When it comes to picking a data storage solution, companies can choose from a variety of options, but the most common ones fall into three categories:
1.Direct Attached Storage (DAS)
2.Network Attached Storage (NAS)
3.Storage Area Network (SAN)
DAS:
DAS solutions are typically the simplest and the cheapest. High capacity backup hard drives, solid state drives, and optical disc drives are all examples of DAS solutions. Because of the relatively cheap price and minimal space obstruction, DAS is a great choice for very small businesses with only a handful of employees. Remote access is usually not possible with DAS.
NAS:
Small to mid-size companies have more demanding data storage requirements than small businesses. NAS allows these companies to store data in a centralized location, and can be accessed remotely from various devices on your network. NAS are usually pieces of hardware fitted with multiple hard drives in a RAID configuration, and can be connected to a switch or router on a network via a network interface card. If your business is looking for centralized storage, remote access, file sharing, and scalability, consider utilizing a NAS solution.
SAN:
SAN solutions are a good fit for large companies and enterprises that have the space to store multiple disk arrays, switches, and servers. SAN gives access to large blocks of data between servers and storage devices across multiple locations. This solution is a necessity for any large company that needs to reliably and quickly access massive amounts of data. SAN also provides a higher level of data security and is much more fault tolerant than NAS and DAS.
Reference: https://solutionsreview.com/data-storage/data-storage-units-of-measurement-chart-from-smallest-to-largest/
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