Friday, February 1, 2013

Data archival landscape

Data explodes continously and companies are forced to retain this data over longer periods of time. Consequently, the companies look forward to more capable archival solutions. And there are different vendors and technologies in this space. Many have overlapping ideas or technology propositions and it can become quite murky with the various jargons each one uses. Here is a glossary of a few key concepts.
1. NAS : Network Accessible Storage is probably the most common form of large scale storage for files and clusters. These are shared nothing commodity serves joined together with high-speed network so that they create a combined storage space for the data. As opposed to SAN or Storage Area Network, NAS uses IP network to connect the servers. SAN is used for large databases.
2. Appliance : A storage appliance is logically a drive to interacting systems. Physically, it may comprise of a server that allows for addition and removal of disk drives. These can grow to very large number and size in terms of drive and capacity. Moreover, they can comprise of very complex organization of servers and drives in a scaled architecture to enable generational data and archival. Their appeal includes low maintenance and little or no custom application for integration.
3. Tiering: Tiering is yet another solution from storage industry which enables policies to be specified for generational mark-down of data and its movement between tiers. This enables differentiation of hardware for space to suit various storage traffic. By providing tiers, the storage space is now prioritized based on media cost and usage.
 

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