Final answer:
The cache tier in an all-flash vSAN cluster primarily provides both read and write caching, with a 30% and 70% split respectively. It serves as a temporary data store for frequently accessed data and data awaiting to be written, thereby enhancing system performance.
Step-by-step explanation:
In an all-flash vSAN cluster, the primary purpose of the cache tier is to provide both read and write caching, as indicated in option B. This splits between 30% write caching and 70% read caching. The cache tier in such a system acts as a sort of temporary storage for data that is frequently accessed or awaiting to be written. This design enhances performance by reducing latency in data access. This cache tier's efficiency is crucial in ensuring optimal read and write speeds within all-flash vSAN clusters, facilitating the high-speed, low-latency operations for which these systems are known.
Learn more about cache tier in all-flash vSAN cluster