Contents of Elements folder deleted from offline Agents in Failover cluster

Affected versions

All Failover systems.

Cause

On offline Agents in a Failover cluster, an unexpected deletion of element content can occur. This issue is only triggered under a specific set of conditions:

1. A naming conflict in the cluster leads to the creation of an entry containing only <INVALID NAME> in the DVE element info in the database.

2. The DVE parent element associated with that <INVALID NAME> entry is removed or migrated.

   Note

   The issue may also occur if the DVE parent element no longer generates DVEs, but has generated DVEs in the past.

3. On offline Agents, this may result in all contents of the C:\Skyline DataMiner\Elements folder being deleted, instead of only the intended DVEs.

Note

• This issue is more likely to occur if the noElementPrefix option is used, as this removes the parent element name from DVE names and increases the chance of name conflicts.
• Entries in the database like <INVALID NAME> element name (i.e. also containing the element name in addition to <INVALID NAME>) do not trigger this issue.

Fix

Install DataMiner 10.5.0 [CU10]/10.6.1.

Workaround

1. Locate the element info:

   • Look for a zipped folder named "Element   deleted" in the C:\Skyline DataMiner\Recycle Bin folder, or

   • Copy the element files from the online DMA.

2. Copy the elements to the C:\Skyline DataMiner\Elements folder of the offline DMA.

3. Restart the DMA.

Description

In Failover clusters, the C:\Skyline DataMiner\Elements folder on offline Agents may be unexpectedly cleared, sometimes leaving no elements behind. This can happen in rare cases where specific conditions related to DVE element handling and naming conflicts are met.

To detect whether this has occurred:

• Compare the number of elements on the online and offline Agents.

• Check the offline Agent’s Recycle Bin for entries named "Element   deleted", indicating a deletion occurred without a known element name.