System Administrator

1. Why to place a Host in Maintenance Mode You place a host in maintenance mode when you need to service it, for example, to upgrade memory, CPU OR to install an upgrade, etc. A host enters or leaves maintenance mode only as the result of an admin/user’s request. Virtual machines that are running on a host that is entering maintenance mode needs to be migrated to another host (either manually or automatically by DRS) or it is shut down.  The host is in a state of Entering Maintenance Mode until all running virtual machines are powered down or migrated to different hosts.  You cannot power on virtual machines or transfer (migrate)other virtual machines to a host entering maintenance mode.  When no more running virtual machines are on the host, the host’s icon changes to include “Maintenance Mode” and the host’s Summary panel (left side) indicates the new state.  While in maintenance mode, the host does not allow you to deploy or power on a virtual machine.  Once the required

Checklist for VMware High Availability environment setup To setup the VMware Cluster in High Availability environment all the checkpoint answers should be Yes then only your VMware cluster will work in High Availability mode. Sr. No. Check point Status 1 Are all the VMware hosts licensed for VMWARE HA? Yes / No 2 Are there at least two Hosts in VMware cluster? Yes / No 3 Do all the hosts have unique names? Yes / No 4 Do all hosts have static IP? If using DHCP make sure that the address for each host persists across reboots. Yes / No 5 Do all the hosts have at least one common management network access? Yes / No 6 Do all the ESX hosts have service console network? Yes / No 7 For ESXi :VMKernal network host must be earlier than version 4.0. Yes / No

1. What is a Hypervisor? It is a program that allows multiple operating systems to share a single hardware host. Each operating system appears to have the host's processor, memory, and other resources all to itself. However, the hypervisor is actually controlling the host processor and resources, allocating what is needed to each operating system in turn and making sure that the guest operating systems (called virtual machines) cannot disrupt each other. 2. What is the hardware version used in VMware ESXi 5.5? Version 10 Below is the table showing the different version of hardware used in different VMware products along with their release version Virtual Hardware Version Products 10 ESXi 5.5, Fusion 6.x, Workstation 10.x, Player 6.x 9 ESXi 5.1, Fusion 5.x, Workstation 9.x, Player 5.x 8 ESXi 5.0, Fusion 4.x, Workstation 8.x, Player 4.x 7 ESXi/ESX 4.x, Fusion 2.x/3.x Workstation 6.5.x/7.x,Player 3.x