Qualstar 501440 Rev. G operation manual Configuring the Fibre Channel Scsi Devices Interface

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 7-1shows 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.

4.6Configuring 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	SOFT
Id Mode 0:
Loop Id 0:	nnn
Topology 0:	LOOP

Single Bay or one side of a Dual Bay Library

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

For single bay libraries or dual bay libraries with only one Fibre Channel Option in- stalled, press the V (UP) or W (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 V (UP) or

W(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 EN- TER 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. A 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.

501440 Rev. G FCO Type A Installation 4-13