# Restore from S3 to multiple ES clusters in parallel

**URL:** <https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250>\
**Category:** Elasticsearch\
**Created:** [January 5, 2021, 7:06pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250 "2021-01-05T19:06:43Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Norman\_Khine](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/norman_khine/32/3342_2.png) [@Norman\_Khine](https://discuss.elastic.co/u/Norman_Khine)\
**Post date:** [January 5, 2021, 7:06pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/1 "2021-01-05T19:06:43Z")

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Hello,  
Would there be any issues with restoring to multiple ES clusters from a single snapshot in parallel from an S3 backup?  
Will be looking to restore specific indexes into different clusters.  
Or should this be done sequentially?

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [January 5, 2021, 7:22pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/2 "2021-01-05T19:22:54Z")

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I doubt that would cause any problems, no. S3 almost certainly has more bandwidth than you do 🙂

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**Author:** ![ishanjain](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ishanjain/32/59637_2.png) [@ishanjain](https://discuss.elastic.co/u/ishanjain)\
**Post date:** [January 5, 2021, 7:34pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/3 "2021-01-05T19:34:02Z")

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Hey there!

We wanted more information in this issue because we don't know if ES mutates something in a snapshot while it's restoring it because if it does that, Restoring a snapshot to multiple clusters might cause some problems?

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [January 5, 2021, 7:36pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/4 "2021-01-05T19:36:42Z")

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No, because all (but one) of the clusters are using the repository in `readonly` mode. Quoting [the docs](https://www.elastic.co/guide/en/elasticsearch/reference/current/snapshots-register-repository.html#snapshots-register-repository):

> If you register the same snapshot repository with multiple clusters, only one cluster should have write access to the repository. All other clusters connected to that repository should set the repository to `readonly` mode.

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<div class="post-metadata">

**Author:** ![ishanjain](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ishanjain/32/59637_2.png) [@ishanjain](https://discuss.elastic.co/u/ishanjain)\
**Post date:** [January 5, 2021, 7:48pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/5 "2021-01-05T19:48:18Z")

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Thank you so much! 🙂

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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:** [February 2, 2021, 7:48pm UTC](https://discuss.elastic.co/t/restore-from-s3-to-multiple-es-clusters-in-parallel/260250/6 "2021-02-02T19:48:22Z")

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