[6212] in linux-scsi channel archive
Re: Fibre Channel/SCSI Mapping
daemon@ATHENA.MIT.EDU (Henrik Johansson)
Tue Mar 30 01:14:46 1999
Date: Tue, 30 Mar 1999 07:01:49 -0100 (GMT+1)
From: Henrik Johansson <henrik@lcdata.se>
To: Mark Veteikis <mark@iphase.com>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <199903300542.XAA21602@sw10>
Hi!
Great work! |-)
I have a question:
Is there any way to build the driver to support a scalable channel/host
environment considering the future impact Fibre Channel SCSI will have
as a network transport-medium.
// Henrik J.
On Mon, 29 Mar 1999, Mark Veteikis wrote:
>
> I'd like some feedback on some design decisions I made with a driver
> I am working on. I have a driver running for our (Interphase's) Fibre
> Channel PCI adapter that emulates the SCSI interface to the Linux
> kernel interface. That is, the driver is a scsi loadable module.
>
> To facilitate a large number of drives attached to the fibre (virtual SCSI bus) I chose to identify the board as having a single channel and a large # of
> SCSI targets possible.
>
> Here's an extract from the header file.
>
> #define MAX_UNITS 128 /* (+1) # of targets on bus */
> #define OUR_SCSI_ID (MAX_UNITS) /* which target ID we occupy on bus */
> #define MAX_CHANNEL 0 /* (+1) 0 indicates 1 SCSI bus */
>
> So far I have tested with 8 drives on an arbitrated loop but I'll possibly
> be testing with up to ~100 drives.
>
> Okay, here's the question. Does this make the best configuration for
> a sysadmin? Would it be better/easier to manage to have more channels with
> less targets per channel (16 or 8)? Is there any other configuration
> models that I should look at for systems with very large #'s of disk drives?
>
> TIA.
>
> --
> Mark Veteikis mark@iphase.com 1-214-654-5257
> Interphase Corp. 13800 Senlac Dallas Tx. 75234
>
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