HP StorageWorks 300 HP StorageWorks 300 Virtual Library System user guide (AH1 - Page 70

LUN mapping, Host LUN Mapping Mode window

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devices numbered LUN8, LUN9, ..., and up. LUN masking limits the virtual devices (LUNs) the host's operating system can see on the port, so that only the virtual devices the host needs to see are visible. To perform LUN masking: 1. Open a Command View VLS session and log in as the administrator. See Opening a Command View VLS session from Command View TL. 2. Click the System tab. 3. Select Chassis in the navigation tree. 4. Click Host LUN Mapping Mode in the task bar. The Host LUN Mapping Mode window opens and displays a list of the host world wide port numbers (WWPNs) seen by the VLS FC host ports on the SAN (Figure 35). Figure 35 Host LUN Mapping Mode window 5. Select Mapping Enabled in the Mapping Status box for each host for which you want to perform LUN masking. The hosts with mapping enabled are not able to access any of the virtual devices on the VLS until you give them access by performing LUN mapping. 6. To assign a host name alias to a host WWPN listed, enter the host name in the Hostname box. 7. To add a host WWPN to the list that is not plugged into the SAN yet, enter the host WWPN number and then click Add. 8. When you are finished making changes, click Apply Settings. LUN mapping By default all hosts on the SAN see the LUN numbers that have been assigned to the virtual devices by the VLS software. You have the option of assigning a different LUN number to a virtual device by host using the LUN mapping feature. For example, you can assign Library 2 the LUN number LUN0 for host1, and the other hosts will still see Library 2 as the LUN number assigned by the VLS software. LUN mapping is by host and is used to allow host access to hosts that are LUN masked, and to present only a subset of the VLS virtual devices to a host. LUN mapping should only be used if the host requires LUN masking. For example, if host1 is LUN masked so it cannot see all the virtual libraries and/or virtual tape drive on a FC host port, the LUN numbers it can see may not include LUN0 and have no gaps in the LUN numbering as required by the operating system. See Operating system LUN requirements and restrictions. To perform LUN mapping: 70 Configuration

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devices numbered LUN8, LUN9, ..., and up. LUN masking limits the virtual devices (LUNs) the host’s
operating system can see on the port, so that only the virtual devices the host needs to see are visible.
To perform LUN masking:
1.
Open a Command View VLS session and log in as the administrator. See
Opening a Command
View VLS session from Command View TL
.
2.
Click the
System
tab.
3.
Select
Chassis
in the navigation tree.
4.
Click
Host LUN Mapping Mode
in the task bar.
The Host LUN Mapping Mode window opens and displays a list of the host world wide port numbers
(WWPNs) seen by the VLS FC host ports on the SAN (
Figure 35
).
Figure 35 Host LUN Mapping Mode window
5.
Select
Mapping Enabled
in the
Mapping Status
box for each host for which you want to perform
LUN masking.
The hosts with mapping enabled are not able to access any of the virtual devices on the VLS until you
give them access by performing
LUN mapping
.
6.
To assign a host name alias to a host WWPN listed, enter the host name in the
Hostname
box.
7.
To add a host WWPN to the list that is not plugged into the SAN yet, enter the host WWPN
number and then click
Add
.
8.
When you are
fi
nished making changes, click
Apply Settings
.
LUN mapping
By default all hosts on the SAN see the LUN numbers that have been assigned to the virtual devices by
the VLS software. You have the option of assigning a different LUN number to a virtual device by host
using the LUN mapping feature. For example, you can assign Library 2 the LUN number LUN0 for host1,
and the other hosts will still see Library 2 as the LUN number assigned by the VLS software.
LUN mapping is by host and is used to allow host access to hosts that are LUN masked, and to present
only a subset of the VLS virtual devices to a host.
LUN mapping should only be used if the host requires LUN masking. For example, if host1 is LUN masked
so it cannot see all the virtual libraries and/or virtual tape drive on a FC host port, the LUN numbers it
can see may not include LUN0 and have no gaps in the LUN numbering as required by the operating
system. See
Operating system LUN requirements and restrictions
.
To perform LUN mapping:
70
Con
fi
guration