DataDomain: DD3300 unknown disk with no alerts.
Summary: An unknown disk or multiple unknown disks present at the DD3300 model. The system is not showing alerts.
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This article is not tied to any specific product.
Not all product versions are identified in this article.
Symptoms
An unknown disk or multiple unknown disks present at the DD3300 model - with no alerts posted
When running the command "#disk show state" the DD3300 system presents unknown disk/s. For example:
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 have some disks reserved for the Cloud Tier. If the Cloud Tier is not activated the disk will be showed as "unknown".
The 1TB disk reserved for Cloud Tier can not be added to the Active Tier:
The number or devices reserved depends on the DD3300 configuration. Please see the image below:
Source: PowerProtect DD3300 Hardware Overview and Installation Guide
Resolution
The 'unknown' disk device is designated for use in the Cloud Tier.
As Cloud Tier is disabled the disk is showed as unknown disk.
The system is working as designed.
As Cloud Tier is disabled the disk is showed as unknown disk.
The system is working as designed.
Affected Products
Data DomainProducts
Data Domain, DD3300 Appliance, Data Domain Deduplication Storage SystemsArticle Properties
Article Number: 000060053
Article Type: Solution
Last Modified: 08 Jul 2025
Version: 3
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