Data Domain

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This article describes the cause of and resolution for the alert "EVT-STORAGE-00025: Current cache tier size is less than what the system is licensed for".

This article helps with troubleshooting possible cable connection issues on SAS links to attached storage shelves and enclosures.

Data Domain generates Serial Attached SCSI (SAS) or Multipath (MPATH) alerts when a link fails; missing connections, loss of redundancy, caused by incorrect or loose cabling or hardware faults.

This article provides an understanding of the Data Domain Disk Reconstruction process.

Unable to create DD device with DD Retention Lock enabled due to expired Management certificate in NSR Data Domain resource file.

On DD3300 and DP4400, disks flagged by the PowerEdge RAID Controller or iDRAC generate EVT‑STORAGE‑00031 (hardware fault) or EVT‑STORAGE‑00032 (recoverable predictive failure) alerts.

Disks may show “Unknown” when a new drive isn’t recognized, a failed or unreliable drive reports unknown, a newly added enclosure isn’t integrated, or a replacement disk isn’t initialized.

This article outlines the steps required to resolve a disk that is in an absent state on a Dell Data Domain system.

This article explains the cause of the autosupport alert indicating that a disk has triggered continuous discovery, resulting in the enclosure slot being disabled. It also provides the required steps to replace the drive and reenable the slot.

Summary: This document provides actions that Tech Support would complete when performing a general health check on a Data Domain (DD) System. It includes general commands and outputs to help identify alerts or misconfigurations.

Descriptions of the various states that a disk drive on a Data Domain system can be in, and the significance of the state.

This article explains why disks appear in a Foreign state on Data Domain systems and provides the required steps to resolve the condition without risking data loss.

This article explains why a disk may appear in a "known" state on a Data Domain system and provides steps to diagnose and resolve the condition.

Because NFS clients are increasingly using NFSv4.x as the default NFS protocol level, protection systems can now employ NFSv4 instead of requiring the client to work in a backwards-compatibility mode. Clients can work in mixed environments in which NFSv4 and NFSv3 must be able to access the same NFS exports. The DDOS NFS server can be configured to support NFSv4 and NFSv3, depending on-site requirements. You can make each NFS export available to only NFSv4 clients, only NFSv3 clients, or both.

This article discusses a "net set up flag failure when an interface is enabled.

With the introduction of Data Domain File System (DDFS) support for NTFS Access Control Lists (ACLs), it is necessary to use the Windows method for changing file and directory ownership and permissions.

Following a DDOS upgrade some systems might report a firmware mismatch.

Summary: DDOS precheck fails because of an old certificate in the trust chain.

When 'MTree "/data/col1/<name>" already exists' appears on Data Domain (DD), the mtree was previously deleted but cleaning has not run.

Too many connections error is the result of lots of connections being created and opened but never closed and terminated. This is causing the active connections count to increase until 256 which is the maximum limit of active connections. The new connections being opened later are failing with too many connections error.

Cloning failed for all VMware save sets, when Retention Lock (RL)is enabled on mtree. System and Database cloning is successful, only VMware save sets are affected. VMware cloning works successfully, and fails immediately when RL is enabled. No other changes are done.

This article contains limitations and recommendations for Data Domain with regard to Veeam 12 backup and replication user guide and other documents.

This article discusses how to use tThe Realtime Charts panel which displays up to seven charts that show real-time subsystem performance statistics, such as CPU usage and disk traffic.

This article explains how to disable the SNMP Agent in iDRAC for DD3300, DD6400, DD6900, DD9400, and DD9900 systems.

NetWorker fails to mount ddboost device with error 5044 read-only file system.

This document serves to help with identifying the error or and fault and provide a resolution path.

The Cyber Recovery software enables and disables the replication Ethernet interface and the replication context on the Data Domain in the Cyber Recovery environment.

For environments that are not using a VPN for secure connections between sites, Data Domain Replicator software can securely encapsulate its replication payload over SSL with AES 256-bit encryption for secure transmission. This process is also known as encrypting data in flight. You can encrypt the data replication stream by enabling the Data Domain Boost file replication encryption option.

Commvault backups stall with errors 'Cannot set file access time' and 'Cannot mark file' when Data Domain retention lock is enabled.