HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 122

LUN Masking (v2.x), LUN Mapping

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In the VLS, LUN masking occurs automatically for all hosts when you enable LUN mapping using the global enable/disable LUN mapping setting. See "Setting the Default LUN Mapping" on page 123. LUN Masking (v2.x) By default all hosts on the SAN can access all the virtual libraries on the VLS. You can restrict a host's access to the virtual libraries and/or tape drives (virtual devices) on the VLS by performing LUN masking. LUN masking should also be used when there are more virtual devices (LUNs) port mapped to a FC host port than the operating system LUN restrictions support. This prevents the host's operating system from seeing the virtual devices it needs to see on the port. For example, if a host's operating system is configured to only see up to eight LUNs per FC host port, the host will not be able to see the virtual 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, from Command View VLS: 1. Click the System tab. 2. Select Chassis in the navigation tree. 3. 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 20). Figure 20 Host LUN Mapping Mode window . 4. 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 (v2.x)" on page 128. 5. To assign a host name alias to a host WWPN listed, enter the host name in the Hostname box. 6. 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. 7. When you are finished making changes, click Apply Settings. LUN Mapping The method of LUN mapping differs between VLS firmware versions 3.x and 2.x. 122 Configuration

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In the VLS, LUN masking occurs automatically for all hosts when you enable LUN mapping using the
global enable/disable LUN mapping setting. See
“
Setting the Default LUN Mapping
”
on page 123.
LUN Masking (v2.x)
By default all hosts on the SAN can access all the virtual libraries on the VLS. You can restrict a host's
access to the virtual libraries and/or tape drives (virtual devices) on the VLS by performing LUN
masking.
LUN masking should also be used when there are more virtual devices (LUNs) port mapped to a FC
host port than the operating system LUN restrictions support. This prevents the host's operating system
from seeing the virtual devices it needs to see on the port. For example, if a host's operating system
is configured to only see up to eight LUNs per FC host port, the host will not be able to see the virtual
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, from Command View VLS:
1.
Click the
System
tab.
2.
Select
Chassis
in the navigation tree.
3.
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 20
).
Figure 20 Host LUN Mapping Mode window
.
4.
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 (v2.x)
”
on page 128.
5.
To assign a host name alias to a host WWPN listed, enter the host name in the
Hostname
box.
6.
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
.
7.
When you are finished making changes, click
Apply Settings
.
LUN Mapping
The method of LUN mapping differs between VLS firmware versions 3.x and 2.x.
Configuration
122