Wanda

Windows enumerates each storage (eg SCSI, IDE, fibrechannel) adapter on
boot-up. In your configuration, at least 7 are discovered, with the HBAs
given numbers 5,6 and 7. You'll probably find that 1 and 2 are used by the
primary and secondary ports of your IDE controller, with 3 and 4 maybe some
RAID controller.

You can check out the enumeration of the adapters in the registry by
looking at the key HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SCSI. This will
contain a number of sub-keys of the form 'Scsi Port n'. Each sub-key has a
'Driver' value indicating the sort of adapter - eg 'atapi' for an IDE/EIDE
adapter.

Each particular adapter can host a number of SCSI buses, hence the
requirement to specify a bus number when uniquely addressing a device. In
reality there is only usually one bus per adapter (bus 0 in each of yours).
This is because the most common way of implementing a dual-port SCSI
adapter or HBA it to make it appear as two logical adapters in the same PCI
slot. This SCSI bus number is internal to a specific adapter and not
related to the PCI bus number of the the slot containing the adapter, which
I think is where the confusion arose.

Where a fabric is zoned so that each HBA can see more than one device, it
makes sense to create 'persistent bindings' between the WWNs of the device
and its target ID and LUN (and if it is configurable, bus too). This
prevents a device in a library mysteriously 'jumping' from one element
number to another across reboots. This is not an issue for you as you have
direct point-to-point connections between HBA and device.

Regards
Neil Schofield
Yorkshire Water Services Ltd.




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