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DataMiner System Errors Due to Cassandra Data Loss

Solved86 views23rd June 2025Cassandra Failover
1
Curtis Baiden [DevOps Advocate]560 19th June 2025 0 Comments

Cassandra was mistakenly deleted, and now elements on our DataMiner system are in error. Our setup is a 1+1 configuration with one Cassandra server and one Elasticsearch server. Although we've reinstalled Cassandra, the data loss has caused all elements on the failover server of the DMS to be in error.

Additionally, there's a critical authenticator alarm, and the main DMA is in a better state compared to the failover server.

Has anyone experienced a similar issue or can provide guidance on how to resolve this?

Curtis Baiden [DevOps Advocate] Selected answer as best 23rd June 2025

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Ciprian Moga [SLC] [DevOps Member]461 Posted 20th June 2025 1 Comment

Hi Curtis,

Thanks for sharing the details; this definitely sounds like a challenging situation.

With Failover enabled, the Cassandra nodes on both agents (main and backup) are configured to remain in sync to support seamless switching in the event of a fault. Reinstalling one of the nodes likely disrupted this synchronization, preventing the two nodes from meeting the conditions required for a successful failover. This would explain the element startup errors you’re encountering after switching to the failover agent.

Just to clarify - was only one of the Cassandra nodes reinstalled, or were both? And do you happen to have a recent full backup of your DataMiner system? Depending on what data is still intact (and if restoration is a viable option), there may be a way to recover functionality without complete data loss.

Given the complexity of the issue and the potential risk of further impact, I’d strongly recommend reaching out to your account manager and our technical support team (Contacting DataMiner Support | DataMiner Docs). They can evaluate the current state of your system and provide guidance to get everything back on track.

Let me know if this information is helpful or if you have any further questions.

Curtis Baiden [DevOps Advocate] Posted new comment 23rd June 2025
Curtis Baiden [DevOps Advocate] commented 23rd June 2025

Thanks for your response. I have reached out for further assistance now.

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