This weeks topic was fairly interesting. I am really into corporation and talking about enterprise computing really had me going on this. In computing, a mirror is an exact copy of a data set. On the Internet, a mirror site is an exact copy of another Internet site. Mirror sites are most commonly used to provide multiple sources of the same information, and are of particular value as a way of providing reliable access to large downloads. Mirroring is a type of file synchronization. A live mirror is automatically updated as soon as the original is changed. Striped set with distributed parity or interleave parity requiring 3 or more disks. Distributed parity requires all drives but one to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive. A single drive failure in the set will result in reduced performance of the entire set until the failed drive has been replaced and rebuilt.
an enterprise storage is the computer storage designed for large-scale, high-technology environments of the modern enterprises. When comparing to the consumer storage, it has higher scalability, higher reliability, better fault tolerance, and much higher initial price. A Storage Area Network can best be thought of as a large pooled storage bucket. As servers or applications require more, the storage is allocated as necessary. A SAN centralizes and shares storage for multiple application servers, and optimizes file serving for end users. Each server participates in sharing the underlying storage resources, but the allocations are dedicated to the individual server or application on a server. This allows the organization to manage storage at a more granular level as well as provide a way to provision storage as needed, rather in large blocks to dedicated server like a traditional direct-attached RAID array.
http://www.hp.com/sbso/productivity/howto/san/components.html
http://en.wikipedia.org/wiki/Enterprise_storage
http://en.wikipedia.org/wiki/RAID#RAID_5
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