Classical shared hosting solutions using CPanel and Parallels Plesk:

• Cannot tolerate the failure of a single server, unless used in conjunction with a shared storage and virtualisation solution, which then becomes expensive and hard to manage.
• Cannot tolerate the failure of a region or datacenter and hard to integrate and manage a DR site if one is used.
• No tools to allow instant rollback - if a customer or sysadmin makes a mistake then typically it’s a restore from an hourly or daily backup with significant operational costs.
• No automatic data replication between machines - typically a shared NAS is used which, if it fails, can be catastrophic.

Virtualised solutions such as OnApp and VMware:

• Reliant on physically shared storage, typically a SAN, which is extremely expensive compared to HybridCluster and requires specialist operations to manage and maintain.
• Hypervisor based Virtualisation burns memory on each machine because RAM is allocated to each kernel and OS instance running. HybridCluster uses OS virtualisation to virtualise the key user space processes. This uses far less RAM - with HybridCluster density can increase by 400%. There is also less I/O overhead than booting many virtual machines, which is a critical resource for hosting systems.