[HAT420] HAT 420 Hitachi Data Systems Certified Professional Modular storage installation Certification Exam Preparation

[HAT420] HAT 420 Hitachi Data Systems Certified
Professional Modular storage installation Certification
Exam Preparation
**Question 1.** Which component houses the cache memory in a Hitachi Modular storage
system?

A) Drive Box (DBX)

B) Controller Box (CBL)

C) Power Supply Unit (PSU)

D) Management Module



Answer: B

Explanation: The Controller Box contains the cache memory modules that accelerate read/write
operations.



**Question 2.** In a dual‑controller (active‑active) architecture, what is the primary benefit of
having both controllers active simultaneously?

A) Reduced power consumption

B) Automatic load balancing and failover

C) Simplified cabling

D) Increased cache size



Answer: B

Explanation: Active‑active controllers share I/O load and provide seamless failover if one
controller fails.



**Question 3.** Which front‑end port type supports Fibre Channel over Ethernet (FCoE) on
Hitachi Modular systems?

A) FC‑4Gb

B) iSCSI‑10GbE

, [HAT420] HAT 420 Hitachi Data Systems Certified
Professional Modular storage installation Certification
Exam Preparation
C) FCoE‑10GbE

D) SAS‑12Gb



Answer: C

Explanation: FCoE uses Ethernet physical links to transport Fibre Channel frames, and Hitachi
Modular provides dedicated FCoE ports.



**Question 4.** What is the maximum floor loading (kg per U) recommended for a standard
19‑inch rack housing a Hitachi Modular controller?

A) 10 kg/U

B) 15 kg/U

C) 20 kg/U

D) 25 kg/U



Answer: C

Explanation: Hitachi specifies up to 20 kg per rack unit to ensure structural integrity.



**Question 5.** Which SAS cabling pattern provides the highest redundancy for back‑end
connectivity?

A) Top‑down only

B) Bottom‑up only

C) Dual‑loop (top‑down and bottom‑up)

D) Single‑ended



Answer: C

, [HAT420] HAT 420 Hitachi Data Systems Certified
Professional Modular storage installation Certification
Exam Preparation
Explanation: Dual‑loop cabling creates two independent paths, protecting against a single cable
or port failure.



**Question 6.** When initially powering on a Hitachi Modular system, which component must
be powered on first?

A) Expansion trays

B) Main controllers

C) Management module

D) Power distribution unit



Answer: A

Explanation: Expansion trays are powered first to allow the controllers to detect all attached
drives during boot.



**Question 7.** Which drive technology is NOT supported in Hitachi Modular’s standard drive
bays?

A) SSD (Flash)

B) SAS 12 Gb/s

C) NL‑SAS (Near‑Line SAS)

D) NVMe over PCIe



Answer: D

Explanation: Hitachi Modular uses SAS‑based bays; NVMe drives are not natively supported in
the standard configuration.

, [HAT420] HAT 420 Hitachi Data Systems Certified
Professional Modular storage installation Certification
Exam Preparation
**Question 8.** In Hitachi Storage Navigator Modular 2, which menu is used to create a new
RAID group?

A) System → Firmware

B) Storage → RAID Groups

C) Network → Zones

D) Tools → Diagnostics



Answer: B

Explanation: The “Storage → RAID Groups” menu allows administrators to define parity groups
and assign RAID levels.



**Question 9.** What does the “4+4” notation represent in a Hitachi RAID‑6 configuration?

A) 4 data drives + 4 parity drives

B) 4 SSDs + 4 SAS drives

C) 4 TB capacity + 4 TB overhead

D) 4 active controllers + 4 standby controllers



Answer: A

Explanation: “4+4” indicates four data disks and four parity disks, typical for RAID‑6 which uses
double parity.



**Question 10.** Which logical device type is used to present a thin‑provisioned volume to a
host?

A) LDEV (Logical Device)

B) LUN (Logical Unit Number)

C) Snapshot