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Hitachi Digital Services Storage Administrator Interview Questions, Process, and Tips

Updated 7 Aug 2021

Hitachi Digital Services Storage Administrator Interview Experiences

1 interview found

I applied via Company Website and was interviewed in Jul 2021. There were 4 interview rounds.

Interview Questionnaire 

7 Questions

  • Q1. What is san ?
  • Ans. 

    SAN stands for Storage Area Network. It is a high-speed network that connects servers and storage devices.

    • SAN is a dedicated network that allows multiple servers to access shared storage resources.

    • It provides centralized storage management and allows for scalability and flexibility.

    • SANs use protocols like Fibre Channel or iSCSI to connect servers and storage devices.

    • SANs can be used for various purposes like data backu...

  • Answered by AI
  • Q2. What is nas
  • Ans. 

    NAS stands for Network Attached Storage. It is a file-level storage device that provides centralized data storage and access over a computer network.

    • NAS is a storage device that connects to a network and allows multiple users to access and share files.

    • It provides file-level access, meaning users can access individual files and folders stored on the NAS.

    • NAS devices often have their own operating system and can offer add...

  • Answered by AI
  • Q3. What is multipathing
  • Ans. 

    Multipathing is a technique used in storage systems to provide redundancy and load balancing by using multiple paths between servers and storage devices.

    • Multipathing improves storage system performance and availability.

    • It allows for load balancing by distributing I/O traffic across multiple paths.

    • Redundancy is achieved by having multiple paths in case one fails.

    • Multipathing can be implemented at the hardware or softwar...

  • Answered by AI
  • Q4. How many types of topologies in San and explain it one by one
  • Ans. 

    There are three types of topologies in SAN: point-to-point, arbitrated loop, and switched fabric.

    • Point-to-point topology connects two devices directly.

    • Arbitrated loop topology connects devices in a loop, where each device has a unique address.

    • Switched fabric topology connects devices through a central switch, allowing multiple simultaneous connections.

    • Examples: Fibre Channel (FC) and Internet Small Computer System Inte

  • Answered by AI
  • Q5. How many types of backup
  • Ans. 

    There are three types of backup: full, incremental, and differential.

    • Full backup: backs up all data and takes the longest time and uses the most storage space

    • Incremental backup: backs up only the changes made since the last backup and is faster and uses less storage space than a full backup

    • Differential backup: backs up all changes made since the last full backup and is faster than a full backup but uses more storage sp

  • Answered by AI
  • Q6. What is replication
  • Ans. 

    Replication is the process of creating and maintaining a copy of data or information in another location.

    • Replication ensures data availability and disaster recovery.

    • It can be synchronous or asynchronous.

    • Examples include database replication, file replication, and virtual machine replication.

  • Answered by AI
  • Q7. What is reduplication
  • Ans. 

    Reduplication is the process of eliminating duplicate data in storage systems.

    • Reduplication reduces storage space requirements and improves backup and recovery times.

    • It works by identifying and removing identical data blocks and replacing them with pointers to a single copy.

    • For example, if multiple users have the same file attachment in their emails, reduplication will store only one copy of the attachment and point to...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Just go through all the storage concepts and itil concepts and senarious in work environment

Skills evaluated in this interview

Interview questions from similar companies

Software Engineer Interview Questions & Answers

Adobe user image Devendra Bendkhale

posted on 4 Dec 2015

Interview Questionnaire 

8 Questions

  • Q1. WRITE A GENERIC SWAP FUNCTION
  • Ans. 

    A generic swap function swaps two values of any data type.

    • The function should take two parameters of any data type.

    • Use a temporary variable to store the value of one parameter.

    • Assign the value of the second parameter to the first parameter.

    • Assign the value of the temporary variable to the second parameter.

  • Answered by AI
  • Q2. SEARCH AN ELEMENT IN ROTATED SORTED LINKLIST .
  • Ans. 

    Search for an element in a rotated sorted linked list.

    • Find the pivot point where the list is rotated.

