HI @Tram Nguyen​ ,

I am not sure if I got this correctly but I believe you are referring to the:

• Root storage for a workspace: Root storage for workspace objects like cluster logs, notebook revisions, and job results libraries (https://docs.databricks.com/administration-guide/account-api/aws-storage.html#configure-aws-storage)
• Metastore storage: Each metastore is configured with a root storage location in an S3 bucket in your AWS account. This storage location is used for metadata and managed tables data.(https://docs.databricks.com/data-governance/unity-catalog/index.html#metastores)

It's not recommended to re-use the workspace s3 bucket for metastore.

thanks,

Pat.