Compaq LP8000-F1 manual Current Private Loop Device Mapping, Bus # Target# Lun#, None

Troubleshooting 4-9

Private Loop Device Mapping

In a private loop environment (FCAL, no switch), devices are initially created based on a fixed address ordering. Once created (at boot), the devices continue to be tracked based on:

– WWPN:	HardAddress=0;MapNodeName=0
– NodeName:	HardAddress=0;MapNodeName=1
– D_ID:	HardAddress=1; (MapNodeName=don’t care)

This section identifies the initial fixed mapping between the Windows NT bus/target/lun and a fibre channel native address (AL_PA/SEL_ID). There are two potential mappings based on a registry parameter [ScanDown=0 (driver default); use *, ScanDown=1;].

The index into Table 4-5 can be derived by:

#define TARGETS_PER_BUS 32

i = (Srb->PathId > 0) ? Srb->PathId-1 : 0; //Bus 0 = dummy bus nodeInx = ((I * (TARGETS_PER_BUS-1)) + Srb->TargetId;

Table 4-5

Current Private Loop Device Mapping

Bus #		Target#		Lun#	*AL_PA	*SEL_ID	**AL_PA	**SEL_ID
0	0-31		0-7		None	None	None	None
1***	0		0-7		0x01	0x7D	0xEF	0x00
	1		0-7		0x02	0x7C	0xE8	0x01
	2		0-7		0x04	0x7B	0xE4	0x02
	3		0-7		0x08	0x7A	0xE2	0x03
	4		0-7		0x0F	0x79	0xE1	0x04
	5		0-7		0x10	0x78	0xE0	0x05
	6		0-7		0x17	0x77	0xDC	0x06

*Use this translation if registry ScanDown = 0 (default)

**Use this translation if registry ScanDown = 1

***If MapBus0=1;, then device addressing starts with Bus #0, not #1

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