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A client has a storage requirement for an object database. The application is expected to
generate random I/O requests. The I/O profile is:

– 70% random reads
– 30% random writes
– Total host I/O per second is 20,000
– Required usable capacity is 35 TB
The client is concerned about cost, so RAID 5 (8+1) data protection will be used.
What is the minimum number of 300 GB 15K SAS drives needed to meet the client’s performance
and storage requirements, including hot spares drives?

A.
223

B.
166

C.
292

D.
238