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What is the difference between NAS (Network Attached Storage) and HDFS?

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Here are the key differences between NAS and HDFS:

Network-attached storage (NAS) is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS can either be a hardware or software which provides a service for storing and accessing files. Whereas Hadoop Distributed File System (HDFS) is a distributed file system to store data using commodity hardware.

In HDFS, data blocks are distributed across all the machines in a cluster. Whereas in NAS, data is stored on a dedicated hardware.

HDFS is designed to work with MapReduce paradigm, where computation is moved to the data. NAS is not suitable for MapReduce since data is stored separately from the computations.

HDFS uses commodity hardware which is cost effective, whereas a NAS is a high-end storage devices which includes high cost.

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