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How to Troubleshoot the Fault that DIP Switch

Publication Date:  2012-07-20 Views:  46 Downloads:  0
Issue Description
Fault symptom:
On a deployment site, a S5600 controller enclosure is connected to a D200 disk enclosure. After the storage system is powered on, the controller enclosure properly starts, but the D200 disk enclosure cannot be identified. All indicators on the controller enclosure are normal. The disk indicator on the D200 disk enclosure is blinking in green and the link indicator is alternately on and off. When the link indicator is off, the global alarm indicator on the disk enclosure is on and the disk enclosure ID is not displayed. The D200 disk enclosure is not displayed on the OSM and no alarm is generated. The power-on sequence is correct.
Alarm information:
The global alarm indicator on the D200 disk enclosure is alternately on and off.
Alarm Information
None
Handling Process
There are two solutions:
1. Set the DIP switch of the controller enclosure to 2 GB gear.
2. Replace the DIP switch to make the two DIP switch versions consistent.
The second solution is recommended on the deployment site.
 
Root Cause
1. The expansion ports on the controller enclosure and the D200 disk enclosure are normal. The optical fiber is normal. Therefore, the fault is not caused by expansion ports and optical fiber.
2. On the deployment site, test the DIP switches of the controller enclosure and the D200 disk enclosure at 2 GB gear and 4 GB gear. The result is that when the DIP switch of the controller enclosure is at 4 GB gear, the controller enclosure cannot identify the D200 disk enclosure. The location of the DIP switch of the disk enclosure does not affect the test result. Therefore, the cause is the mismatching of expansion rates.
3. On the deployment site, the DIP switch versions of the controller enclosure and the D200 disk enclosure are inconsistent. The DIP switch of the controller enclosure is of the latest version, while the DIP switch of the D200 disk enclosure is of an early version. The rates of two DIP switches are mismatched in 4 GB working mode, causing that the D200 disk enclosure cannot be identified.
Suggestions
1. It is recommended to check the physical link first to exclude the fault on the optical transceiver or the optical fiber.
2. The difference between the latest DIP switch version and the early DIP switch version is that the PCB board of the latest DIP switch version has two more resistors than that of the early DIP switch version. The locations of the two resistors are at R7 and R9 (refer to the attachment).
 

END