1. Perform LUN masking and select Mapping Ena bled for the hosts for which you want to perform
LUN mapping.
2. Click the System tab.
3. Select a virtual library or tape drive in the navigation tree that you want to make visible (accessible)
to the host.
4. Click Map LUNs in the task bar.
The Map LUNs window opens and displays the hosts with mapping enabled selected on the Host
LUN Mapping Mode window (Figure 36).
Figure 36 L
ibrary Parameters – Map LUNs window
5. To allow a listed host to access the virtual library, enter a LUN value in the LUN box (such as 0, 1,
2, and so on).
The LUN value entere d is assigned to the virtual library for that specific host. The default value 255
means the host does not have access.
6. When you are finished making changes, click Apply Settings.
7. Repeat these steps for the rest of the virtual libraries and tape drives configured on the VLS that
you want to make visible to the host.
CAUTION:
Each virtual device must be assigned a unique LUN number on the FC host port to which it is mapped. If
two virtual devices have the same LUN number on the same FC host port, the virtual device with the
lowest virtual device I D number assigned by the V LS is recognized as that LUN number by the host’s
operating system. The other virtual device is ignor ed by the opera ting system.
Dual port virtual devices
When creating a library robot LUN or tape drive LUNs, you can present the virtual devices to a pair of
host ports rather than just one por t. B oth ports must be on the same node. The Port Mapping drop-down
box displays selections for each individual port plus possible port pairs (for example: 0, 1, 0&1). The
benefit of dual port virtual devices is that they are still accessible when one p ath fails.
CAUTION:
Many operating systems and backup applications do not support more than one path to a tape library
device. Only use this feature if you are certain that it is supported.
HP StorageWorks
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