20-Vmware interview question L1-2025-
1-Q1. 1. Explain about the 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 hardware cases and how you rectified?
6- What is DRS rules and how it works?
7- What is your monitoring tool and how you will get alert?
8- How to upgrade or patching esxi host and brief explain?
9- In a cluster there are 3 nodes and one esxi host down what you do?
10- How to create datastore and before creating what steps required?
11-What is major incidents you handle in your career?
12-Why we can not take snapshot of VM?
13- What is affinity and antiafinity rules?
14- 2. Thin & Thick provison ?
15- Snapshot background process?
16- VM files ?
17-vCenter Migration steps?
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20-. What do you mean by RDM?
The Raw Device Mapping (RDM) files are contained in VMFS and act as proxies for raw physical devices. This feature enables VMware's virtual machines (VMs) to access logical unit numbers (LUNs) directly. This eliminates the need to use the virtual machine file system (VMFS) because the LUN can be formatted using any file system like NTFS (New Technology File System). It is generally beneficial for cluster configurations including VM-to-VM, physical-to-VM, or SAN (Storage Area Network) snapshots. But it has some limitations, including the inability to map disk partitions and possibly not working with direct-attached block devices
21- What is a VMKernel and Why is it Important?
The VMkernel is a critical component of the ESXi hypervisor that interacts with the hardware resources and provides services such as memory management, process scheduling, and network management. It handles the virtual machine operations and facilitates communication between VMs and physical resources like storage and networking.
1. How many port-groups that are configured in ESXi networking.
The following are the three port-groups configured in ESXi networking:
Virtual Machine Port Group: They are used for Virtual Machine Network.
Service Console Port Group: They are used for Service Console Communications.
VMKernel Port Group: They are used for vMotion, iSCSI, NFS (Network File System) Communications.
2. Explain about iSCSI storage.
Generally, iSCSI SANs consist of an iSCSI storage system, which houses one or more storage processors. Communication between the host and array occurs over TCP/IP protocol, and ESXi hosts are configured with an iSCSI initiator. Such an initiator is either hardware- or software-based. The hardware-based initiators can be dependent or independent; the software-based ones are called iSCSI software initiators.
3. What is the meaning of VVol?
vSphere 6.0 introduces the concept of Virtual Volume, also known as VVol, for managing virtual disks. Whenever a virtual disk is created in a virtual environment, VVol is automatically created. At the virtual disk level, it enables array-based operations.
4. How many CPUs can be used for a VM in FT in vSphere 7.0?
In VMware vSphere 7.0, up to 8 vCPUs can be used with the VMware vSphere Enterprise Plus license.
5. Explain FT logging traffic.
For VMware FT, fault tolerance logging traffic is considered as the second network requirement. For continuous data syncing between primary and secondary VMs, Fault Tolerance applies FT logging. Additionally, this is a VMkernel connection type used to move nondeterministic events from primary to secondary VMs.
6-. What do you mean by VMware HA and VMware FT? Difference between them.
VMware HA (High availability): It generally works on Cluster Level. By pooling VMs and the hosts they reside on into a cluster, VMware HA provides high availability for VMs. VMs running on a failed host are forced to be restarted on alternate hosts.
VMware FT (Fault Tolerance): It generally works on VM Level. In this, a secondary VM is created and maintained that is identical to the primary and can replace it when the ESXi host fails to provide continuous availability of VMs. A complete copy of a VM is made, including storage, computation, and memory. To configure FT, a 10GB NIC is recommended.
Difference between VMware HA and VMware FT-
While VMware HA is enabled per cluster, VMware FT is enabled per VM.
VMware HA works on cluster level whereas VMware FT works on VM level.
An HA system will restart and power on VMs on another host in the event of a failure, while an FT system will activate the second copy in case of a loss of the primary host. By providing fast backup and continuous availability, it reduces downtime.
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