# Multi DC clusters. version compatibility and upgrading

**URL:** https://forum.scylladb.com/t/multi-dc-clusters-version-compatibility-and-upgrading/5073
**Category:** ScyllaDB
**Tags:** administration, multi-dc, upgrade
**Created:** [August 20, 2025, 10:46am UTC](https://forum.scylladb.com/t/multi-dc-clusters-version-compatibility-and-upgrading/5073 "2025-08-20T10:46:18Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Guy](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/guy/32/9_2.png) [@Guy](https://forum.scylladb.com/u/Guy)
#### Post date: [August 20, 2025, 10:46am UTC](https://forum.scylladb.com/t/multi-dc-clusters-version-compatibility-and-upgrading/5073/1 "2025-08-20T10:46:18Z")

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> [@](#):
>
> **[Originally from the User Slack](https://slack.scylladb.com/)**
> 
> ![Yohan_Mok](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/e/ef0ee2f6948071edaf9b1b08d05511493f4b023d.png) **@Yohan_Mok:** Hi team,  
> We have a couple questions about multi DC clusters.
> 
> 1. Are there documents related to multi DC clusters where some DCs differ in version? Anything related to `inter-DC version compatibility` or `version upgrade for multi DC clusters` would be helpful.
> 2. We understand that upgrading a version in a single DC should respect each minor version(unless the docs say otherwise). Should multi DC clusters also conform to this rule?
> 
> ![dor](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/27b698a3e588f84cb82a722e458d31c997a48bed.jpeg) @dordor\*\*:\*\* Standard documentation is fine, it’s relatively easy to setup, you do need to read about the CL settings. It’s recommended to have the same version across DCs.
> 
> ![Yohan_Mok](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/e/ef0ee2f6948071edaf9b1b08d05511493f4b023d.png) **@Yohan_Mok:** We wanted to know if there were any documented limitations on version differences between DCs in the cluster.  
> (eg. DC of version X is compatible up to version Y?)
> 
> If this is documented like you say, is it ok if i ask for a link?
> 
> \> ps. cluster setup was not an issue + we are aware of CL settings and DCAwareRoundRobinPolicy
> 
> ![Felipe_Cardeneti_Mendes](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/233a9d524fbc97e39f08633c16b3dd2575d1d1f4.jpeg) @Felipe\_Cardeneti\_Mendes\*\*:\*\* @Yohan_Mok the general direction for single-DC applies. All nodes are part of a cluster irrespective of their placement. In other words: You can’t add a DC with a backleveled major version. As you upgrade one region, you should plan to also upgrade others.
> 
> ![Yohan_Mok](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/e/ef0ee2f6948071edaf9b1b08d05511493f4b023d.png) **@Yohan_Mok:** Thanks for the clarification!