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Incorrect Configuration Information Occurs After an S5100 Disk Enclosure or Backplane is Replaced

Publication Date:  2012-07-18 Views:  101 Downloads:  0
Issue Description
1. Version: An S5100 storage device contains three D200 disk enclosures and 96 SATA disks. The controller software version is B031. The operating system is Red Hat AS 4 up5. 2. Expansion networking of the S5100 A disk enclosure contains faulty parts and thus needs to be replaced. To remain the configured RAID and LUN information, the backplane of the original disk enclosure is moved to the new disk enclosure, and the disk positions are remained. Before the backplane replacement, the new disk enclosure was once directly powered on. 3. Symptom: A non-existed disk enclosure is detected on the management interface.
Alarm Information
None
Handling Process
Step 1 Ensure that the non-existed disk enclosure is powered off on the service management page of the management interface. The information about the non-existed disk enclosure disappears. Step 2 Clear the information about the non-existed disk enclosure on the management interface. The problem is removed. Step 3 Verify the S5100 status by restarting the storage device. No information about the non-existed disk enclosure can be detected now. Step 4 Record the 12-bit MAC address (such as 00e0fc876267) of the new disk enclosure on the enclosure exterior. Step 5 Log in to controllers in CLI mode, and then execute the chgsesmac –s [enclosure ID] –a [MAC address] command where enclosure ID stands for the enclosure ID of the original enclosure, and MAC address stands for the MAC address of the new enclosure. Step 6 Verify the status of the newly connected enclosure on the management interface by connecting the expansion cables of the new enclosure to the S5100. The enclosure status becomes normal after approximately four minutes.
Root Cause
1. S5100 controllers recognize disks through backplanes of disk enclosures. By replacing the original disk enclosure with a new one without changing disk positions, only the backplane of the new disk enclosure can be recognized, causing the RAID group failure. In this condition, only the information about the new enclosure is recorded by controllers. 2. By inserting the backplane of the original disk enclosure into the new disk enclosure and then powering on the storage device, all original configuration information about disk enclosures, RAID groups, and LUNs can be properly recognized. However, the previously recorded information about the new disk enclosure exists. 3. If the original disk enclosure has configuration information, users need to modify the MAC address of the expansion enclosure before replacing the original disk enclosure to ensure that only the latest enclosure can be recognized by controllers.
Suggestions
1. When you need to replace an S5100 disk enclosure due to its faulty parts, move the backplane of the original disk enclosure to the new disk enclosure and then power on the S5100 for remaining the original configuration information. 2. Insert all disks to their original positions after replacing the disk enclosure.

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