What is RAID?

 RAID is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the required level of redundancy and performance. The different schemes, or data distribution layouts, are named by the word "RAID" followed by a number, for example RAID 0 or RAID 1. Each scheme, or RAID level, provides a different balance among the key goals: reliability, availability, performance, and capacity. RAID levels greater than RAID 0 provide protection against unrecoverable sector read errors, as well as against failures of whole physical drives.
The different modes (mirroring, striping and parity) are used to define the different RAID levels. Processing is required to carry out those actions, and that can take place on the host server's OS or in the storage array or controller which also called software RAID or hardware RAID.
So, what are the pros and cons of software RAID vs. hardware RAID? Please stay tuned our updates in the next few days.


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