Data Domain: DD3300 Displays Unknown Disks Without Alerts

Summary: On Data Domain DD3300 appliances, you may notice one or more disks reported as unknown when running disk state commands, even though no alerts are posted. This behavior is expected and explained in this article. ...

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Symptoms

Unknown disk(s) displayed in CLI output without any active alerts
 
Example output from # disk show state: 
Disk Show State
-----------------
Dev     1  2  3  4  5  6  7  8
---     ------------------------
1-8     Y  Y  U  U  .  .  .  .
---     ------------------------
Legend   State           Count
------   --------------  -----
.        In Use Device   4
U        Unknown Device  2
Y        System Device   2
------   --------------  -----
Total 0 disks and 8 devs

Cause

DD3300 appliances reserve certain disks for Cloud Tier functionality. If Cloud Tier is not activated, these reserved disks are shown as unknown in the system state.

The number or devices reserved depends on the DD3300 configuration. As below:
kA23a0000000AUiCAM_1_0

Resolution

  • This is normal system behavior.
  • The unknown disks are reserved for Cloud Tier and remain in this state until Cloud Tier is enabled.
  • No action is required unless Cloud Tier activation is planned.

Affected Products

Data Domain, DD3300 Appliance

Products

Data Domain, Data Domain Deduplication Storage Systems
Article Properties
Article Number: 000060053
Article Type: Solution
Last Modified: 16 Dec 2025
Version:  4
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