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Elastic to Opensearch migration – Clear historic data before migration

Solved416 views13th January 2025Elasticsearch opensearch
5
Chris Glover [DevOps Advocate]1.13K 13th November 2024 1 Comment

Hi,

We planning to soon migrate our Elastic to a new Opensearch cluster. Our existing elastic has a lot of historic alarm data, going back three years. Is there a safe way to delete historic alarm data, say older than 6 months to reduce the size of the dataset?

Our current elastic snapshot is 118GB, and to perform the steps of restoring the snapshot onto Elastic 7.17 and then onto Opensearch, I'd like to reduce the size of the data as much as possible to make it easier to move the snapshot around.

Thanks

Chris

Chris Glover [DevOps Advocate] Selected answer as best 13th January 2025
Chris Glover [DevOps Advocate] commented 14th November 2024

Specifically, is it ok to delete the dms-suggest-alarms and dms-alarms indices?
I will delete these at the intermediate stage of the migration, (Elastc 7.17 stage) and not from the running system.

I'm assuming dataminer will recreate these indices as require, and won't complain about the data being gone from them

1 Answer

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Dave Keller [DevOps Enabler]1.60K Posted 18th November 2024 1 Comment

Hi Chris,

Does this DataMiner Docs page provide the answer you were looking for?

https://docs.dataminer.services/user-guide/Troubleshooting/Procedures/Manually_removing_old_alarms_from_ES.html

Chris Glover [DevOps Advocate] Selected answer as best 13th January 2025
Chris Glover [DevOps Advocate] commented 18th November 2024

Partially, yes. It doesn't answer if it's safe to delete the indexes entirely and if they'll be recreated

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