The major differences between different storage systems for data centers is whether the storage disk is attached directly or through a network. Storage Area Network (SAN) - Both DAS and NAS can be considered part of a Storage Area Network. These other terms describe the type of connection, while a SAN is any combination of storage drives and Unlike a scale out NAS system access to the file system is granted through the file system interface of the scale out file system and not through NAS protocols. Figure 2: Scale out file system architecture. A scale out file system does not have the NFS bottleneck as shown below which really differentiates it from a scale out NAS system. RAID 5: Uses striping and parity across at least three disks to split data between two of the disks, while the third maintains parity data, allowing the array to be rebuilt if a drive fails. RAID 5 arrays offer fast read speeds but slower write speeds. RAID 6: Uses double parity striping across a minimum of four disks. RAID 1 - It follows the Mirroring mechanism, meaning data on the blocks are copied and replicated to multiple drives. It offers a great reading speed. However, writing the same data on different drives slows down the process. RAID 5 - It is based on the Parity mechanism and requires at least three disks. If the main goal is to store 4-16 TB and access it wherever, a NAS is clearly more cost effective. Every new server on the market will have more powerful internal components than a NAS. Compared to the $400 NAS setup mentioned above, a bottom tier server with the same amount of storage will end up costing around $200 more. High administrative costs. DAS is BEST for small businesses that share data locally, and companies that have little to no IT support to maintain a complex system. 2. Network-Attached Storage (NAS) NAS is a dedicated server that attaches to a network. Users can access it through an assigned network address. .

difference between nas and das