Cassandra Cluster migration

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Hi,

Currently we're running on 10.1.0 CU11, with current server loads preventing us from going to 10.2 or above.

Can the Cassandra Cluster Migrator tool from a newer version of DataMiner be used to migrate the data from an older version of DataMiner?

We do intend to upgrade after we've freed up resources on the servers once we've removed the local Cassandra install.

Arunkrishna Shreeder [SLC] [DevOps Enabler] Answered question 6th June 2023

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Hi Philip,

A lot of issues with respect to Cassandra cluster migration were fixed in DataMiner 10.2, that is why as per Migrating the general database to a DMS Cassandra cluster | DataMiner Docs, it is mentioned to run the Cassandra cluster migrator tool with DMAs running at least 10.2.

Arunkrishna Shreeder [SLC] [DevOps Enabler] Posted new comment 7th June 2023
Jeroen Geldhof [SLC] [DevOps Enabler] commented

I would even suggest upgrading to 10.3.

There are still some known issues in 10.2 and 10.3 regarding Cassandra Cluster.
These are documented here:
https://docs.dataminer.services/user-guide/Troubleshooting/Known_issues/Known_issues.html
Philip Argent commented

We have had to downgrade to 10.1, as NATs kept causing one of our servers to crash, as the DM processes lost connection with the service, needing a full DMA reboot.
This is why I’m reluctant to upgrade to a newer version before taking some load off the DMAs, and wanted to know if the migration tool could be used from 10.3 while still running 10.1
Arunkrishna Shreeder [SLC] [DevOps Enabler] commented

Hi Philip,
I checked internally and it is not possible to use the migrator tool from 10.3 while running 10.1.
However, we can try to manually configure NATS and then proceed with the upgrade
Philip Argent commented

Thanks, I’ll engage with our squad when we get to that part.