed to avoid use of the device before denying access.

    EVS Indicates the specific EVS to which the device is assigned, or indicates that the device is assigned to all EVSs.

    To change the device assignment, select the EVS to which you want to assign the device, or select All EVS to assign the device to all EVSs hosted by the server/cluster, and click reassign.

    Tape devices can be shared among EVSs under the following conditions:
    • The EVSs must be within the same cluster.
    • The tape device is not shared with another Hitachi server.
    • The tape device is not shared with another storage device.
    • If the device is to be shared between this server and another non-clustered server, additional sharing logic is required. Some backup applications automatically allow such sharing without any extra configuration. For other backup applications it is necessary to use the SCSI Reserve/Release protocol, which can be enabled using the ndmp-option reserve_devices CLI command.
    • When one EVS is currently using a tape device, any attempt to use it through a different EVS will prompt a notification that the device is currently in use (that is, the operation will not be queued).
    • When a tape device is currently assigned to a specific EVS (but not to All EVS), any attempt to access it through a different EVS will prompt notification that the device has not been found.
    Hardware Details This section displays hardware-related details about the device, including:
    • Device Type, which can be either tape drive or autochanger.
    • Manufacturer (Model), which are the device manufacturer and model detected when the device is discovered.
    • Version, which indicates the version of the firmware currently on the device, if it was detected when the device was discovered.
    Device Identification This section displays identification information about the device, including:
    • NDMP Device Name, which displays the name by which the device can be addressed by the server.

      To configure your storage management application to work with an NDMP device, in the storage management application you must specify the device name of each autochanger/tape drive you want the application to use.

    • Location, which displays the name of the autochanger that holds the drive and the position of the drive in the autochanger. For example, the location of the first drive in autochanger /dev/mc_d0l0 is /dev/mc_d0l0 : 1.
    • Serial Number, which indicates the device’s serial number, if it was detected when the device was discovered.
    • Fibre Channel Address, which indicates the device’s Fibre Channel node name.
    • LUN, which indicates the LUN identifier for the device.

      When the NAS Manager cannot determine the location of a tape drive, it displays *unknown*. When this occurs, check for the following conditions and follow the troubleshooting instructions:

    • The tape library is offline.
    • The autochanger does not support the server’s mechanism for querying the tape drive location, or the autochanger has not been set up to accept this query. Where this is the case, compare the serial numbers of the tape drives with displays available in the tape library to verify the drive locations.
    • The autochanger and a tape drive within it are attached to different servers. In this case, use the tape drive serial numbers to match the device name shown by one server with the location shown on the other.
      Note: Devices will not be available or visible if access to them has not been enabled.
  4. The following Actions are available:
    • Click deny access to disable access to a device, which prevents NDMP from attempting to use the device
      Note: While an NDMP server has the device open, a deny access request will be rejected. Therefore, the storage management application configuration should be changed to avoid use of the device before the current configuration process.
    • Click allow access to enable access to a device, which allows NDMP to use the device.
      Note: Before using an NDMP device, you must first allow access to it, then it must be assigned to an EVS. NDMP Devices are assigned to an EVS using the NDMP Device Access Details page described in
    • Click forget to remove the selected device from the list (only available for devices that have been disconnected from the FC).
    • Click Refresh Status on the Device List page to discover any changes in the Fibre Channel connection; that is, to find any newly attached devices and discover whether any previously discovered devices that are no longer accessible. If new devices are plugged into the Fibre Channel, use Refresh to identify them.