Data Domain: Troubleshooting Disk Issues

Summary: This article provides links to some of the most referenced Dell Knowledge Base articles related to troubleshooting and diagnosing disk issues.

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List of the most popular Dell articles relating to Disks:

Tip: Use 'Ctrl + F' to find keyword or error code from the table below, then access the related KB.
ID | Link Title Summary Tag | Error Code | Keyword
000043773 Failed, Absent, Unknown, or Powered-off Disk This article describes how to resolve the condition where a disk drive is in a failed, absent, or powered off state. DISK, STATUS, STATE, EVT-STORAGE-00001, EVT-STORAGE-00002,
000052171 EVT-MPATH-00005: A single disk loses Multipath redundancy. EVT-MPATH-00005: The number of active paths to a disk has decreased. Multipath redundancy is lost unless there is more than one connection path. EVT-MPATH-00005, MPATH
 000203825  Disk has a hardware OR recoverable fault. DDVE-based platforms (e.g DD3300) will Alert to a failed, unknown, or predictive failure disk with the Event ID: STORAGE-00031 or STORAGE-00032. DISK, ALERT, EVENT, EVT-STORAGE-00031, EVT-STORAGE-00032
 000021916  Disk State Description Description of the various states a disk drive on a Data Domain system can be in and the significance of the state. DISK, STATE, ABSENT, FAILED, FOREIGN, UNKNOWN, IN USE, SPARE, KNOWN, RECONSTRUCTING, COPY RECOVERY, POWERED OFF, EXCEEDED ERROR THRESHOLD, SYSTEM DEVICE, EVT-STORAGE-00002
 000204252  Multiple drives fail during failover of HA systems Highly-Available (HA) systems can experience drive failures during HA failover due to a known drive firmware issue. Some systems may experience the inability of the file system to startup after a failover or reboot.
HA FAILOVER DISK FAILURE, CA01 FIRMWARE, CA02 FIRMWARE, CA04 FIRMWARE FIX, DDOS MDU UPGRADE, DD_RAID FAILBACK, DATA DOMAIN DISK REBUILD, DDFS STARTUP ISSUE, DRIVE FIRMWARE UPGRADE
 000037699  DD3300 Disk replacement procedure when a predictive drive failure occurs  This article describes how to replace a predictive failure disk on a Data Domain DD3300 appliance. DD3300, PREDICTIVE DISK FAILURE, DISK REPLACEMENT, DATA DOMAIN, IDRAC PREDICTIVE FAILURE, RAID RECONSTRUCTION, SSD REPLACEMENT, DDOS DISK STATE, PROACTIVE DISK REPLACEMENT, PRED FAIL
 000203868  Alert: I/O module has failed. When an I/O Module (aka SLIC or PCI card) fails or is removed from a Data Domain (DD), the system generates the Error: EVT-ENVIRONMENT-00029: Event Message: I/O module has failed.  FAILED CARD, FAULTY NIC, FAILED SAS, EVT-ENVIRONMENT-00029, I/O MODULE HAS FAILED, FAILED IO, SLIC, PCIE, HOTSWAP, UNEXPECTED REBOOT
 000060053  DD3300 unknown disk with no alerts  An unknown disk or multiple unknown disks present at the DD3300 model. The system is not showing alerts.  DISK, UNKNOWN, DD3300, NO ALERT
 000130388  PowerProtect and Data Domain Hardware Documents  General information for PowerProtect and Data Domain hardware  HW, DOCUMENTATION
 000204344  SAS or MPATH Alerts  All Data Domain (DD) systems have path redundancy (multipath) for attached enclosures and disks by SAS connectivity. If communication to any component on the SAS path is interrupted, then an appropriate alert notification is generated. DISK, STORAGE, SAS, ALERT, EVENT, EVT-MPATH-00003, EVT-MPATH-00005, EVT-MPATH-00006, EVT-SAS-03801, EVT-SAS-03802, EVT-SAS-03803
 000187052 How to add a disk enclosure or pack to the cloud metadata tier on a Physical DD.  EVT-SPACE-00004: Space usage in cloud metadata storage has exceeded the 90% threshold.  DISK, EVT-SPACE-00004, EVT-FMIG-00001, CLOUD
000043258 Resolving Disk "Unknown" This article describes why a disk is reported as "unknown" and lists steps on how to resolve the condition.
DATA DOMAIN DISK UNKNOWN, DISK STATE UNKNOWN, DATA DOMAIN TROUBLESHOOTING, DISK UNFAIL COMMAND, DISK ADD ENCLOSURE, DATA DOMAIN DISK REPLACEMENT, DATA DOMAIN ENCLOSURE ISSUE, DATA DOMAIN DRIVE RELIABILITY, DISK STATE 180419, DATA DOMAIN SUPPORT
000203705 Disk group missing or Storage unavailable The Data Domain Filesystem requires access to all its underlying storage always. The system alerts "Disk group missing" or "Storage unavailable" if any of the attached disk groups/LUN’s are not accessible. All disk groups should be accessible to the head unit always. DISK,, EVT-STORAGE-00006, EVT-FILESYS-00002
000068028 Space Usage in Data Collection Has Exceeded Threshold. Data Domain sends alerts that it is almost full (90-100%). This article helps to analyze the real cause, if there is any issue in deletion of files or the DD is filled up to its limit. DISK, CAPACITY, EVENT, EVT-SPACE-00004
000031116 Troubleshooting Alert: Enclosure disk only has one active connection path. This article describes how to resolve disk pathing alerts. These alerts apply to enclosures using multipath and indicate that a connection path to one or more disk drives in the enclosure failed.  DISK, SAS, MPATH, ALERT, EVENT, EVT-MPATH-00005
000043560 Disk Drive Overheating This article addresses alerts relating to disk or enclosure temperatures.
DISK OVERHEATING, DISK TEMPERATURE ALERT, AIRFLOW OBSTRUCTION, CABINET VENTILATION, SERVER CABINET REQUIREMENTS, DDOS DISK TEMPERATURE, DISK COOLING, ENCLOSURE OVERHEATING, EVT-ENVIRONMENT-00055 
000185298 Data Domain: EVT-STORAGE-00003 | Disk Temperature Alerts on DS60 or ES40 EVT-STORAGE-00003 Event Message: The disk temperature is moderately high. DISK, TEMPERATURE, EVT-STORAGE-00003
000331892 Data Domain: Drive Firmware Update Issue on DDOS 7.13 | 8.1| 8.2 | 8.3.0.x On DDOS versions 7.13, 8.1, 8.2, 8.3.0.x Data Domains with drive firmware updates enabled may encounter unexpected, false disk failures on external storage.
DRIVE FIRMWARE UPDATE, REFERENCE COUNT, REFCNT ISSUE, DISK FAILURE, DEVICE GROUP DEGRADED, DDR PANIC, LINUX KERNEL 5.5, GENDISK STRUCTURE, SYSTEM PANIC, DEGRADED DISK GROUP

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Affected Products

Data Domain
Article Properties
Article Number: 000223815
Article Type: How To
Last Modified: 16 Dec 2025
Version:  6
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