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S5500 Hard Disks cannot be Detected

Publication Date:  2012-07-20 Views:  88 Downloads:  0
Issue Description
On a deployment site, a S5500 storage device failed and RAID groups were degraded, causing that services were interrupted. An onsite engineer properly removed the free hot spare disk in slot (0, 19) and inserted the disk into the faulty disk slot to reconstruct faulty disk. The next day, after the onsite engineer insert a new disk into slot (0, `19), the status of the disk is displayed as "Absent" and the disk indicator is off.
Alarm Information
None
Handling Process
Step 1  Insert the new disk into another vacant slot of the S5500. If the system can discover the disk, it indicates that the disk is normal.
Step 2  Insert other new disks into slot (0, 19). The fault persists.
Step 3  Enter the MML mode and view the information about the disk and slot. The information about the previous disk in slot (0, 19) is always displayed.
Step 4  Analyze the logs with the R&D engineers and find that the operating system has a bug. The information for removing and inserting disks is not refreshed. The fault can be rectified by restarting the storage system.
Root Cause
1. The disk is faulty.
2. The slot is faulty.
3. Other causes exist.
Suggestions
For unclear faults, check whether operations are improper first, and then analyze the fault symptom. If necessary, onsite engineers should work with R&D engineers to locate the fault. If the system needs to be restarted, inform the customer beforehand.

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