HCLTech Vmware Administrator Interview Questions and Answers

Q1. Regarding VMware network
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Q1. What is major incidents you handle in your career
Ans. 
I have handled major incidents such as server crashes, network outages, and data breaches.
• Server crashes

• Network outages

• Data breaches
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Q2. Senerio based questions
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Q1. Explain about your role and responsibilities
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Q1. 1. What is Virtualization ? 2. Thin & Thick provison ? 3. Snapshot background process? 4. VM files ? 5. vCenter Migration steps?
Ans. 
Virtualization is the process of creating a virtual version of a device or resource, such as a server, storage device, network or operating system.
• Virtualization allows multiple virtual machines to run on a single physical machine, maximizing resources and increasing efficiency.

• Thin provisioning allocates storage space on an as-needed basis, while thick provisioning allocates all required space upfront.

• Snapshots captur...read more
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Q2. Explain ESXi OS upgrade and rollback procedures ?
Ans. 
ESXi OS upgrade and rollback procedures involve careful planning and execution to ensure system stability.
• Before upgrading, ensure compatibility with hardware and software requirements

• Take backups of important data and configurations

• Use VMware Update Manager or command line interface for upgrade process

• Monitor upgrade progress and resolve any issues that may arise

• For rollback, restore from backups taken before upgrade
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Q3. What is thick provisioned eager and lazy zero ?
Ans. 
Thick provisioned eager and lazy zero are types of disk provisioning in VMware.
• Thick provisioned eager zeroed: allocates all the space for a virtual disk at the time of creation and zeros out the disk blocks immediately.

• Thick provisioned lazy zeroed: allocates all the space for a virtual disk at the time of creation but does not zero out the disk blocks until data is written to them.
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Q4. Snapshot background process while initiating through vCenter or ESXi host ?
Ans. 
Snapshot background process involves creating a point-in-time copy of a virtual machine's disk file.
• Snapshots are created to capture the current state of a virtual machine's disk file

• When a snapshot is initiated through vCenter or ESXi host, a background process is triggered to create the snapshot

• The background process involves freezing the virtual machine's disk file, creating a delta disk to store changes, and redire
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Q5. What is lockdown technology in VMware ?
Ans. 
Lockdown technology in VMware restricts access to the ESXi host directly, allowing only authorized users to perform specific actions.
• Lockdown mode can be enabled to prevent direct access to the ESXi host

• Only users with specific permissions can perform actions on the host

• Helps enhance security by limiting access to the host

• Can be configured through the vSphere Client or vSphere Web Client
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Q1. 1. Explain about the your roles and responsibilities?
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Q1. 1. Explain about your roles and responsibilities? 2. What is Raid and type of Raid? 3. If esxi fails or down what will happen? 4. If get datastore disk space alert what you will do? 5. Did you raise any...read more
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Q1. Salary discussion
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Q1. Vsan, esxi troubleshooting, upgrade &patching of esxi, vCenter, drs, HA, FT,... Etc
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Q1. Documents verification and Salary discussion
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Round duration - 140 minutes
Round difficulty - Medium

Test timing was at 2:00 pm , it was conducted in a college and the environment was good for the test. Camera was a primary part of test, so no suspicious activity.

Q1. 
Sum of Two Numbers Represented as Arrays
Given two numbers in the form of two arrays where each element of the array represents a digit, calculate the sum of these two numbers and return this sum as an ar...read more
Ans. 
Given two numbers represented as arrays, calculate their sum and return the result as an array.
• Iterate through the arrays from right to left, adding digits and carrying over if necessary

• Handle cases where one array is longer than the other by considering the remaining digits

• Ensure the final sum array does not have any leading zeros
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Round duration - 20 minutes
Round difficulty - Easy

The round was conducted at around 12 p.m. I was called at the college location and then it was conducted. The interviewer was quite polite and frank.

Round duration - 8 minutes
Round difficulty - Easy

This round was conducted right after finishing and clearing the technical round at the same place and on the same day.