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The computer's BIOS scan recognizes the ExpressSAS RAID controller, but only

detects connected SAS/SATA devices on one of the connectors. The other bus

reports no devices.

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 use all internal

connectors or one internal and one external.

Swap the devices

working with the one having issues. If the issue follows the bus and there is an

expander in the Array, move on to next step. If there is no expander, replace the

card.

If there is an Expander in the Array verify the following:

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 pre-existing zones setup, be sure to add the

ExpressSAS Raid to the zone.

If the issue follows the attached SAS/SATA devices, troubleshoot the attached

devices:

Verify the SAS/SATA devices are powered on.

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).

Check cable integrity. Check the cables for solid connections. Make sure they

are snapped in. Inspect cable ends for bent pins.

Try attaching SAS/SATA devices one at a time with different cables, adding

drives and cables until the problem occurs. This will help pinpoint the device or

cable causing the problem.

Watch the LED indicators on the SAS/SATA devices before, during, and after

startup. Drive lights should also flash at startup as the SAS/SATA bus is

scanned. This may give a clue as to the root cause of the issue.

The ExpressSAS RAID controller is detected during the system's BIOS scan but

it is not detected by the operating system.

Note: When working properly, the ExpressSAS RAID controller will show up in

the device manager.

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and cables

from the SAS/SATA bus that appears to be

Atto Technology, Inc.

June 6, 2007