    • Divide the list into two sublists based on the pivot point.

    • Perform binary search on the appropriate sublist.

    • Handle edge cases such as empty list and list with only one element.

  • Answered by AI
  • Q3. SEARCH AN ELEMENT IN ROTATED SORTED ARRAY. WRITED A CODE FOR IT
  • Ans. 

    Search an element in a rotated sorted array

    • Find the pivot point where the array is rotated

    • Divide the array into two sub-arrays based on pivot point

    • Perform binary search on the appropriate sub-array

    • Repeat until element is found or sub-array size is 1

  • Answered by AI
  • Q4. In an Array of size 95 contain numbers in range 1 to 100. each number is at max once in the array. find the 5 missing numbers in array between 1-100
  • Ans. 

    Find 5 missing numbers in an array of size 95 containing numbers in range 1 to 100.

    • Create a boolean array of size 100 and mark the present numbers

    • Iterate through the boolean array and find the missing numbers

    • Alternatively, use a HashSet to store the present numbers and find the missing ones

  • Answered by AI
  • Q5. Given sudoku as id array of size . in a given empty cell find the possible numbers that could be possible. Asked me to write code for it
  • Ans. 

    Given a Sudoku board, find possible numbers for an empty cell.

    • Iterate through empty cells and check possible numbers using row, column, and box constraints.

    • Use a set to keep track of possible numbers for each empty cell.

    • Return the set of possible numbers for the given empty cell.

  • Answered by AI
  • Q6. Given 4 unsigned integers find their integer average (eg. (2,2,2,3) => (2+2+2+3)/4 = 2) consider integer division ) without typecasting
  • Ans. 

    Find integer average of 4 unsigned integers without typecasting

    • Add all the integers and divide by 4

    • Use bit shifting to divide by 4

    • Handle overflow by using long long data type

    • Use unsigned int data type for input

  • Answered by AI
  • Q7. Write a code to identify wheter given processor is of 32 bit architecture or 64 bit architecture
  • Ans. 

    Code to identify 32 bit or 64 bit architecture of a processor

    • Check if the operating system is 32 bit or 64 bit

    • If OS is 32 bit, processor is 32 bit

    • If OS is 64 bit, check if processor supports 64 bit architecture

    • Use CPUID instruction to check if processor supports 64 bit architecture

  • Answered by AI
  • Q8. Convert a binary number into base 64 integer
  • Ans. 

    Convert binary number to base 64 integer

    • Divide the binary number into groups of 6 bits

    • Convert each group of 6 bits to decimal

    • Map the decimal value to the corresponding base 64 character

    • Concatenate the base 64 characters to form the final integer

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: SIMPLE CODING QUESTIONS SPEED MATTERS.
Duration: 60 minutes
Total Questions: 3

Skills: Analytics And Coding
College Name: IIT Guwahati

Skills evaluated in this interview

Interview Questionnaire 

6 Questions

  • Q1. Solving puzzles(25 horses,ant and sweets,height of a building..) try as many as possible before appearing for interview
  • Q2. If experienced , then project details of previous companies a must prepare question
  • Q3. Writing test cases for random scenarios
  • Q4. Programming in whatsoever language you r comfortable with, basic coding problems of DS,Algos. eg. Zigzag tree traversal algo,random linked list copy
  • Q5. Some people asked me questions related to the work i will do if hired in the project
  • Q6. Be genuine in ur CV, and be prepared with everything you write there.

Interview Preparation Tips

College Name: Na

Interview Preparation Tips

General Tips: Just be confident. You may not be able to answer all the questions correctly. If you don't know the answer, be honest and confidently answer the questions that you know.
College Name: NIT SURATHKAL

I was interviewed before Mar 2021.

Round 1 - Face to Face 

(3 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on DSA and OOPS.

  • Q1. How do you dynamically allocate a 2D array in C?
  • Ans. 

    Use double pointer to dynamically allocate memory for array of strings in C.

    • Declare a double pointer to hold the 2D array of strings.

