We are running a 3 node cluster (Elasticsearch 8.8.2) running on 3 identical physical machines. Each machine has 2 onboard SSD storage devices. As of now, only one of the two SSDs is in use. It has the OS(Ubuntu) and Elasticsearch installed.
The second SSD is not partitioned, it is unused. Is there any way we could extended the storage the other SSD?
Further, is there any way we would attach external storage via USB and store older indices on it (Warm Tier)?