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Applies to: All Data Domain (DD) models with External Storage attached All Data Domain Operating System (DDOS) versions Each DD system maintains two SAS paths to every enclosure and its disks. A typical data path includes: PCIe SAS HBA → SAS HBA Port → SAS Cable → Enclosure Controller (LCC) → Disk Failure at any point in this path can trigger alerts or event IDs. While alerts may indicate the fault, further investigation is often required. Common SAS and MPATH Events: EVT-MPATH-00003: Missing disk connection from system port Nx EVT-MPATH-00005: Enclosure Disk only has active connection(s); required number is 2 EVT-MPATH-00006: Path redundancy to an enclosure is lost EVT-SAS-03801: Enclosure cables on port have been connected incorrectly EVT-SAS-03802: The HBA port is disabled EVT-SAS-03803: The SAS HBA in slot has failed
Common causes of SAS or Multipath events are: Incorrect cabling or topology Site maintenance or upgrades (such as adding or upgrading storage, power maintenance, accidental cable disconnection) Loose or improperly seated SAS cables Faulty hardware (HBA, SAS cable, LCC, or disk) Transient firmware or software faults
Always restore full SAS multipath connectivity. Do not leave missing or degraded paths unresolved. Recommended Actions: Run Diagnostic Commands (to identify where the fault lies): alerts show current disk port show summary disk port show stats enclosure show topology enclosure show controllers <n> disk multipath status disk rescan <n.n> (where n.n is the Enclosure.Slot reference) Compare with previous Autosupport: Use a preevent Autosupport to identify missing or degraded connections. Physical Inspection : Disable the file system ( filesys disable ) before reseating or moving any SAS cables. Check SAS and power cables for secure connections. Look for missing LEDs or fault indicators on controllers. Reference Documentation : Consult Shelf Hardware Guides for cabling topology and best practices. Escalation : If further assistance is needed, generate a Support Bundle and raise a Service Request with your contracted Support Provider.
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