VMware Interview Questions for 100% Selection – Part 1

1. How to fix slow performance of a VM?

– Check resource allocation (CPU, memory, disk I/O).
– Use `esxtop` to monitor performance metrics.
– Verify VM snapshots and consolidate if necessary.
– Command: `esxtop`

1. If the host is not responding, what is your next step?

– Check physical connectivity (network, power).
– Restart management agents:

/etc/init.d/hostd restart
/etc/init.d/vpxa restart

3. Management service restart command?

services.sh restart

4. ESXi stuck in maintenance mode?

• Manually migrate VMs using:

  vim-cmd vmsvc/getallvms
  vim-cmd vmsvc/migrate <VMID> <HostID>
  

1. How to add a new datastore in a cluster?

– Use vSphere Client or CLI:

esxcli storage filesystem rescan

1. How to migrate a disk from one datastore to another?

– Use Storage vMotion or:

vmkfstools --clonevirtualdisk <source.vmdk> --newvirtualdisk <destination.vmdk>

1. How to check storage issues from VMware side?

– Use `esxtop` to monitor disk latency.
– Check logs:

cat /var/log/vmkernel.log

1. How to fix PSOD (Purple Screen of Death) error?

– Collect logs:

vm-support

– Reboot the host and check hardware compatibility.

9. How to solve recurring VM slow performance?

• Optimize VM settings (CPU, memory, disk).
• Use performance monitoring tools like vRealize Operations.

10. VM stuck during vMotion?

• Check network connectivity and retry.
• Use:

  vim-cmd vmsvc/getallvms
  vim-cmd vmsvc/migrate <VMID> <HostID>
  

What Undercode Say

VMware administration requires a deep understanding of virtualization, storage, and networking. Commands like esxtop, vim-cmd, and `vmkfstools` are essential for troubleshooting and performance optimization. Regularly monitor logs (/var/log/vmkernel.log) and use tools like vRealize Operations for proactive management. Upgrading ESXi and vCenter requires careful planning, including pre-checks and baseline creation. RAID configurations (RAID 5, RAID 6) play a critical role in storage performance and redundancy. Always ensure compatibility and test upgrades in a lab environment before deploying to production. For advanced features like vSAN and DRS, understanding slot calculations and IOPS is crucial. VMware’s ecosystem is vast, and mastering it involves continuous learning and hands-on practice.

Useful URLs:

• VMware Documentation
• ESXi Command-Line Interface Guide
• vSphere Monitoring and Performance

References:

initially reported by: https://www.linkedin.com/posts/santhosh-guriginjakunta-262b55283_vmware-interview-question-for-100-selection-activity-7302249688496250881-KaOw – Hackers Feeds
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