The private server concept has finally come of age, and has the potential to fill the gap between economy shared hosting and big budget dedicated hosting. The concept is not a new one. The notion of dividing the resources of a physical server has been around for many years. Mainframes were once divided to allow more people affordable access to these large and very expensive devices.
It is more than a shared server and less than a dedicated server. Think of it as a multi-tenant dwelling or luxury condo. There are a several companies that offer this product, such as Sphera, Ensim, and an open source project called FreeBSD. While Ensim and Sphera do not actually host anything themselves, they license their technology to many hosting companies around the world.
Ensim Instant Server Technology allows a hosting provider to slice up a physical server into virtual or "private," systems. Each private server has it's own unique file system, disk space, user space (including virtual root), process space, CPU, bandwidth, and memory allocations:
Performance Isolation: Heavy traffic or CPU load has no affect on other private servers on the same box, but there are limits on CPU, Memory, and Process.
Functional Isolation: A VPS does not share applications or services with other private servers, nor do they share the same file system. Private Servers are invisible to each other and do not share processes.
Fault tolerance: Errors or faults in one private server do not affect others.
IP Addresses: Each private server has it's own set of IP addresses and network stack.
Root access to individual private servers: This allows you to run your own applications and fully manage your private server as you would on a dedicated server.
Guaranteed QOS/SLA: Memory, CPU, bandwidth, disk space, and up time.
Enhanced Security: Private servers do not share disk space, TCP/IP stacks or processes.
Why do you need it?
Control: So they can install and run their own applications
Security: To ensure that they will never have to share the same space with other customers
Performance: Their site is growing and needs more resources.
All of these are valid reasons to graduate to a dedicated hosting account. What I've found however, is that most of these sites only utilize a very small portion of the dedicated machine: as little as 5 percent or less, which is where a VPS comes in. As we talked about earlier the private server gives you all the benefits of a dedicated server, but now you can share a physical server and still have the same guarantees of a dedicated server: for a fraction of the cost.
You get a set of QOS/SLA values that can expand as you grow. Any of these values can be increased on the fly, and activated with a simple reboot of the private server.
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