Section 7 – Establish Service Levels
- Objective 7.1 – Create and Configure VMware Clusters
In configuring a VMware HA Cluster the System Administrator can configure Admission Control. There are two options. Do not power on Virtual Machines if they violate availability constraints, or Virtual Machines to be powered on even if they violate availability constraints.
If the System Administrator chooses the option “Do not power on Virtual Machines if they violate availability” then which of the following apply? Select two.
A.Virtual Machines running on failed ESX hosts will not be restarted on surviving ESX hosts.
B.VMware HA restarts VM’s on surviving host with the most unreserved capacity.
C.Only Virtual Machines with a high restart priority will be restarted on surviving ESX hosts.
D.VMware HA enforces the failover capacity defined for the cluster.
vSphere Availability Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 12 and 13.
You can configure VMware HA to tolerate a specified number of host failures. With the Host Failures Cluster Tolerates admission control policy, VMware HA ensures that a specified number of hosts can fail and sufficient resources remain in the cluster to fail over all the virtual machines from those hosts.
In the event of a host failure, the virtual machines running on that host are failed over, that is, restarted on the alternate hosts with the most available unreserved capacity (CPU and memory.)
Which of the following are requirements for a VMware HA cluster? (Choose Two.)
A.a private Ethernet network for all hosts
B.access to shared storage from all hosts
C.identical type and quantity of CPUs in each host
D.access to the virtual machine networks from all hosts
Clusters Enabled for HA
For clusters enabled for HA, all virtual machines and their configuration files must reside on shared storage (typically a SAN), because you must be able to power on the virtual machine on any host in the cluster. This also means that the hosts must be configured to have access to the same virtual machine network and to other resources. Each host in an HA cluster must be able to resolve the host name and IP address of all other hosts in the cluster. To achieve this, you can either set up DNS on each host (preferred) or fill in the
/etc/hosts entries manually (error prone and discouraged).
What is the difference between partially automated and fully automated DRS clusters?
A.Partially automated clusters are a result of a fully automated cluster becoming yellow.
B.Fully automated clusters migrate virtual machines to optimize resource usage.
C.Partially automated clusters migrate virtual machines using a more conservative algorithm.
D.Fully automated clusters do not take individual virtual machine rules into account.
The screenshot below shows that fully automated clusters migrate virtual machines to optimize resource usage
Which of the following situations will result in VMware HA restarting virtual machines? (Choose Two.)
A.A guest OS is manually powered off.
B.A guest OS fails.
C.An ESX Server in the cluster is put into Maintenance mode.
D.An ESX Server in the cluster becomes isolated from the network.
VMware vSphere – VMware High Availability
1. Monitors virtual machines to detect operating system and hardware failures.
2. Restarts virtual machines on other physical servers in the resource pool without manual intervention when server failure is detected.
3. Protects applications from operating system failures by automatically restarting virtual machines when an operating system failure is detected [B above]
vSphere Availability Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 22 and 23.
Host isolation response determines what happens when a host in a VMware HA cluster loses its service console networks (or VMkernel networks, in ESXi) connection but continues running. Host isolation responses require that Host Monitoring Status is enabled. When this occurs, the host executes its isolation response. The responses are:
Leave VM powered on, Power off VM, and Shut down VM.
VM Monitoring restarts individual virtual machines if their VMware Tools heartbeats are not received within a set time. You can configure the degree to which VMware HA is sensitive to such non-responsiveness. If you select Enable VM Monitoring, the VM Monitoring service (using VMware Tools) evaluates whether each virtual machine in the cluster is running by checking for regular heartbeats from the VMware Tools process running inside the guest. If no heartbeats are received, this is most likely because the guest operating system has failed or VMware Tools is not being allocated any time to complete tasks. In such a case, the VM Monitoring service determines that the virtual machine has failed and the virtual machine is rebooted to restore service.
Therefore, if an ESX Server in the cluster becomes isolated from the network, it can be configured to shut down a virtual machine, which can then result in VM Monitoring restarting the individual virtual machine, [D above].
