I have a Dell T110 server with a SAS 6i/R controller and two hard disks in RAID 1. Ocasionally a warning appears in the Windows Event Log with the following message:
SAS port report: SAS wide port 2 lost link on PHY 2.: Controller 0 (SAS 6/iR Adapter)
And about 20 seconds later, the following informational message appears:
SAS port report: SAS wide port 2 restored link on PHY 2.: Controller 0 (SAS 6/iR Adapter)
Until now, I haven't noticed any disruption in the programs that are running in this server. Is this a sign of future problems with the controller or the disks? Has any of you ever seen something like this?
Yesterday, 3 days after I posted this question the RAID 1 setup lost redundancy. After a sequence of the messages mentioned above, the following messages were logged:
(10-07-2012 21:42:42) - An invalid SAS configuration has been detected. Details: SAS topology error: Unaddressable device.: Controller 0 (SAS 6/iR Adapter)
(10-07-2012 21:42:45) - Reset to device, \Device\RaidPort0, was issued.
(10-07-2012 21:43:02) - Device failed: Physical Disk 0:2 Controller 0, Connector 0
(10-07-2012 21:52:59) - The driver detected a controller error on \Device\RaidPort0.
(10-07-2012 21:53:02) - Redundancy lost: Virtual Disk 1 (Virtual Disk 1) Controller 0 (SAS 6/iR Adapter)
(10-07-2012 21:53:02) - Virtual disk degraded: Virtual Disk 1 (Virtual Disk 1) Controller 0 (SAS 6/iR Adapter)
(10-07-2012 21:53:02) - The rebuild failed due to errors on the target physical disk.: Physical Disk 0:2 Controller 0, Connector 0
From these messages one can assume that problem is with one of the disks of the array. I'm right now using the Dell Online Diagnostics tool to test the disks. While one of the disks finished the tests the other is stuck at 20%. So I think i found the culprit.