Storage utilization - indices spread across multiple storage devices attached to the same node


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)?

You can either run a second node on each machine targeting the other disk, or you can use something like LVM to stretch a single filesystem across both disks.

Same answer, but more likely that you want distinct nodes for this storage.

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