Symptoms

Alert | Symptom code: Event Codes: STORAGE-00001, STORAGE-00002, PHYM-00001Alert Messages: Enclosure disk has failed and should be replacedDisk has a hardware fault and may need to be replacedDisk is absent and should be replacedUnable to access the disk; disk state is powered offA disk has failed, and the enclosure slot has been disabled Affected Products: All Data Domain systemsAll Data Domain Operating System (DDOS) software releases

Cause

DDOS continuously monitors disk health and automatically fails a drive when critical I/O errors occur. Alerts are generated when a disk is: Removed (absent)Dead or failedPowered off (manually or automatically by DDOS to prevent backend issues)

Resolution

Verify and confirm the failure: Verify the alerts on the system using DDMC, Data Domain System Manager (DDSM) Web UI, or DD-CLI (SSH). DD-CLI # alerts show currentDDSM > Alerts Identify and confirm the current state of all drives in the system. DD-CLI # disk show state | AND | # disk show hardwareDDSM > Hardware > Storage > Disks Disk state indicators: F = FailedR = ReconstructingS = SpareA = AbsentP = Powered-off Example: DD-CLI:# disk show state sysadmin@DD# disk show state Enclosure Disk 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 --------- ---------------------------------------------- 1 . . . 2 . . . . . . . . . . . . . . s 3 . . . . . . . . . . . . . . s 4 . . . . . F . . . . . . . . R --------- ---------------------------------------------- Here notice that disk 4.6 (F)ailed - (R)econstructing to Spare disk 4.15. For DD3300 disk issues, consider this article Data Domain: DD3300 Mapping disk alerts to the correct hard drive slot Raise a Service Request (SR) Replace single failed disks as soon as possible.If an SR was not automatically generated over dial home: Contact your support provider and raise an SR. If multiple disk failures are present: Contact Dell ProSupport (or your contracted Service Provider) immediately for guidance. Monitor the System While Waiting for Replacement Disk. After raising an SR, continue monitoring to ensure system stability. 3.1 Understand why backups continue. Data Domain systems use RAID 6 (double parity).The system protects data during disk failure.DDOS reconstructs data automatically onto an available spare.Backup and restore operations continue during reconstruction. 3.2 Verify reconstruction status. Run: disk show state Confirm a disk shows (R)econstructing. 3.3 Monitor reconstruction progress Re-run disk show state periodically.Reconstruction time depends on disk size and system load. 3.4 Watch for additional disk failures. ⚠️ Critical WarningRAID 6 tolerates two disk failures per disk group.A second failure during reconstruction increases the risk. If another disk failure occurs: Contact Dell ProSupport (or your contracted Service Provider) immediately. 3.5 Identify the physical disk Disk format: Enclosure.Slot (example: 2.27)In DDSM: Navigate to Hardware > Storage > DisksSelect disk → click Beacon to enable LED In DD-CLI: # disk beacon n.n 3.6 Do not remove the failed disk. Leave the failed disk installed until the replacement arrives.Early removal provides no benefit and may complicate tracking. Replace the failed disk: Follow the official disk replacement procedures in Data Domain Documentation Best Practice: Wait 2 minutes between removal and insertion: Remove failed diskWait 2 minutesInsert replacement disk This allows the controller to properly unregister the old disk and prevents hot-plug recognition issues. Verify Post-Replacement Status: From DD-CLI # disk show state DDSM > Hardware > Storage > Disks Example: DD-CLI: sysadmin@DD# disk show state Enclosure Disk 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 --------- ---------------------------------------------- 1 . . . 2 . . . . . . . . . . . . . . s 3 . . . . . . . . . . . . . . s 4 . . . . . s . . . . . . . . . --------- ---------------------------------------------- The replacement disk becomes Spare, and the reconstructed disk returns to active use. Troubleshoot Replacement Issues. If the new disk shows as Unknown: Run command # disk rescanVerify status of disk from DD-CLI # disk show state If the new disk reports as failed Run command # disk rescanVerify status of drive from DD-CLI # disk show stateIf still (F)ailed, run this command from DD-CLI: # disk unfail <encl.disc> For example: # disk unfail 5.6 If the disk status is confirmed OK (In-use or Spare), clear any related alerts: From DD-CLI # alerts clear alert-id <alert-id>

Support Cases