Installation guide

Configuration
Manual No. 771961 4-61
Host to LUN Mapping Overview
For External RAID Controller Firmware 6.x and above, the Host to LUN
Mapping feature restricts host access to configured logical drives. Access to
a configured logical drive is granted only to a single host or group of hosts,
providing limited security control of data in a Storage Area Network (SAN)
environment where multiple hosts are connected to the controller.
The Host to LUN mapping feature is intended for use in configurations in
which multiple host computers attach to one or more Mylex controllers. This
is also referred to as a Storage Area Network (SAN) configuration. The host
computers are attached to the controller(s) through a fibre channel arbitrated
loop or through a switch making the logical drive accessible to all host
computers. By utilizing host to LUN mapping, each logical drive can be
configured to be visible to a single host computer only. The controller uses
the World Wide Name (WWN) to uniquely identify host computers that have
logged into the controller. A list of valid hosts and their corresponding
WWNs is provided to GAM in order to configure the host to LUN mapping.
Once logical drives are configured, the controller maintains a table of
WWNs for each logical drive. This table defines the hosts that are granted
access to each logical drive and the controller port and the LUN number.
Host to LUN Mapping in Global Array Manager
(FW 6.x or above)
For External RAID Controllers using Firmware 6.x or above, Global Array
Manager implements Host to LUN Mapping by allowing the user to select
the topology used by the controller(s), the port to be used, the Host to
Logical Drive Mapping for each logical drive, and the Logical Drive to LUN
Mapping for each logical drive. Figure 4-51 shows an example of Host to
LUN mapping.