Home » VMware » 2VB-601 » What is the purpose of the cache tier in an all-flash vSAN cluster?
What is the purpose of the cache tier in an all-flash vSAN cluster?
A. Read caching only.
B. 30% write caching and 70% read caching.
C. 20% write caching and 70% read caching and 10% checksum metadata.
D. Write caching only.
Correct Answer: D
Explanation/Reference:
Explanation: Since there is no read cache in all-flash vSAN clusters, the I/O flow is subtlety different when compared to a read operation on hybrid configurations. On an all-flash vSAN, when a read is issued, the write buffer is first checked to see if the block is present
References: https://www.vsan-essentials.com/chapter-5-architectural-details
D is closest to correct although documentation states 100% is dedicated to write buffering (not caching)