The log entry indicates a medium error on a disk, suggesting an unrecoverable read issue.
While the RAID subsystem attempts to reconstruct unreadable data, this error might indicate a firmware issue or a compatibility problem with the disk.
Why Reviewing Firmware and Known Issues Is Important:
Medium errors can sometimes result from outdated or incompatible firmware.
By reviewing firmware release notes and known issues for the disk model (NETAPP X381_HLBRE10TSDB in this case), you can identify if this is a known issue and resolve it by updating the firmware.
Other Options:
Sanitize the disk (Option A): Not relevant here, as sanitization is used for secure data erasure.
Reseat the disk (Option B): Useful for addressing hardware seating issues, but not the first step here.
Diskcopy to a spare (Option D): This is a last-resort recovery step and not the primary action.
NetApp Reference Documentation:
"ONTAP Disk Management Guide" and "Disk Firmware Release Notes" detail how to handle medium errors and update firmware.
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