A storage administrator has a Dell Unity XT 480 system with one pool of flash drives, 192 GB of RAM, and 1.2 TB of FAST Cache. What is the total cache available for caching the flash drives?

The total cache in a Dell Unity XT system is the sum of its System Cache (DRAM) and its FAST Cache (Flash drives). In this scenario, the System Cache is 192 GB and the FAST Cache is 1.2 TB. The total cache capacity is calculated as 1.2 TB + 192 GB. Converting 192 GB to TB (192 / 1024 ≈ 0.1875 TB) and adding it to the FAST Cache gives a total of approximately 1.39 TB. Note that FAST Cache is not used for all-flash pools; however, the question asks for the total available cache in the system.

A. 6.0 TB is an arbitrary value with no basis in the provided system specifications.
C. 3.58 TB is an arbitrary value with no basis in the provided system specifications.
D. 3.2 TB is an arbitrary value with no basis in the provided system specifications.

- Dell EMC Unity: FAST Technology Overview

White Paper (April 2020)

Page 5

"System Cache": "System cache is the DRAM in the storage processors." Page 6

"FAST Cache": "FAST Cache is a feature that uses Flash drives to extend the capacity of the system cache."

- Dell Unity XT 480/F Specification Sheet (June 2022)

Page 2

"Max FAST Cache": Shows the maximum FAST Cache capacity. The total cache is the sum of this and the system DRAM.