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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.
Remove any non-vital PCI cards from the system to determine if there is a PCI
bus conflict.
Disconnect any SCSI devices from the host adapter and reboot the computer. If
this resolves the issue, investigate the SCSI cable 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, try updating the flash
on the host adapter as described in the "Installation and Operations" manual.
Then try it again in the original computer.
o If it still fails, report this as a possible interoperability issue between the
host adapter and the computer.
o If the problem follows the host adapter, replace it with a new adapter.
The computer freezes when the ATTO Banner is displayed during the system
BIOS scan.
Disconnect all devices from the SCSI card and reboot the system.
If the system still freezes:
Remove any non-vital PCI cards from the system to determine if there is a PCI
bus conflict.
Remove the SCSI host adapter and test it in a different computer (not the same
model). If the card works properly, enter the ATTO ExpressPCI Utility during the
system BIOS scan by hitting Control-Z when prompted. Enter the host adapter
configuration menu and disable the BIOS. There may be a BIOS conflict between
the ATTO host adapter and the original computer. Place the host adapter back
into the original machine and reboot.
If this resolves the issue, report this is as a BIOS conflict. Note that you
can continue to operate. Disabling the BIOS will only prevent the
computer from booting from an external drive connected to the host
adapter.
If the computer still hangs, replace the host adapter with a new one.
If the system no longer freezes after disconnecting the SCSI devices:
Check the SCSI devices to make sure that they are all set to different SCSI ID's.
Each device on each SCSI bus must use a unique ID, including the host adapter.
Devices on Bus 1 can have the same IDs as those on Bus 2. By default, the host
adapter uses SCSI ID 7, so devices should use ID's 0 through 6, or 8 through 15.
Check cable integrity. Check the cables for solid connections. Make sure they
are screwed down. Inspect cable ends for bent pins. U320 SCSI requires high
quality cables that are specifically rated for the U320 transmission speeds.
Page 2 of 12
Atto Technology, Inc.
January 19, 2007