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Both CoRAID and Scality are selling hardware with their proprietary software on top. They aren't Software-Defined Storage. |
added another Hypervisor as example |
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===Server vs. storage hypervisor===
An analogy can be drawn between the concept of a server hypervisor and the concept of a storage hypervisor. By virtualizing servers, server hypervisors ([[VMware ESX]], [[Microsoft Hyper-V]], Citrix Hypervisor, [[Linux KVM]], [[Xen]],[[z/VM]]) increased the utilization rates for server resources, and provided management flexibility by de-coupling servers from hardware. This led to cost savings in server infrastructure since fewer physical servers were needed to handle the same workload, and provided flexibility in administrative operations like backup, failover and disaster recovery.
A storage hypervisor does for storage resources what the server hypervisor did for server resources. A storage hypervisor changes how the server hypervisor handles storage I/O to get more performance out of existing storage resources, and increases efficiency in storage capacity consumption, storage provisioning and snapshot/clone technology. A storage hypervisor, like a server hypervisor, increases performance and management flexibility for improved resource utilization.
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