Home » VMware » VCP550D » What would benefit the most from enabling vFlash Read Cache?
An administrator needs to configure vFlash Read Cache to improve performance.
What would benefit the most from enabling vFlash Read Cache?
A. Virtual machines replicated with vSphere Replication
B. Web Server virtual machines
C. Database virtual machines
D. Virtual machines migrated using Storage vMotion
Correct Answer: B
Explanation/Reference:
Explanation:
A Virtual Flash Read Cache lets you accelerate virtual machine performance through the use of host resident flash devices as a cache.
The Flash Read Cache works best with workloads that are read intensive, with a high rate of repeat accesses to the same blocks, locality of access to blocks.
A Web Server is an example of a read intensive server. Users use a Web browser to request a website from the Web server and the Web server reads the website from disk to return to the client. With the same web content being requested by many clients, performance can be improved by caching the web content in the fast Virtual Flash Read Cache.
Incorrect Answers:
A: Virtual Flash Read Cache does not improve the performance of VM replication. Therefore, this answer is incorrect.
C: A database VM could benefit from Virtual Flash Read Cache for data that is read frequently. However, the data in a database usually changes more frequently than website content. Data in the cache could quickly become out of date so to ensure the latest data, the data would need to be read from the database disk thus eliminating the benefit of the Virtual Flash Read Cache.
D: Virtual Flash Read Cache does not improve the performance of Storage vMotion. Therefore, this answer is incorrect.