    • Allocate memory for the rows first using malloc.

    • Then allocate memory for each string in the row using malloc.

    • Assign values to the strings in the array.

    • Example: char **array = malloc(rows * sizeof(char *));

    • Example: array[i] = malloc(strlen(str) + 1); strcpy(array[i], str);

  • Answered by AI
  • Q2. What are virtual functions in C++?
  • Ans. 

    Virtual functions in C++ are functions that can be overridden in derived classes, allowing for polymorphic behavior.

    • Virtual functions are declared using the 'virtual' keyword in the base class.

    • They are used to achieve runtime polymorphism in C++.

    • Derived classes can override the virtual functions defined in the base class.

    • Example: class Base { public: virtual void display() { cout << 'Base class dis...

  • Answered by AI
  • Q3. What are virtual base classes?
  • Ans. 

    Virtual base classes are classes that are inherited virtually to avoid multiple instances of the same base class in a derived class hierarchy.

    • Virtual base classes are used in multiple inheritance to prevent the Diamond Problem.

    • They are declared with the 'virtual' keyword in the base class.

    • When a class inherits a virtual base class, the most derived class is responsible for initializing the virtual base class.

    • Example: c...

  • Answered by AI
Round 2 - Face to Face 

(4 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on OS/Networking etc.

  • Q1. What is the system call that creates a separate connection?
  • Ans. 

    The system call that creates a separate connection is fork()

    • fork() is a system call in Unix-like operating systems that creates a new process by duplicating the existing process

    • The new process created by fork() is called the child process, while the original process is called the parent process

    • fork() is commonly used in network programming to create separate connections for handling multiple clients

  • Answered by AI
  • Q2. What does the epoll_wait() system call do?
  • Ans. 

    epoll_wait() system call waits for events on an epoll instance

    • Used in Linux for I/O event notification

    • Blocks until one or more file descriptors become ready

    • Returns the number of file descriptors ready for I/O operations

  • Answered by AI
  • Q3. What are the different protocols used in the transport layer?
  • Ans. 

    Different protocols used in the transport layer include TCP, UDP, SCTP, and DCCP.

    • TCP (Transmission Control Protocol) - reliable, connection-oriented protocol used for most internet communication

    • UDP (User Datagram Protocol) - connectionless protocol used for applications where speed is more important than reliability

    • SCTP (Stream Control Transmission Protocol) - supports multiple streams of data, used for telecommunicati...

  • Answered by AI
  • Q4. What is the difference between TCP and UDP?
  • Ans. 

    TCP is a connection-oriented protocol that ensures reliable data delivery, while UDP is a connectionless protocol that focuses on speed.

    • TCP is reliable and ensures data delivery by establishing a connection before sending data.

    • UDP is faster but less reliable as it does not establish a connection before sending data.

    • TCP is used for applications that require high reliability and error correction, such as web browsing and...

  • Answered by AI
Round 3 - Face to Face 

(4 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on Networking etc.

  • Q1. What is the purpose of ICMP?
  • Ans. 

    ICMP is a protocol used for error reporting, diagnostics, and network management in IP networks.

    • ICMP is used to report errors in packet delivery

    • It is used for network diagnostics and troubleshooting

    • ICMP messages are encapsulated within IP packets

    • Examples include ping (echo request/reply) and traceroute

  • Answered by AI
  • Q2. What are the types of connection release supported by TCP?
  • Ans. 

    TCP supports four types of connection release: active close, passive close, simultaneous close, and abortive close.

    • Active close: Client initiates the connection release process by sending a FIN packet.

    • Passive close: Server initiates the connection release process by sending a FIN packet.

    • Simultaneous close: Both client and server send FIN packets to each other simultaneously.

    • Abortive close: Connection is terminated abru...

  • Answered by AI
  • Q3. What protocols are used by the MAC layer?
  • Ans. 

    The MAC layer uses protocols like CSMA/CA, CSMA/CD, and TDMA to manage access to the network.

    • CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is used in wireless networks to avoid collisions.

    • CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is used in wired networks to detect and handle collisions.

    • TDMA (Time Division Multiple Access) is used in networks where devices are assigned specific

  • Answered by AI
  • Q4. What is the ARP protocol?
  • Ans. 

    ARP (Address Resolution Protocol) is a protocol used to map an IP address to a MAC address in a local network.

    • ARP is used to resolve IP addresses to MAC addresses in a local network.

    • It operates at the data link layer of the OSI model.

    • ARP requests are broadcasted to all devices on the network.

    • Example: When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address correspo

  • Answered by AI

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAVMware Software India Private Limited interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Networking, OOPSTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewRejected

Skills evaluated in this interview

I applied via Job Portal and was interviewed in Mar 2021. There was 1 interview round.

Interview Questionnaire 

1 Question

  • Q1. Basic questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Overall good

I applied via Campus Placement and was interviewed in Jan 2016. There were 3 interview rounds.

Interview Preparation Tips

Round: Test
Experience: Tested basics in each subject

Round: Technical Interview
Experience: Had asked me about my projects in detail. Some DSA questions were asked. Asked to code in C for some questions.

Round: Technical Interview
Experience: Asked questions about data structures and some more algorithms. Tested in Probability and some quant.

College Name: IIT Madras

Interview Preparation Tips

Round: Resume Shortlist
Tips: It will be good to have a GPA of 8 and above

Round: Test
Experience: Questions were easy it were good at C and basic maths. Questions were distributed on all aspects of computer science such as Operating Systems, Few Output Question, Data Structures and Application layer networking . In basic aptitude most questions fall under Probability, distance and time and few others.
Duration: 60 minutes
Total Questions: 50

Skills: Communication, Basic Coding, Math Puzzle
College Name: NIT Surathkal

Interview Preparation Tips

Round: Test
Experience: The test was MCQ type. It comprised of questions from Operating Systems, Data Structures, Microprocessors, logical Reasoning, Aptitude and Computer Networks. No negative marking was there.
Tips: One needs to be fast as you can't spend much time on one question.
Duration: 60 minutes
Total Questions: 50

Round: Technical Interview
Experience: I was given 2 coding questions to solve and basics of oops, operating systems, data structures and networks were asked. 3-4 questions were asked in each topic mentions above. The interviewer also asked 2 puzzles which were the standard ones. He first asked me if I knew the topic or not, then only he asked me questions about it. But that doesn't mean that you can skip all the above mentions topics.
Tips: Be relaxed and confident and try to discuss your approach with the interviewer.

Round: Technical Interview
Experience: 2 Coding questions and 3-4 questions from operating systems and networks.Questions also from the mentioned projects.

Round: HR Interview
Experience: Standard HR interview with questions like what Cisco does and why they should hire you. He also asked me questions from the CV.

Tips: Be confident and mug up your cv well

Round: HR Interview
Experience: It was just a formality where he just asked about my background and whether I would be able to move to bangalore and Why I want to join Cisco.

Skills: Confidence, Problem Solving Skills, Operating System Basics, Coding Skills, Object Oriented Programming (OOP) Basics, Computer Networking, Data Strrutures
College Name: IIT Guwahati

I applied via Referral

Interview Questionnaire 

10 Questions

  • Q1. Program to print the elements of a binary tree in spiral order
  • Ans. 

    Program to print binary tree elements in spiral order

    • Use two stacks to keep track of nodes at odd and even levels

    • Push nodes from left to right in odd level stack and right to left in even level stack

    • Pop nodes from the stack alternatively and print them

    • Repeat until both stacks are empty

  • Answered by AI
  • Q2. Explain what happens underneath when you enter a URL in the browser
  • Ans. 

    Entering a URL in the browser triggers a series of events to retrieve and display the requested webpage.

    • The browser checks the cache for a previously stored copy of the webpage

    • If not found, the browser sends a request to the DNS server to resolve the domain name to an IP address

    • The browser then sends a request to the web server at the IP address for the webpage

    • The web server responds with the requested webpage

    • The brows...

