In most cases, our recommendation is to use an SSD drive for Xray to have better performance and it is not recommended to use an NFS drive, as it is a disk I/O-intensive service, a slow NFS server can suffer from I/O bottlenecks and NFS is mostly used for storage replication.
Xray stores node-specific files, such as configuration and temporary files, to the disk. These files are exclusively used by Xray and not shared with other services. Since the local storage used for Xray services is temporary, it does not require replication between the different nodes in a multi-node/HA deployment.