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VMware ESXi 5.0 CLI Commands

Cisco UCS and Mini-UCS

VMware Interview Questions and Answers. 2014

VMware Interview Questions and Answers.  

How many iscsi types is their? (HCL Technologies)

Ans) Two types of iscsi's  1)Software base iscsi. 2) Hardware based iscsi.

What is the difference between Thick Eager Zeroed and Thick Lazy Zeroed disks in VMware? (HCL Technologies)

Thick Provision Lazy Zeroed 
When we provision virtual machine disk format will take default as TPLZ (this TPLZ sometimes referred to as a flat disk) and disk creation time is faster.
TPLZ disk space is fully allocated when the virtual disk is created this space is not zeroed out upon creation but this space is zeroed on demand as first write from the virtual machine.

Thick Provision Eager Zeroed This TPEZ of virtual disk will supports clustering features such as Fault Tolerance (it was introduced in vSphere 4.0 Version) and disk creation time is slow compare with other disk types. TPEZ also allocated all space on creation and also zeroes (pre-zeroed) all the space out before it can be used.

Thin Provision format These format spaces requires on demand based up on guest operating system and use this TP to save storage space.

What is distributed switch (vds) ? (Accenture)

It was introduced in vSphere 4.0 version.
Whereas vSwitches(standard) are managed per host, vSphere Distributed Switches require vCenter Server, vSphere Distributed Switch working as a single virtual switch across all the associated ESXi hosts. 

Like a vSwitch, a vSphere Distributed Switch provides connectivity for VMs and VMkernel interfaces, vds leverages physical network adapters as uplinks to provide connectivity to the external physical network, vds can leverage VLANs for logical network segmentation. There are differences as well, but the biggest of these is that a vSphere Distributed Switch spans multiple servers in a cluster instead of each server having its own set of vSwitches. This greatly reduces complexity in clustered ESXi environments and simplifies the addition of new servers to an ESXi cluster.

What is the requirements for installing vCenter Server ? (CtrlS)

The vCenter Server 5.0 could be install on Physical Machine or Virtual Machine, it should have a 64 bit operating system cannot be installed on a 32 bit operating system(Window or Linux).
Processor : Intel or AMD x86 processor with two or more logical cores, each with a speed of at least 2GHz. The Intel Itanium (IA64) processor is not supported.
Disk Storage: 4GB. Disk requirements may be higher if the vCenter Server database runs on the same machine. In vCenter Server 5.0, the default size for vCenter Server logs is 450MB, which is larger than in vCenter server 4.x. make sure the disk space allotted to the log folder is sufficient for this increase.
Memory : 4GB RAM. VMware vCenter Management Web Services require 512Mb to 4,4GB of additional  installation depending on the inventory size.
Data base : Oracle 11g and Microsoft SQL Server 2008 R2 - Up to 2GB free disk space to decompress the installation archive. Approximately 1.5GB of these files are deleted after the installation is complete.
Networking : 1Gbit connection recommended. (data source is VMware document).

What are the third party tools are using in your Organization ? (IBM)

You have to tell like: Ticketing tools, Performance tracking tools and Backup tools etc.... 

Difference between ESX and ESXi ? (Accenture)

What is memory ballooning ? (Cognizant)

How do you identify Which one is HBA and Which one is NIC card? (TCS)

What is difference between VMFS-3 and VMFS-5? ( Wipro Technologies)

What is trunk port in VMware ? (Hcl Technologies)