DD OS

This document highlights minimum, recommended, and latest code versions for Dell Technologies Enterprise and Data Center Infrastructure products. Dell carefully evaluates and monitors code deployment data to ensure that product releases meet our stringent expectations to provide our customers with reliable products and solutions.

This document highlights minimum, recommended, and latest code versions for Dell Technologies Enterprise and Data Center Infrastructure products. Dell carefully evaluates and monitors code deployment data to ensure that product releases meet our stringent expectations to provide our customers with reliable products and solutions.

This article outlines how to fix the issue and reenable the file system when the Data Domain File System (DDFS) panics with the following PANIC string: PANIC: ddr/dm/dmbt_iface.c: dmbt_update_entry_nolock

Excessive SNMP polling can overwhelm the Data Domain System Management Service (SMS), causing filesystem-related commands to fail with messages such as "The filesystem is unavailable at this time" or "filesys not responding." In severe cases, SMS resource contention may lead to skipped cleaning cycles, capacity growth, backup or replication impacts, and management application discovery failures.

In Data Domain HA environments, network connectivity alerts (EVT-NETM-00001) for RDMA interfaces may automatically clear on the active node even when the physical link has not been restored. This occurs because the RDMA recovery mechanism can temporarily change interface states, causing netmon to interpret the condition as resolved and clear the alert prematurely.

This knowledge base article explains what happens when an unexpected file system Data Domain File System (DDFS) restart occurs, the potential alerts encountered and what information to capture for triage purposes.

DD Boost users may remain undeletable after their associated storage units are removed, particularly when storage units were automatically created by PowerProtect Data Manager (PPDM). Running a file system clean operation, followed by DD Boost user unassignment and user deletion, removes the stale references and allows the user accounts to be deleted successfully.

Data Domain HA status reports degraded with SMS mirroring failure due to an iDRAC stability issue that returns HTTP 500 when enumerating users.

NetWorker space reclamation from Data Domain may not proceed due to connectivity issues, even after media database records for the files are removed.

This KB is intended for Dell Partners and NetWorker support. This KB details a troubleshooting approach and does not provide a solution for any specific failure.

DataDomain Alerts relating to the Filesystem do not generate Emails from the DDMC

Backup jobs using DD Boost may fail with a "Maximum number of opened connections cannot exceed 60" error when the backup application reaches a supported backup chain or restore point limitation. This condition is generally related to backup software design constraints and retention configuration rather than a Data Domain system issue.

Data Domain systems upgraded to DDOS 8.3.1.40 and DDOS 8.6.1.20 stop reporting to DDMC 8.5.0.0 or DDMC 8.6.0.0.

A BoostFS-mounted drive on Windows may appear as "Disconnected" in Windows Explorer or generate connectivity-related errors even though BoostFS authentication, mounting, DDBoost communication, and backup operations are functioning normally. In these cases, investigation may determine that the behavior originates from the Windows client operating system or endpoint security software rather than Data Domain or BoostFS.

This article provides guidance for troubleshooting common BoostFS issues, including connectivity, mount failures, lockbox problems, performance concerns, and compatibility validation. It also outlines recommended checks, log collection locations, and information to gather when investigating BoostFS-related issues.

A user was unable to write to a BoostFS-mounted storage unit after directory ownership was changed from a user-owned group to a shared operations group. Investigation confirmed the behavior is expected because BoostFS authorization checks rely on the user's primary group, unlike some NFS configurations where mount-point permissions may allow broader write access.

This guide explains what Dial Home is on Data Domain systems, what data it sends to Dell, and how each connection method and report type works. Expectations are set for how these automated reports speed issue detection, simplify support, and improve system‑health visibility.

Data Domain claims to need a replication license for a local copy operation which has never historically required one.

Token-based authentication in DD Boost OST Plug-in 8.4 provides a more reliable authentication method and helps avoid intermittent credential decryption issues seen with earlier authentication handling in some NetBackup 10.x environments. It also improves credential security by eliminating dependence on encrypted password decryption workflows.

Clear entries by removing PostgreSQL DB and reinstalling Avamar REST API rpm package.Troubleshoot backup failure by checking software version and client properties on NMC1.

DD CIFS becomes inaccessible when DNS is configured but not working.

A BoostFS lockbox may become corrupted after Windows patch installation and a subsequent system reboot, causing BoostFS mount and lockbox query operations to fail. Recreating the lockbox temporarily restores functionality, but the issue can reoccur unless Windows patching and reboot activities are completed before BoostFS installation.

A NetBackup LSU (Logical Storage Unit) or Disk Volume configured through the Data Domain OST plugin may be marked offline when a single DDBoost storage unit has more than five associations configured in the same replication direction. This limitation can cause backup, replication, and disk polling operations to fail, resulting in the associated Disk Volume and Disk Pool being reported as down.

Auto Image Replication (AIR) imports were intermittently missing because multiple NetBackup domains were configured to access the same Data Domain storage units using shared DDBoost credentials. This created an event-stealing race condition where unintended media servers consumed AIR event files, resulting in inconsistent imports and failed restores during disaster recovery testing.

A Data Domain system generated excessive Priority Flow Control (PFC) packets during Avamar swing node replication activities, causing connected Cisco Nexus switches to automatically disable network interfaces. The issue was traced to Intel NIC firmware-level LLDP behavior affecting DCBx communications and was resolved by upgrading to DDOS 8.4 or later.

When a DDOS upgrade is performed on version 8.7 or earlier, the RPM signature check may fail with the error message: "RPM ".rpm file" signature is invalid."

NetWorker: Clone fails with Err: 5009-nfs filecopy stop failed (nfs: I/O error) after Data Domain upgrade to DDOS 8.7 or 8.8

This article explains the process for using a new encryption key.

After upgrading to DDOS 8.6, a Data Domain appliance may be unable to configure or reconfigure a network interface. Affected interfaces may display the FEC value as N/A, and configuration attempts may fail with the error "Failed to set link parameters".

The /ddvar (also known as /ddr/var) filesystem is the primary location that DDOS uses to store logs. This knowledge base article describes the common causes and steps to take to help alleviate or free up space inside /ddvar