Which of the following is a key feature of VMware High Availability services?
A.HA can VMotion Virtual Machines to surviving ESX servers.
B.HA can automatically restart Virtual Machines from a failed ESX server
C.HA can take the place of other cluster software, like Microsoft Cluster Services (MSCS)
D.HA can automatically restart failed ESX Servers.
Only DRS will use VMotion to move Virtual Machines around to adjust to changes in CPU/Memory performance on ESX servers.
Which statement is true about running both DRS and VMware HA (HA) on the same cluster?
A.There is no advantage to running these two technologies on the same cluster as they are completely unrelated.
B.After a host failure, HA can start virtual machines intelligently using DRS algorithms.
C.After a host failure, HA will restart virtual machines and DRS will migrate them to balance the workloads.
D.This is not a recommended configuration.
Automating High Availability (HA) Services with VMware HA, page 4.
1. VMware VMotion enables the live migration of running virtual machines from one physical server to another. Live migration of virtual machines enables companies to perform hardware maintenance without scheduling downtime and disrupting business operations. VMotion also allows the mapping of virtual machines to hosts to be continuously and automatically optimized within clusters for maximum hardware
utilization, flexibility, and availability.
2. VMware DRS works with VMotion to provide automated resource optimization and virtual machine placement and migration to help align available resources with pre-defined business priorities while maximizing hardware utilization.
In a fully automated DRS cluster, what can be done to ensure that a specific virtual machine (VM) does not migrate automatically to another host?
A.do nothing because the DRS cluster must be put in Partially Automated mode to allow this level of control
B.use the Affinity Wizard to specify manual automation
C.set the DRS VM options report_section = “8” for the specific VM to Partially Automated
D.set the DRS VM rule to “keep on this host”
Need help to find the setting Report_Section = “8” in VC
This DRS settings is made to be added in the “Edit Settings” of a cluster on the Tab “Summary” go to “VmWare DRS” and on the down right corner you have “Advanced Options”, when opened, you have a row “Option” and a row “Value” “report_section” is to be put in “Option” row and the “8” is to be put in Value.
It apparently stops Vmotioning between all nodes of the cluster.
vCenter Server is running within a virtual machine (VM) that is part of a VMware HA and DRS cluster. The vCenter VM can migrate between all hosts in the cluster by using VMotion. DRS is configured for partial automation. What happens if the ESX host that is currently running the vCenter VM experiences a power outage?
A.This situation cannot occur because vCenter cannot be installed on a VMware HA cluster.
B.All DRS cluster operations will be unavailable until the ESX host is brought back online.
C.vCenter will stay offline, but all virtual machines on the remaining hosts will continue without interruption.
D.VMware HA will restart the vCenter VM on another host.
vSphere Availability Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, Page 11.
VMware HA provides high availability for virtual machines by pooling them and the hosts they reside on into a cluster. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts.
What can prevent a successful migration with VMotion?
A.one of the virtual disks that is a mapped SAN LUN
B.network cards located in different server slots
C.a physical CD-ROM that is connected from the virtual machine
D.different CPU clock speeds
VMware DRS and VMotion: Improve workload balance, prevent problems Some virtual machines may fail to migrate, whether by automatic VMotion task or if evoked manually. This is generally caused by obsolete virtual machines, CD-ROM binding or other reasons that may not be intuitive
You can perform a migration with VMotion on virtual machines with disks on _____.
A.Fibre Channel-SAN based datastores only
B.NAS and Fibre Channel SAN-based datastores only
C.iSCSI and Fibre Channel SAN based datastores only
D.iSCSI, NAS and Fibre Channel SAN-based datastores
VMware Storage VMotion – Non-Disruptive Live Migration for Virtual Machine Storage Disk Files Support for multiple storage types.
Implement live migration of virtual machine disk files between and among Fibre Channel, iSCSI, and NAS storage systems.
|One Time Purchase||✔||✖||✖||✖||✖|
|100% Pass Guarantee||✔||✖||✖||✖||✖|
|100% Money Back||✔||✖||✖||✖||✖|