devices numbered LUN8, LUN9, ..., and up. LUN masking limits the virtual devices (LU N s) 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 a nd 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 E nabled 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 per forming LUN mapping.
6. ToassignahostnamealiastoahostWWPNlisted,enterthehostnameintheHostname box.
7. To add a host WWPN to the list that is not plugge d into the SAN yet, enter the host WW PN
number and then click Add.
8. When you are finished making changes, click Apply Setting s.
LUN ma
pping
By def
ault all hosts on the SAN see the LU N numbers that have been assigned to the virtual devices by
the VL
S soft ware. You have the option of assigning a different LUN number to a virtual device by host
usin
g the LUN mapping feature. For example, you can assign Librar y 2 the LUN number LUN0 for host1,
and t
he 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 m ay not include LU N 0 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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