Specifications

14
3.1.1 Mapping devices
Access to SCSI devices is via Fibre Port and Fibre LUN addresses mapped to SCSI bus, target and LUN.
CLI commands are used to modify the mapping.
The Command Line Interface commands
AutoMap , AddressMap and RouteXxxxx map
Fibre Channel ports and LUNs to SCSI
bus/target/LUNs. Host applications use the Fibre
port and Fibre LUN to access specific SCSI
devices.
For information on how to access the CLI via a
text interface or ATTO BridgeTools, a graphical
interface, see Chapter 4 and Chapter 3.1.
AutoMap
AutoMap establishes the default map of Fibre
ports and Fibre LUNs by distributing the devices
over the Fibre ports you designate. To distribute
all devices to across all the Fibre Channel ports,
type
Automap
To assign a devices to specific ports, type in the
port numbers you wish to use
Automap [0 | 1 | 2 ]
AddressMap A
AddressMap A enables mapping of any SCSI or
internal device to a specific Fibre Channel port
and LUN. Internal devices and external SCSI
devices are presented as LUNs to a Fibre Channel
host using route mapping. Each Fibre Channel
port has its own Fibre Channel node name and
port name. Type
AddressMap A
AddressMap B
AddressMap B enables port failover, the
automatic substitution of the mapping from a
failed port to a port reserved to take over for it.
Internal devices and external SCSI devices are
presented as LUNs to the Fibre Channel host
using route mapping. Each Fibre Channel port has
its own Fibre Channel node name and port name.
The command configures the FibreBridge to
either
➔ map all devices to one port, leaving one port
offline and one port reserved to take over in
case the active port fails:
set AddressMap B 1
➔ or map all devices across two ports, leaving the
third reserved to take over in case either port
fails:
set AddressMap B 2
To return an active port back to its pre-failover
state, type
FcPortFailure recover
AddressMap C
AddressMap C uses static device addressing
rather than route mapping to present internal
devices and external SCSI devices as Fibre
Channel LUNs to a host. All ports on the
FibreBridge use the same Fibre Channel node
name, but each port has a unique Fibre Channel
port name.
The FibreBridge appears as a single Fibre
Channel device with three ports to a host. All
devices are available on each Fibre Channel port
at the same LUN as follows:
All Fibre Channel ports will report a particular
device (both internal and SCSI) at the same LUN.
The LUNs reported to a host in response to a
ReportLUNs command will always contain both
Peripheral Device Addressing (internal FB LUNs)
BIT76543210
LUN BYTE 1 0 0 Bus Identifier
LUN BYTE 0 Target/LUN
Logical Device Addressing (external SCSI devices)
Bit 76543210
LUN BYTE 1 1 0 Target
LUN BYTE 0 Bus LUN