As you probably already know, IOPS means Input/Output Per Second (IOPS). So, it is a performance measurement used to characterize computer storage devices like hard disk drives (HDD) and solid state drives (SSD). Basically, IOPS is still the most common metric in order to measure the overall performance of storage systems.
Lately, Hostens thought about its clients so much and found a solution how to increase IOPS for the better storage performance:
KVM Small 400 IOPS
KVM Medium 800 IOPS
KVM Large 1600 IOPS