[HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
Question 1. **In a Hitachi VSP system, which element is primarily responsible for managing the
write‑back cache?**
A) Front‑end director
B) Cache controller
C) Back‑end disk module
D) Element manager
Answer: B
Explanation: The cache controller resides in the back‑end and handles write‑back caching,
improving I/O performance by temporarily storing writes before they are flushed to disks.
Question 2. **What protocol does the Hitachi Command Suite (HCS) use to communicate with
the Element Manager for hardware status collection?**
A) SNMP
B) SSH
C) HTTPS/REST API
D) Telnet
Answer: C
Explanation: HCS uses HTTPS‑based REST APIs to securely retrieve health and status information
from the Element Manager.
Question 3. **Which of the following best describes the role of the Common Services layer in
HCS architecture?**
A) Provides host‑side multipathing
B) Hosts the GUI and authentication services
C) Manages physical disk spindles
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
D) Performs data deduplication
Answer: B
Explanation: The Common Services layer supplies the web server, authentication, and session
management that support the HCS graphical user interface.
Question 4. **When creating a Logical Device (LDEV) in Hitachi Device Manager, which
parameter defines the stripe size?**
A) LDEV ID
B) RAID level
C) Stripe unit (SU)
D) Capacity
Answer: C
Explanation: The stripe unit determines the amount of data written to each disk before moving
to the next, influencing performance and RAID calculations.
Question 5. **In the context of host provisioning, what does WWN stand for?**
A) Wide World Name
B) World Wide Number
C) World Wide Name
D) Wide Wire Network
Answer: C
Explanation: WWN is a unique identifier assigned to Fibre Channel ports, used for host
registration and LUN masking.
Question 6. **Which Hitachi feature enables thin provisioning of virtual volumes?**
A) Dynamic Link Manager (HDLM)
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
B) Hitachi Dynamic Provisioning (HDP)
C) Global Link Manager (HGLM)
D) Storage Navigator
Answer: B
Explanation: HDP provides thin provisioning by allocating space on demand from a shared pool,
allowing over‑commitment of capacity.
Question 7. **What is the primary purpose of an “Inflow Control” setting on an external storage
volume?**
A) To limit the number of host connections
B) To regulate the maximum I/O rate entering the volume
C) To encrypt data at rest
D) To schedule periodic backups
Answer: B
Explanation: Inflow Control throttles incoming I/O to prevent overload of the external storage
system, maintaining performance stability.
Question 8. **Which component of Hitachi Path Management provides centralized control of
multipathing software across multiple arrays?**
A) HDLM
B) HGLM
C) Device Manager CLI
D) Storage Navigator
Answer: B
Explanation: Global Link Manager (HGLM) consolidates configuration and monitoring of
multipathing agents (e.g., PowerPath, MPIO) across the enterprise.
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
Question 9. **In HDLM, what does the “Active‑Passive” path designation indicate?**
A) Both paths are simultaneously used for I/O
B) One path is used for I/O while the other is standby
C) Both paths are idle
D) Paths are load‑balanced based on latency
Answer: B
Explanation: Active‑Passive means one path handles all I/O traffic while the other remains idle,
ready to take over if the active path fails.
Question 10. **Which performance metric on the HCS dashboard indicates the average time
taken to complete I/O requests?**
A) Throughput (MB/s)
B) IOPS
C) Latency
D) Cache hit ratio
Answer: C
Explanation: Latency measures the average response time per I/O operation, a key indicator of
storage performance.
Question 11. **When configuring alerts in HCS, which threshold would most likely trigger a
capacity warning?**
A) 70 % of total pool used
B) 90 % of cache memory used
C) 50 % of CPU utilization
D) 30 % of disk temperature increase
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
Question 1. **In a Hitachi VSP system, which element is primarily responsible for managing the
write‑back cache?**
A) Front‑end director
B) Cache controller
C) Back‑end disk module
D) Element manager
Answer: B
Explanation: The cache controller resides in the back‑end and handles write‑back caching,
improving I/O performance by temporarily storing writes before they are flushed to disks.
Question 2. **What protocol does the Hitachi Command Suite (HCS) use to communicate with
the Element Manager for hardware status collection?**
A) SNMP
B) SSH
C) HTTPS/REST API
D) Telnet
Answer: C
Explanation: HCS uses HTTPS‑based REST APIs to securely retrieve health and status information
from the Element Manager.
Question 3. **Which of the following best describes the role of the Common Services layer in
HCS architecture?**
A) Provides host‑side multipathing
B) Hosts the GUI and authentication services
C) Manages physical disk spindles
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
D) Performs data deduplication
Answer: B
Explanation: The Common Services layer supplies the web server, authentication, and session
management that support the HCS graphical user interface.
Question 4. **When creating a Logical Device (LDEV) in Hitachi Device Manager, which
parameter defines the stripe size?**
A) LDEV ID
B) RAID level
C) Stripe unit (SU)
D) Capacity
Answer: C
Explanation: The stripe unit determines the amount of data written to each disk before moving
to the next, influencing performance and RAID calculations.
Question 5. **In the context of host provisioning, what does WWN stand for?**
A) Wide World Name
B) World Wide Number
C) World Wide Name
D) Wide Wire Network
Answer: C
Explanation: WWN is a unique identifier assigned to Fibre Channel ports, used for host
registration and LUN masking.
Question 6. **Which Hitachi feature enables thin provisioning of virtual volumes?**
A) Dynamic Link Manager (HDLM)
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
B) Hitachi Dynamic Provisioning (HDP)
C) Global Link Manager (HGLM)
D) Storage Navigator
Answer: B
Explanation: HDP provides thin provisioning by allocating space on demand from a shared pool,
allowing over‑commitment of capacity.
Question 7. **What is the primary purpose of an “Inflow Control” setting on an external storage
volume?**
A) To limit the number of host connections
B) To regulate the maximum I/O rate entering the volume
C) To encrypt data at rest
D) To schedule periodic backups
Answer: B
Explanation: Inflow Control throttles incoming I/O to prevent overload of the external storage
system, maintaining performance stability.
Question 8. **Which component of Hitachi Path Management provides centralized control of
multipathing software across multiple arrays?**
A) HDLM
B) HGLM
C) Device Manager CLI
D) Storage Navigator
Answer: B
Explanation: Global Link Manager (HGLM) consolidates configuration and monitoring of
multipathing agents (e.g., PowerPath, MPIO) across the enterprise.
, [HAT680] HAT 680 HITACHI DATA SYSTEMS QUALIFIED
PROFESSIONAL STORAGE ADMINISTRATION Certification
Exam Guide
Question 9. **In HDLM, what does the “Active‑Passive” path designation indicate?**
A) Both paths are simultaneously used for I/O
B) One path is used for I/O while the other is standby
C) Both paths are idle
D) Paths are load‑balanced based on latency
Answer: B
Explanation: Active‑Passive means one path handles all I/O traffic while the other remains idle,
ready to take over if the active path fails.
Question 10. **Which performance metric on the HCS dashboard indicates the average time
taken to complete I/O requests?**
A) Throughput (MB/s)
B) IOPS
C) Latency
D) Cache hit ratio
Answer: C
Explanation: Latency measures the average response time per I/O operation, a key indicator of
storage performance.
Question 11. **When configuring alerts in HCS, which threshold would most likely trigger a
capacity warning?**
A) 70 % of total pool used
B) 90 % of cache memory used
C) 50 % of CPU utilization
D) 30 % of disk temperature increase
