• Memory / Persistent Storage ratio is usually much lower for databases on spinning disks. If the ratio of data to RAM is too large then you can reduce the memory required to keep performance critical data in RAM. Suggestions:
• Spinning disks usually provide much lower random read throughput than flash.
• Throughput gap between random read vs. sequential read is much higher in spinning disks. Suggestions:
• Spinning disks are much larger than flash: