# ElasticSearch sync two clusters

**URL:** <https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570>\
**Category:** Elasticsearch\
**Created:** [February 10, 2020, 11:13am UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570 "2020-02-10T11:13:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![kojo](https://avatars.discourse-cdn.com/v4/letter/k/a88e57/32.png) [@kojo](https://discuss.elastic.co/u/kojo)\
**Post date:** [February 10, 2020, 11:13am UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570/1 "2020-02-10T11:13:32Z")

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Hi all,  
If anybody could help me i would be very grateful. Problem i have is next:  
I have one cluster with 5 instances that's operational. It has over 10 TB of data and it creates snapshot every day. I created second cluster that's main purpose is disaster recovery. I managed to restore snapshot from original cluster without any problems. When i try to restore new snapshot on replica cluster it starts restoring from beginning and that takes a lot of time (aprox. 10 hours).  
Original cluster is creating snapshot to s3 bucket, and replica is restoring from the same bucket. Replica has read-only rights on that bucket. Replica doesn't create snapshot.  
Is there any way to have those two clusters in sync without big downtime on replica cluster?

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**Author:** ![ywelsch](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ywelsch/32/7751_2.png) [@ywelsch](https://discuss.elastic.co/u/ywelsch)\
**Post date:** [February 10, 2020, 1:14pm UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570/2 "2020-02-10T13:14:35Z")

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yes, see [cross-cluster replication](https://www.elastic.co/guide/en/elasticsearch/reference/current/xpack-ccr.html)

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**Author:** ![kojo](https://avatars.discourse-cdn.com/v4/letter/k/a88e57/32.png) [@kojo](https://discuss.elastic.co/u/kojo)\
**Post date:** [February 11, 2020, 8:30am UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570/3 "2020-02-11T08:30:04Z")

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I saw this, and the only reason i haven't tried it is because the replica cluster version is 7.5 and the old one is 6.3. In prerequisites table says it's not compatible. Is there maybe a workaround?

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**Author:** ![ywelsch](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ywelsch/32/7751_2.png) [@ywelsch](https://discuss.elastic.co/u/ywelsch)\
**Post date:** [February 12, 2020, 3:23pm UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570/4 "2020-02-12T15:23:59Z")

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I'm not aware of any workaround. Ideally you should upgrade the 6.3 cluster to 6.8 (which contains many bug fixes).

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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:** [March 11, 2020, 3:24pm UTC](https://discuss.elastic.co/t/elasticsearch-sync-two-clusters/218570/5 "2020-03-11T15:24:00Z")

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