Data scalability is the ability of a system to store, manipulate, analyze, and otherwise process ever increasing amounts of
data without reducing overall system availability, performance, or throughput.
Domain Name System is a replacement for a centralized ‘hostname to numerical address database’ (in reality it was a simple text le) that was used in the days of ARPANET, the precursor to what is known today as the Internet.It is much easier to remember ‘google.com’ instead of ‘188.8.131.52’.
Eventual consistency - when a write is successful, stale data may still be read but will eventually return the latest value.
Idempotence is the property of certain operations in mathematics and computer science, that can be applied multiple times without changing the result beyond the initial application.
Immediate consistency - when a write is successful, subsequent reads are guaranteed to return that latest value.
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc. KVM is open source software.
Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged in order to accommodate that growth.