By: George Crump Analyst, StorageSwiss.com
The storage infrastructure for multi-rack scale applications like Hadoop Spark, Cassandra, and CouchBase, are typically built using directly attached flash-based storage instead of a shared flash array. The motivation for using direct attached storage (DAS) is simple. Media inside a server is lower cost than media inside a shared array. Direct attached media also has lower latency and higher bandwidth than a shared array, since the array’s data undergoes storage array processing (RAID, DEDUP, Compression, Snapshots, etc.) and has to traverse a network. DAS though is not without its challenges; it isn’t used as efficiently and is more vulnerable to failure.