[6211] in linux-scsi channel archive
Fibre Channel/SCSI Mapping
daemon@ATHENA.MIT.EDU (Mark Veteikis)
Tue Mar 30 00:51:22 1999
From: Mark Veteikis <mark@iphase.com>
To: linux-scsi@vger.rutgers.edu
Date: Mon, 29 Mar 1999 23:42:38 -0600 (CST)
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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