> -----Original Message-----
> From: Ryn [SMTP:matty91 AT bellsouth DOT net]
> Sent: Thursday, August 09, 2001 2:30 PM
> To:   Veritas-bu AT mailman.eng.auburn DOT edu
> Subject:      [Veritas-bu] Qlogic + STK 9840
> 
> I am trying to find some good documentation on how
> to configure a Solaris
> system to support a Qlogic PCI adaptor and a STK
> 9840 drive. I installed
> the Qlogic drivers from Qlogic, and see the
> related Qlogic messages on
> bootup.
> 
> A few questions have arose which I cannot seem to
> find solid answers for:
> 
> 1) What does the hard alpa on a 9840 drive refer
> to?
> 
The hard alpa is set on the drive and is used in
FC loop topologies to identify devices uniquely
and allow communication between devices in the
loop. Consider a loop in the same vain as
a network broadcast domain and the hard alpa
as a static IP address.

A non-hard ( :) ) alpa is negotiated when a device
enters the loop. Consider a non-hard alpa as a
dynamic IP address that is negotiated when
a host enters a network broadcast domain (with a DHCP
server in the broadcast domain).


> 2) What exactly does a device use a LUN for in the
> Fiber channel world?
> 
To allow the OS to communicate with the FC device.
The host speaks SCSI to the device via a scsi
target/lun, the FC HBA maps this target/LUN to an FC
device's identifier (depends on FC topology in use, WWN, alpa, etc)
to communicate with the destination.

> 3) Since the Qlogic card has a unique WWN, do
> requests get addressed
>      to this WWN which in turn sends them to the
> drives? I would think something
>       wishing to talk to a device would
> communicate to the WWN of the device.
>       If this is the case, why does the controller
> need a WWN?
> 
Requests get addressed to the SCSI target/LUN
which is subsequently mapped to a WWN,alpa etc,
by the HBA.

The controller needs a WWN so the FC device can
communicate back to the host.

> The steps I took to configure the drive and
> Solaris 8 box were:
> 
> 1) Install Qlogic drivers
> 2) change the WWN -> SCSI Id mapping in
> qla2200.conf
> 
> hba0-SCSI-target-id-10-fibre-channel-name="2000002
> 037004ac9";
>         /* WWN is not the one actually used */
> 3) Update the st.conf with the targets 10 (Qlogic
> adaptor) and 14 for the
>      hard alpa on teh 9840
> 
> reboot -- -r
> 
> Is this all that is needed for the OS to see the
> drive and the controller?
> 
What you bind to will depend on the FC topology your
dealing with. Do you have a FC switch/hub in the middle of
the HBA and 9840? If so, what type?

Regards
Peter Marelas