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What are the benefits of going with a Direct Attached Storage system?
As oppose to going with a Network Attached Storage or a Storage Area Network?
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4 Answers
NAS/SAN storage systems are designed to pool physical storage among a number of different servers/users whereas direct storage is designed to be accessed directly by a single server or user. The tradeoffs between the two (NAS/SAN vs. DAS) generally come down to performance, scalability, manageability, and cost. NAS/SAN require that all data and communication go through the network and be processed by the storage array's embedded control system, which can start to create bottlenecks and/or extra latency in an environment with heavy concurrent storage access. On the other hand, DAS systems typically have lower utilization (because they aren't pooling physical storage) and as a result don't have the same cost economies of scale as SAN/NAS.
As CTW indicates, for systems such as data warehouses that require fast access to data and for systems with a high degree of parallelism (also typical of data warehouses), DAS is commonly used because it's often cheaper and faster for that type of application.
this is a very usefull for direct cooneect to pc to server
NAS/SAN storage systems are designed to pool physical storage among a number of different servers/users whereas direct storage is designed to be accessed directly by a single server or user. The tradeoffs between the two (NAS/SAN vs. DAS) generally come down to performance, scalability, manageability, and cost. NAS/SAN require that all data and communication go through the network and be processed by the storage array's embedded control system, which can start to create bottlenecks and/or extra latency in an environment with heavy concurrent storage access. On the other hand, DAS systems typically have lower utilization (because they aren't pooling physical storage) and as a result don't have the same cost economies of scale as SAN/NAS.
As CTW indicates, for systems such as data warehouses that require fast access to data and for systems with a high degree of parallelism (also typical of data warehouses), DAS is commonly used because it's often cheaper and faster for that type of application.
Cheaper than a SAN and they tend to be faster for certain types of applications. For example, data warehouse systems often perform better on direct attach storage.
SANs tend to have economies of scale, but you may want (for example) to use a SAN for operational systems and direct attach storage for a data warehouse system.
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