Why does a local storage system display an incorrect LUN capacity after an external LUN of a heterogeneous storage system is mapped to the local stora

Possible reasons are as follows:

• Some heterogeneous storage systems are specially processed in displaying capacities, which leads to inconsistent displays of capacities in the units of KB, MB, GB and TB on the local storage system and the heterogeneous storage system. However, when the capacity is displayed in the unit of sector, it is the same on both the local storage system and the heterogeneous storage system (for example, the IBM XIV series storage systems).

• Due to their special processing mechanisms, some heterogeneous storage systems report a smaller capacity to a local storage system after mapping an external LUN to the local storage system. Therefore, the local storage system displays an incorrect capacity information about the mapped external LUN.

Some value-added features on a local storage system require that the used local LUN and external LUN have the same capacity. Therefore, the local LUN must have the same capacity as the external LUN. Create a local LUN following the procedure below:

1. View the capacity of eDevLUN.

   1. Log in to the DeviceManager for local storage system 1.

   2. In the navigation bar, choose Services > Block Service > LUNs. View the number of sectors on the eDevLUN.

      
      

2. On local storage system 2, create a local LUN.

   1. Log in to the DeviceManager for local storage system 2.

   2. In the navigation bar, choose Services > Block Service > LUNs.

   3. Click Create.

      The Create LUN dialog box is displayed.

   4. In the Capacity text box, enter the number of blocks that you viewed in 1. Set the unit to Blocks.

   5. Click OK.

3. Check whether the created local LUN has the same capacity as the external LUN.

• If yes, you have created a correct local LUN.

• If no, perform Step 1 and Step 2 to re-create a local LUN.

1. Log in to the DeviceManager for local storage system 2.

2. In the navigation bar, choose Services > Block Service > LUNs.

3. Check whether the created local LUN has the same capacity as the external LUN.