User`s guide

304 Implementing an Open IBM SAN
SCSI to LUN map
Prior to setting the LUN masking, it makes sense to prepare a list that has each
LUN and shows which host is allocated to that LUN. To assist in this process the
Gateway has a map that provides a cross reference of the actual SCSI target
and ID to the Gateway’s assigned LUN number. To access this map you must
access the service terminal from the serial port as described earlier in 4.2,
“Installation” on page 273. Once connected, type in the command
mapShowDatabase. The database lists not only devices that are presently
connected, but also devices that have previously been connected. If a previously
attached device is later reattached, it is assigned back to its previous address.
Figure 4-37 shows the output returned to the service terminal.
Figure 4-37 Service terminal display of device map
The numbers on the left are the assigned LUN numbers, and note that number
‘0’ has been assigned to the Gateway. The other columns contain the device
type, the SCSI channel it is connected to on the SAN Data Gateway, and the
actual target and LUN ID.