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 The ExpressSAS RAID controller is recognized, but it does not detect
any of the
connected SAS devices. The command dmesg can be used to see what devices are
detected when the driver loads. It will list each device per SAS port.
Verify the SAS 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 physical damage.
Try attaching SAS 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 devices before, during, and after startup.
Drive lights should also flash at startup as the SAS bus is scanned. This may
give a clue as to the root cause of the issue.
Try putting the controller in a different PCI slot.
Try updating the firmware on the controller as described in the “Installation and
Operations” manual.
If there is an Expander in the Array verify the following:
¾ Zoning: Verify the Expander(s) are zoned properly so that the
ExpressSAS Raidcard 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.
If all else fails, replace the SAS controller.
Æ The computer recognizes the EXPRESSSAS RAID controller, but only detects
connected SAS devices on
one of the busses. The other bus reports no devices. The
command dmesg can be used to see what devices are detected on each SAS bus.
Page 2 of 7 ATTO Technology, Inc. June 6, 2007
(76 Seiten)
(118 Seiten)
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