Specifications

70
Configuration: mapping
Manual SCSI device route mapping
Manual mapping allows you to maximize the
efficiency of your SCSI devices while allowing
greater flexibility.
Using the CLI, you can ask the FibreBridge to
find all the SCSI devices on its SCSI bus. With
this information you then decide where you want
to place these devices. Refer to Command Line
Interface use and guidance on page 39.
In the chart below, the SCSI device on SCSI bus 0
at SCSI address of ID 0 LUN 0 is being mapped
to Fibre Port 0 (on the FibreBridge) at Fibre
Channel LUN 4.
Note
Two SCSI devices cannot be mapped to the
same FC port and FC LUN. If the same SCSI
device is mapped to two different FC ports
and/or FC LUNs, these FC port and FC LUNs
will be taken offline automatically until the
conflict is resolved.
ATTO ExpressNAV and ATTO BridgeTools make
manual mapping easy. For more information,
refer to Mapping on page 67.
You may also map SCSI devices manually by
using the Command Line Interface RouteXXX
family of commands.The RouteXxxxx and
AutoMap commands provide the mechanism to
map Fibre Channel Port/LUN to SCSI
bus/target/LUN.
AutoMap establishes a default mapping of Fibre
ports and Fibre LUNs, and the RouteXxxxx
commands manage the mapping, including
display of current mapping and modification.
RouteDisplay displays the current mapping, in
Fibre port, Fibre LUN order, showing the mapped
SCSI bus/target/LUN, and the current status of the
device (online, offline, unavailable, going
offline). RouteDisplay may be used at any time.
RouteOffline, RouteChange, RouteOnline (not
available on the FibreBridge 2400) modify the
mapping as required (e.g. to make a device
inaccessible, to replace a non-functioning mapped
unit with another, to manage wear on tape drives).
Before modifying a map, set it offline via the
RouteOffline command. This process notifies
the FibreBridge to stop accepting SCSI
commands (e.g. data transfers, inquiry, etc.) for
the mapped device.
The RouteOffline command takes effect in two
stages
1 The device is marked Going Offline, indicating
the FibreBridge will complete any current SCSI
commands for the mapped device, and will
reject any subsequent SCSI commands for that
device.
2 When all current SCSI commands for the
device are complete, the device status
transitions to Offline, and the FibreBridge
rejects any subsequent SCSI commands for
that device.
After the device is Offline (verify this with the
RouteDisplay command), use the
RouteChange command to change its mapping.
Use the RouteDisplay command to review the
changes before setting the affected devices online.
When all changes are complete and correct, use
the RouteOnline command to set devices online.
It is not necessary to set all mapped devices
online: SCSI commands sent to offline devices
are rejected.
Appendix A shows the sequence of AutoMap and
RouteXxxxx commands.
Fibre
Port
FC LUN
SCSI
BUS
SCSI ID
SCSI
LUN
04000
00010
020130
000150
03010
0100 1 1
0300 8 5
0230 8 7