ATTO Technology Express SAS R348 User Manual download pdf

ATTO ExpressSAS Troubleshooting Guide for Linux

This document describes troubleshooting techniques that can be used to identify

and resolve issues associated with the ATTO ExpressSAS Raid Controller.

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

Æ The controller 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 4 Add the following line to

/etc/modprobe.conf after installing the driver:

alias scsi_hostadapterX esasraid Where X is the next available #.

To enable driver autoload in Red Hat Enterprise Linux 3 Add the following line to

/etc/rc.modules after installing the driver:

modprobe esasraid

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

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

Æ On certain 64-bit platforms, the driver Makefile may be unable to detect the

correct CPU architecture. When compiling the driver, an error such as

“cc1 : error : CPU you selected does not support x86_64 instruction set”.

 This can be resolved by specifying the correct architecture when running the

make command. For example: $make install ARCH=x86_64

Æ The connected SAS devices aren’t detected by the operating system.

 Verify the driver is loaded by examining the output of the Ismod command for

“esasraid”.

 Check /proc/scsi/scsi to see a list of devices that are known by the operating

system. This will only list the device at LUN 0 and it’s negotiated speed.

 Verify the drives are mapped to the controller correctly. You may need to

execute the ‘automap’ command to remap the drives. This can be done in the

ATTO Configuration Tool or the controller utilities (CTRL-Z).

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D.) Helpful Hint 5

Summary of Contents

Page 1

ATTO ExpressSAS Troubleshooting Guide for Linux This document describes troubleshooting techniques that can be used to identify and resolve issues a

Page 2

 If there is an Expander in the Array verify the following: ¾ Zoning: Verify the Expander(s) are zoned properly so that the ExpressSAS Raid card an

Page 3

Note: I you are using a R348 SAS Controller be sure the controller is configured to use the appropriate ports you need. This card can be configured to

Page 4

¾ Zoning: Verify the Expander(s) are zoned properly so that the ExpressSAS Raid card and the SAS/SATA drives have access to one another. If there are

Page 5 - D.) Helpful Hint

When an error is encountered, please insure you have an answer to each of the following questions when reporting it as an issue: QUESTION ANSWERED 1

Page 6

To view a list of user configurable parameters, the driver version, and a list of attached devices by Target ID, type the following commands into a te

Page 7

# TargID ------------ 1 0 2 1 3 2 Statistics: ----------- Time elapsed (ms) : 121640 Commands completed : 422 Ou