Consider the following factors when selecting drives:
In an S2D setup, up to three types of drives can be used simultaneously in a pool. The fastest media is used for caching. The Ready Node for this solution provides various options for performance and sizes of drives. NVMe is the fastest available media. HDDs are the least expensive media that can be used to maximize capacity. Multi-use SSDs are in the middle of the spectrum, balancing cost and capacity.
To determine the capacity and the number of required drives, use volume sizing guidelines, approximate sizes of databases, and expected growth. Select caching media to supply the required amount of IOPS for the database.