# How does Cluster synchronisation works?

**URL:** <https://discuss.elastic.co/t/how-does-cluster-synchronisation-works/95337>\
**Category:** Elasticsearch\
**Created:** [August 1, 2017, 12:21pm UTC](https://discuss.elastic.co/t/how-does-cluster-synchronisation-works/95337 "2017-08-01T12:21:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![freddy](https://avatars.discourse-cdn.com/v4/letter/f/3d9bf3/32.png) [@freddy](https://discuss.elastic.co/u/freddy)\
**Post date:** [August 1, 2017, 12:21pm UTC](https://discuss.elastic.co/t/how-does-cluster-synchronisation-works/95337/1 "2017-08-01T12:21:17Z")

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Hello everyone,  
I wonder how the synchronisation between two clusters works. my two servers have the same cluster name and node name, so synchronisation wokrs fine. I have to use elasticsearch version 1.7.6 for a project, so i cannot update (just as an information if something has changed how it works). I'd like to know what happens if a project with the same name but different data is on these two servers. Or how do I know that the synchronisation is finished and in progress?

Thank you  
Freddy

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 29, 2017, 12:21pm UTC](https://discuss.elastic.co/t/how-does-cluster-synchronisation-works/95337/2 "2017-08-29T12:21:36Z")

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Closed on August 29, 2017, 12:21pm UTC

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