Comment by agavra

The other solution is to aggressively size your disk cache and keep effectively the full working set on disk, using object storage just as a durability layer. Then the main benefit is operational simplicity because you have a true shared-nothing architecture between the read replicas (there's no quorum or hash ring to maintain and no deduplication on read). Obviously you'll have a more expensive deployment topology if you do so, but it's still compelling IMO because you have the knobs to tune whether you want to cache on disk or not.