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ATTO Technology Inc. jokonczak
April 24, 2007
ATTO UL4S/D and UL5D Troubleshooting Guide for Mac OSX
This document describes troubleshooting techniques that can be used to identify
and resolve issues associated with the ATTO Ultra320 SCSI host adapters.
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.
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The computer will not boot when the host adapter is installed.
The host adapter may be improperly seated. Power down the computer and
reseat the host adapter.
Try putting the host adapter in a different PCI slot.
Make sure that the adapter, if PCIe, is installed in a slot configured as x4 or x8.
Zap the PRAM (P+R) at boot. Allow to chime 3 times.
Disconnect any SCSI devices from the host adapter and reboot the computer. If
this resolves the issue, investigate the SCSI cables or SCSI target devices as
described in the section below.
If the computer still does not boot, try installing the host adapter in a different
computer. If the host adapter works in the new computer, report this as a
possible interoperability issue between the host adapter and the computer. If the
problem follows the host adapter, replace it with a new adapter.
Verify that the latest version of the computer BIOS is installed. Use caution when
updating the computer’s BIOS. A mistake could leave the system in an unusable
state.
Æ
With the ATTO host adapter installed my system stops and displays a flashing
question mark.
This is an indication that the MAC is not able to find an OS to boot from.
Use a CD or some other source to boot from and make sure the startup disk is
correctly defined in "System Preferences" "Startup disks".
Check cabling. Make sure cables are secure. Swap out with new cable if
possible.
Check termination.
Æ
The U320 SCSI host adapter is installed in the computer but it does not appear in
the System Profiler.
The host adapter may be improperly seated. Power down the computer and
reseat the host adapter.
Check for the correct installation of the driver.
Try putting the host adapter in a different slot.
Make sure that the adapter, if PCIe, is installed in a slot configured as x4 or x8.
