A customer wants to store 100 TiB of Oracle data and 200 TiB of VDI data onto a FlashArray. When checking the data reduction ratio, the given data…

The minimum useable capacity required on the FlashArray is the physical space needed after data reduction is applied to the logical data. This is calculated by dividing the logical data size by its corresponding data reduction ratio for each workload and then summing the results.

Oracle: 100 TiB (logical) / 4 (ratio) = 25 TiB (physical)

VDI: 200 TiB (logical) / 5 (ratio) = 40 TiB (physical)

The total minimum useable capacity is the sum of the physical capacity required for both workloads:

25 TiB + 40 TiB = 65 TiB.

A. 40TiB: This value represents the physical capacity required for the VDI workload only (200 TiB / 5), incorrectly omitting the capacity needed for the Oracle data.

C. 300TiB: This is the total logical capacity (100 TiB + 200 TiB) before applying any data reduction, not the required physical (useable) capacity.

D. 750TiB: This value is the result of an incorrect calculation and does not represent either the logical or the required physical capacity based on the provided ratios.

1. Pure Storage, "Purity//FA Architecture White Paper": This document explains the core data reduction technologies within the Purity Operating Environment. The concept of the Total Data Reduction ratio is defined as the ratio of logical user data stored to the physical flash space consumed. The calculation in the explanation directly applies this principle. (See section: "Purity Reduce").

2. Pure Storage, "FlashArray Best Practices for Oracle Database": This guide discusses typical data reduction rates for Oracle workloads, validating the concept of applying a specific ratio (like the 4:1 given in the question) to determine physical capacity needs from a logical data size. (See section: "Capacity Savings with FlashArray").

3. Pure Storage, "Sizing with Confidence" Technical Brief: This document outlines the methodology for sizing a FlashArray. It emphasizes calculating the required physical capacity by applying expected data reduction ratios to the source logical data sizes, which is the exact procedure required to solve the question. (See section: "Calculating Total Reduction").