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Definitions and explanations to help you sort things out...
XaaS
The three flavors of X-as-a-Service are: Software-as-a-Service, Platform-as-a-Service, and Infrastructure-as-a-Service. SaaS is software that is deployed over the internet, available to the end user on demand, and typically paid for based on usage or through a subscription. CRM, E mail, and medical records software tools are examples of SaaS offerings. PaaS combines a development platform and a solution stack delivered on demand; providers deliver the hardware, OS, database, middleware, Web server, and other software allowing end users to develop solutions on top of the platform. Google's App Engine and Microsoft's Azure are examples. IaaS providers deliver the servers, software, data center, and network gear to subscribers - who then load applications, databases, websites, etc. on this outsourced computer infrastructure. Rackspace, Softlayer, Amazon EC2, and StrataScale are example IaaS providers.
RAID
The idea behind RAID, an acronym for Redundant Array of Independent Disks, is to increase storage functions and reliability through redundancy. The term RAID is used as an umbrella term for data storage schemes, and the schemes are named by "RAID" plus a number (RAID 1, RAID 10, RAID 5+0) to indicate increased data reliability or increased input/output performance.
Clone
To clone a server means to replicate the server's configuration to then bring up another similar server incredibly quickly and easily.
Snapshot
A means to backup your data on-demand is to make a point-in-time copy by taking a snapshot of your environment.
Failover
When a server environment goes down, failover is the switching of the failed environment over to a "hot" standby server. Autofailover is a feature whereby the switch happens automatically without human intervention.
SAN and NAS
Storage Area Network - SAN -is a high-speed subnetwork of storage devices architected in a way that makes storage available to all servers in the network. Because stored data does not reside directly on any of the network's servers, server power is utilized for business applications and network capacity is released to the end user. Sharing storage usually simplifies storage administration and adds flexibility since cables and storage devices do not have to be physically moved to shift storage from one server to another. Other benefits include the ability to allow servers to boot from the SAN itself - to quickly and easily get new, different, replacement servers up on-demand. With Network Accessed Storage - NAS - in contrast to SAN, it is clear that the storage is remote, and computers request a portion of an abstract file rather than a disk block. Potential benefits of NAS include faster data access, easier administration, and simple configuration.
SSL and SSL Acceleration
SSL (officially Secure Sockets Layer) is a protocol for communications security over the internet. SSL encrypts segments of network connections above the layered architecture of network components for privacy and message reliability. With SSL Acceleration, a hardware accelerator is employed to offload processor-intensive SSL transactions to make things more efficient and faster.
Load Balancing
Load balancing is a means to distribute workload across multiple servers to optimize resource utilization, maximize throughput, minimize response times, and avoid overloads.
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