HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 129

Dual Port Virtual Devices, Library Parameters, Map LUNs window

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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 24). Figure 24 Library 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 entered 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 ID number assigned by the VLS is recognized as that LUN number by the host's operating system. The other virtual device is ignored by the operating 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 port. Both ports must be on the same node. The Port Mapping list 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 path 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. When creating dual port virtual devices, the LUN numbering on both ports follows the conventions for default LUN numbering (see "Default LUN Numbering" on page 120); however, if you use LUN HP StorageWorks 12000 Gateway Virtual Library System User Guide 129

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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 24
).
Figure 24 Library 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 entered 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 ID number assigned by the VLS is recognized as that LUN number by the
host's operating system. The other virtual device is ignored by the operating 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 port. Both ports must be on the same node. The
Port Mapping
list
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 path 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.
When creating dual port virtual devices, the LUN numbering on both ports follows the conventions
for default LUN numbering (see
“
Default LUN Numbering
”
on page 120); however, if you use LUN
HP StorageWorks 12000 Gateway Virtual Library System User Guide
129