  • Answered by AI
  • Q3. Explain why MAC addresses are required despite having IP addresses
  • Ans. 

    MAC addresses are required for identifying devices on a local network, while IP addresses are used for identifying devices on a global network.

    • MAC addresses are used for communication within a local network

    • IP addresses are used for communication across different networks

    • MAC addresses are assigned by the manufacturer and cannot be changed

    • IP addresses can be assigned dynamically or statically

    • MAC addresses are used in the...

  • Answered by AI
  • Q4. Solve the classical bridge and torch puzzle
  • Q5. Explain my internship project
  • Ans. 

    Developed a web application for tracking inventory and sales data

    • Used React.js for front-end development

    • Implemented RESTful APIs using Node.js and Express for back-end

    • Utilized MongoDB for database management

    • Integrated authentication and authorization features for secure access

    • Designed user-friendly interface with responsive design

  • Answered by AI
  • Q6. What is an arraylist in Java?
  • Ans. 

    An ArrayList is a dynamic array in Java that can grow or shrink in size during runtime.

    • ArrayList is a class in Java's Collection framework.

    • It implements the List interface and allows duplicate elements.

    • Elements can be added or removed using methods like add(), remove(), etc.

    • It can also be sorted using the sort() method.

    • Example: ArrayList names = new ArrayList<>();

    • names.add("John"); names.add("Mary"); names.remove(0);

  • Answered by AI
  • Q7. What is the difference between an arraylist and a linkedlist in Java?
  • Ans. 

    ArrayList is a resizable array while LinkedList is a doubly linked list.

    • ArrayList is faster for accessing elements while LinkedList is faster for adding or removing elements.

    • ArrayList uses contiguous memory while LinkedList uses non-contiguous memory.

    • ArrayList is better for random access while LinkedList is better for sequential access.

    • Example: ArrayList - List names = new ArrayList<>(); LinkedList - List names = new L

  • Answered by AI
  • Q8. “Java is not a pure OO language”. Justify (the answer expected was that the primitive types are not objects in Java!)
  • Ans. 

    Java is not a pure OO language due to primitive types not being objects.

    • Primitive types like int, boolean, etc. are not objects in Java

    • They do not have methods or inheritance like objects do

    • This violates the principle of everything being an object in pure OO languages

    • Wrapper classes like Integer, Boolean, etc. were introduced to provide object-like behavior for primitives

  • Answered by AI
  • Q9. What is the difference between an object oriented and object based language?
  • Ans. 

    Object-oriented languages support inheritance and polymorphism, while object-based languages do not.

    • Object-oriented languages allow for the creation of classes and objects, and support inheritance and polymorphism.

    • Object-based languages only support objects, but do not have the concept of classes or inheritance.

    • Examples of object-oriented languages include Java, C++, and Python, while JavaScript is an example of an obj

  • Answered by AI
  • Q10. Explain inheritance and abstraction with a concrete example
  • Ans. 

    Inheritance is a way to create new classes based on existing ones. Abstraction is a way to hide implementation details.

    • Inheritance allows a subclass to inherit properties and methods from a superclass.

    • Abstraction allows a class to provide a simplified interface to its users while hiding its implementation details.

    • For example, a Car class can inherit properties and methods from a Vehicle class, while also implementing i...

  • Answered by AI

Interview Preparation Tips

Skills:
College Name: NA

Skills evaluated in this interview

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Hitachi Digital Services Interview FAQs

How to prepare for Hitachi Digital Services Storage Administrator interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Hitachi Digital Services. The most common topics and skills that interviewers at Hitachi Digital Services expect are SAN, System Administration, EMC, Firmware and Analytical.
What are the top questions asked in Hitachi Digital Services Storage Administrator interview?

Some of the top questions asked at the Hitachi Digital Services Storage Administrator interview -

  1. How many types of topologies in San and explain it one by o...read more
  2. What is multipathi...read more
  3. How many types of back...read more

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