I/O makes or breaks the system, so storage performance is always a big deal, especially in virtualized environments, where VMs are hungry for IOPS. It’s extremely expensive to implement an all-Flash, even more so – all-RAM storage, both considered to be overkill. Thus, a combination of slower spindle, faster Flash and much faster RAM tiers is typically used in the industry.
StarWind Virtual SAN eliminates the single point of failure for storage in virtualized infrastructure by using duplication and triplication of data, caches and I/O controllers, basically “mirroring” them all between independent physically different hosts. This way, the virtual shared storage becomes fault-tolerant and provides high availability to higher performance and low-cost.