Investigate the SAS/SATA device for power. If available, connect to the device’s
management feature and run any diagnostic test(s) available.
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 port is
scanned. This may give a clue as to the root cause of the issue. If a drive LED
remains on when the computer freezes, suspect a problem with that drive.
Try another SAS/SATA cable.
Verify the correct driver is installed and the latest firmware is being used.
If problem still persists:
Disconnect SAS/SATA cables.
If there are multiple devices on the chain, 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.
If all else fails, replace the ExpressSAS Raid controller.
Æ The ExpressSAS Raid controller is detected by the operating system, it detects
some of the connected devices, but does not detect all of the connected 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 in the RAID CLI.
Check cable integrity. Check the cables for solid connections. Make sure they
are snapped in. Inspect cable ends for breaks.
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.
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 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.
¾ Port Visibility: Verify the Expander can see the ExpressSAS Raid card
on the port(s) in question. Refer to the Expanders manufacturer’s guide
for more detail on this step.
¾ Speed Auto negotiation: Verify the Expander is set to “Auto” negotiate
transfer speed.
Æ Errors are reported while trying to flash new firmware onto the SAS controller.
The ATTO Configuration Tool performs validations on the structure of the file. If
it does not pass these validations, the file is rejected. The image file may be
Page 4 of 9 ATTO Technology, Inc. July 12, 2007
(51 paginas)
(76 paginas)
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