I am running ES on a Synology NAS VM.
My data and indexes are also stored on the same NAS (same volume).
Bays in the NAS may be allocated to filesystem cache.
"Elasticsearch heavily relies on the filesystem cache in order to make search fast"
Is there a way to calculate an optimum size for the SSDs or is there a maximum size beyond which the value decreases or do I install the largest SSDs I can afford?