Logical Unit Management; Indexed Maps - HP M2402 User Manual

Configuration Overview

Logical Unit Management

Because SAN resources can be shared, it is possible for multiple hosts to have
access to the same devices on the SAN. To prevent conflicts, the router provides
LUN management as a means to restrict device access to certain hosts. LUN
management goes beyond simple LUN masking, to prevent gaps in the list of
LUNs presented to a host.
LUN management maps can be created for different views of the devices attached
to the router. Each Fibre Channel host is assigned a specific map configuration.
Not only can the administrator control which devices a host may access, but also
which LUNs are used to access these devices.
For a Fibre Channel host, a map is a table of LUNs, where each entry is either
empty or contains device address information needed for host/device
communication.
For a SCSI host, a map contains a list of target IDs, each of which has its own
table of LUNs with address information needed for host/device communication.
Note:
Both Fibre Channel ports and SCSI buses have user-defined maps and pre-defined
maps.
There are three predefined maps:
When a host sends a command, the router will select which map to use, based on
the port receiving the command and the ID of the host sending the command. For
Fibre Channel ports, the host ID is the World Wide Name and for SCSI buses, the
host ID is the Initiator ID (0 - 15). When a host is unknown or is not assigned a
specific map, the router will use the default map.

Indexed Maps

An Indexed map is initially empty and can be modified by the user.
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The router can respond to multiple Target IDs on a SCSI bus.
Indexed (default)
Auto Assigned
SCC
Network Storage Router M2402 User Guide