Dell EMC Unity: Dynamic Pools, white paper, pgs 18-20
First of all we are assuming RAID 5 (4+1), which can be known by the fact they are using 5 drives, using the table on pg 20.
Answer is C :
“Figure 11 shows an example of a dynamic pool created with 5 x 400 GB drives and 1 x 800 GB flash drive. This assumes there is a RAID 5 pool with a stripe width of 4+1. In this example, many of the drive extents on the 800 GB drive cannot be used. These drive extents are outlined in red.”
C - The entire capacity of a particular drive size is only available when the drive count within the drive partnership group for the drive in question matches or exceeds the stripe width plus one drive. It is not recommended to mix different size drives of the same type for this reason, unless an adequate number of drives are available to meet or exceed the stripe width plus one drive requirement
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