Qualstar 501440 Rev. G - Manual (Page 31)

The
Id Mode
menu item has two selections,
FIXED
or
SOFT
. If the mode is FIXED,
the
Loop Id
entry is displayed. If the
Id Mode
is SOFT, the Loop ID is automati-
cally assigned by the FCO.
During the Fibre Channel Arbitrated Loop (FC-AL) initialization process, a unique
Arbitrated Loop Physical Address (AL_PA) value is assigned to each port on the loop.
Not all of the 256 hex values are allowed as AL_PA values per FC-AL. The Loop Id
value is used to represent the 126 addresses that the FCO can use. Table 7-1 shows
how a Loop Id value maps to an AL_PA. If the Id Mode is “SOFT”, the FCO will at-
tempt to obtain an available Loop Id, in the following order: 0, 1, 2, etc.
4.8 Configuring the Fibre Channel SCSI Devices Interface
To establish the SCSI device configuration the Fibre Channel Option is commanded to
“Rescan” its three SCSI device buses. The three SCSI device channels, starting with
Channel 0, begin scanning for SCSI devices using ascending SCSI Target Ids. After all
three channels have been scanned, the FCO builds a SCSI device table, that it uses to
map SCSI Targets to the host as logical devices (LUNs).
C••••••Fibre•Channel
•Device
Id Mode 0: SOFT
Loop Id 0: nnn
Topology 0: LOOP C••••••Fibre•Channel
•Device Left
•Device Right
L Id Mode 0: SOFT
L Loop Id 0: nnn
L Topology 0: LOOP
R Id Mode 0: SOFT
R Loop Id 0: nnn
R Topology 0: LOOP
Dual Bay Library
with two FCO’s
Single Bay or one side
of a Dual Bay Library
For single bay libraries or dual bay libraries with only one Fibre Channel Option in-
stalled, press the s (UP) or t (DOWN) key to move the pointer to
Device
. Press the
ENTER key to enter the
Configuration\Fibre Channel\Device
menu.
For dual bay libraries with two Fibre Channel Options installed, press the s (UP) or t
(DOWN) key to move the pointer to either
Device Left
or
Device Right
. The
left and right orientation is as viewed from the front of the library. Press the ENTER
key to enter the
Configuration\Fibre Channel\Device (Left or
Right)
menu.
The
Configuration\Fibre Channel\Device
menu panels display a list of
SCSI devices attached to the Fibre Channel Option. C TLS library with a single Fibre
Channel Option displays the title
CFC···········Device
. A dual-bay library
with two Fibre Channel Options installed, displays the title
CFC······Device
Left
or
CFC·····Device Right
to correspond to the Fibre Channel Option in
the left and right side.
FCO Type C Installation
501440 Rev. J
4-18