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which of the following technologies should be recommended for optimal I/O performance?

During the requirements definition phase for a database application, performance is listed as a top
priority. To access the DBMS files, which of the following technologies should be recommended
for optimal I/O performance?

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A.
Storage area network (SAN)

B.
Network Attached Storage (NAS)

C.
Network file system (NFS v2)

D.
Common Internet File System (CIFS)

Explanation:

In contrast to the other options, in a SAN comprised of computers, FC switches or routers and
storage devices, there is no computer system hosting and exporting its mounted file system for
remote access, aside from special file systems. Access to information stored on the storage
devices in a SAN is comparable to direct attached storage, which means that each block of data
on a disk can be addressed directly, since the volumes of the storage device are handled as
though they are local, thus providing optimal performance. The other options describe
technologies in which a computer (or appliance) shares its information with other systems. To
access the information, the complete file has to be read.


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