# Performance during Snapshot Backups/Cross-Cluster replication

**URL:** <https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560>\
**Category:** Elasticsearch\
**Tags:** snapshot-and-restore\
**Created:** [February 15, 2023, 8:37am UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560 "2023-02-15T08:37:25Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![x00m](https://avatars.discourse-cdn.com/v4/letter/x/90db22/32.png) [@x00m](https://discuss.elastic.co/u/x00m)\
**Post date:** [February 15, 2023, 8:37am UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560/1 "2023-02-15T08:37:25Z")

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Assume the cumulative Index Size is approximately 200GB.

Is taking snapshot backup every 30 minutes advisable? Will it cause any performance impact on the cluster for any active read/writes happening to the cluster during the snapshot backup process?

Similarly, will the cross-cluster replication cause any performance degradation to the primary cluster's read/writes ??

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**Author:** ![BenB196](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/benb196/32/83401_2.png) [@BenB196](https://discuss.elastic.co/u/BenB196)\
**Post date:** [February 15, 2023, 1:04pm UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560/2 "2023-02-15T13:04:00Z")

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When you say:

> Assume the cumulative Index Size is approximately 200GB.

Do you mean that the total amount of data in the cluster will be 200GB, or that within the 30-minute window 200GB of data will change requiring a new backup?

Either way, generally speaking, the backup/snapshot process is fairly efficient on newer versions of Elasticsearch, as long as you have a good (fast) network connection to the backup destination, backups generally shouldn't cause many issues related to performance.

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**Author:** ![x00m](https://avatars.discourse-cdn.com/v4/letter/x/90db22/32.png) [@x00m](https://discuss.elastic.co/u/x00m)\
**Post date:** [February 16, 2023, 1:11pm UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560/3 "2023-02-16T13:11:56Z")

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The total amount of data in the cluster say is 200 GB.  
Within the 30-minute timeframe, assume a data of about 10-15 GB is ingested.

When I configure the snapshots to be taken/backed up to remote repository every 30 minutes, how significant would the impact on the performance of read/writes be during the snapshot backup process? I assume it's a separate single thread running that transports the backup, so I believe it shouldn't really affect the usual read/writes.

(Running on a 2vCPU and 8GiG of ram per node on a 3 node cluster.)

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<div class="post-metadata">

**Author:** ![BenB196](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/benb196/32/83401_2.png) [@BenB196](https://discuss.elastic.co/u/BenB196)\
**Post date:** [February 16, 2023, 1:15pm UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560/4 "2023-02-16T13:15:59Z")

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I unfortunately can't really say. I would not expect much of a performance impact, but the only way to know for sure is to actually test it and see what happens.

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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 16, 2023, 1:16pm UTC](https://discuss.elastic.co/t/performance-during-snapshot-backups-cross-cluster-replication/325560/5 "2023-03-16T13:16:50Z")

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