In simple words, Direct Attached Storage (DAS) is a storage device directly attached to a host system, such as the internal hard drive of a server computer. In order to store data for the computer system, the DAS is the most well-known method. This is considered as the core element that is promoted by Oracle and several other startups. In 2004, the Sun’s Honeycomb filter box introduces Nutanix’s Compete Cluster and Oracle’s Exadata and Exalogic along with incorporated server or storage supplies. The DAS model is then reinvented by these modern developments and a kind of clustered DAS. There is a threat according to the dominant nature of SAN among the direct-attached storage and SAN preference. Moreover, SAN provides extraordinary and well-organized storage elements to many servers as compared to DAS.In a typical SAN display, the server-based applications obtain storage I/Os completed in a constantly short time and data is saved from missing. In addition, many servers share the infrastructure provided by SAN to access the application. However, SAN data can be accessed by any independent servers. The applications assume that they are using DAS while but in reality, they are accessing a SAN. In order to speed up the applications, the SUN Honeycomb is implicated by placing NAS disks into the similar inclusion while using multiple servers and advanced file systems. This proposal did not spread commonly but it worked for Sun. Moreover, once the Oracle is purchased by the Sun, the class was generated for super charged Exalogic and Exadata boxes.The typical SAN was produced and created earlier than utilization of VMware and server virtualization. If this is accomplished, the servers can get a larger number of cores and sockets. For instance, a physical servers including CPU in working condition along with Windows became a two socket, quad-core computer and contain eight cores.