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ATTO Celerity FC Troubleshooting Guide for Linux

This document describes troubleshooting techniques that can be used to identify

and resolve issues associated with the ATTO Celerity Fibre Channel host

adapter. Some of these techniques may seem simplistic or overly obvious, but

these are the ones that are commonly overlooked and can take several hours of

frustration to find. It is important to only try one technique at a time. While

changing multiple variables may seem to be a time saver, it usually complicates

the troubleshooting process.

A.) Linux Operating Systems

The host adapter driver was loaded properly and everything was working, but

the devices do not show up after the computer was rebooted. On some Red Hat

Linux distributions, the driver may not automatically load when the system is

booted.

To enable driver autoload in Red Hat Enterprise Linux 3, 4, and 5, add the

following line to /etc/rc.modules after installing the driver:

modprobe celerityfc <Enter>

(Note: you may need to create /etc/rc.modules and make it executable with

'chmod +x /etc/rc.modules')

The host adapter can detect the target device at LUN 0 but not the devices at

LUN 1 or higher in Red Hat Linux version 3 with kernel 2.4.

When using version 2.4 of the Linux kernel (eg. Red Hat 3), devices on LUN 1 or

higher may not be detected automatically when the driver is loaded. This is a

known issue with the 2.4 kernel. To manually detect such devices, issue the

following command:

$ echo "scsi add-single-device <h> <b> <t> <l>" > /proc/scsi/scsi

Where <h> is the host, <b> is the port (always 0 for ATTO drivers), <t> is the

target, and <l> is the LUN. You can confirm that the device has been detected

by checking for it in /proc/scsi/scsi.

(Note: To automate the above "echo" command, write a script that executes at

boot time. You need to include a line for each LUN. One possibility is add these

lines to /etc/rc.d/rc.local for RedHat or to /etc/rc.d/boot.local for Suse.)

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Atto Technology, Inc.

April 9, 2007