[parisc-linux] A3308 fibre SCSI bridge support

[Buechler, Mark R]

Configuring the MUX isn't a problem. What I'd like to do is access the SCSI
devices connected to the MUX from Linux. From a Linux host I see the MUX as
a single target. I wouldn't think any changes would be necessary for the FC
driver but rather a separate driver would exist that scans for the MUX and
uses the Linux sg driver to communicate with it.

I've found mention of a SCSI/MUX driver on this mailing list in the archives
but I don't know what MUX they were referring to.

- Mark.

-----Original Message-----
From: parisc-linux-admin@lists.parisc-linux.org
[mailto:parisc-linux-admin@lists.parisc-linux.org]On Behalf Of Grant
Grundler
Sent: Monday, December 30, 2002 1:45 AM
To: Mark R. Buechler
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] A3308 fibre SCSI bridge support


On Sun, Dec 29, 2002 at 04:02:38PM -0500, Mark R. Buechler wrote:
> I recently purchased a SCSI bridge (4/2 A3308) thinking I could use this
> with Linux but when I tried I found that it requires a driver. I can see
> the MUX and all devices connected to it from an HP workstation with the
> MUX driver loaded, but I'd really like to use this from Linux.

uhm...did you check to see which utilities you might need to manage
and configure the FC/SCSI mux?
http://www.software.hp.com/products/FCMAN/fcm3over.html

BTW, The A3308 usermanual (A3308-96011) is available here:
	http://www.software.hp.com/products/FCMAN/pdf/96011.pdf

> I'm wondering if anyone is working on a driver for this device and would
> it work with x86 as well?

The main FC HBA vendors (except Agilent?) seem to work fine on both x86 and
ia64 (HP ZX1, near cousin to HP PARISC platforms). I would expect them
to work fine on i386/parisc-linux too. I've only had time to play with
Agilent based (tachlite 5100/5166/5200 series) HBAs on parisc.

AFAICT, "FC 4/2 MUX" is only supported under HPUX.
I get the impression one would need to heavily modify an existing
FC driver in order to support the MUX functionality. But I don't
know how the A3308 presents SCSI devices and that will make/break
the support story.

hth,
grant
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