Section 7 – Establish Service Levels
- Objective 7.1 – Create and Configure VMware Clusters
What are three requirements for a VMware HA cluster? (Choose three.)
A.Private Gigabit 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
E.name resolution between 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).
Which two CPU characteristics must be identical for a successful migration with VMotion between ESX Servers? (Choose two.)
A.CPU clock speed
C.CPU cache size
vSphere Resource Management Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 47.
VMotion transfers the running architectural state of a virtual machine between underlying ESX/ESXi hosts
VMotion compatibility means that the processors of the destination host must be able to resume execution using the equivalent instructions where the processors of the source host were suspended. Processor clock speeds and cache sizes might vary, but processors must come from the same vendor class (Intel versus AMD) [E above] and same processor family to be compatible for migration with VMotion.
CPU: CPU stepping
Processor families such as Xeon MP and Opteron are defined by the processor vendors.
You can distinguish different processor versions within the same family by comparing the processors’ model, stepping level, and extended features.
In some cases, processor vendors have introduced significant architectural changes within the same processor family (such as 64-bit extensions and SSE3) [D above].
VMware identifies these exceptions if it cannot guarantee successful migration with VMotion.
An ESX Server cluster has 15 servers, each with 4 CPUs at 1000 MHz. The QA department runs 30 virtual machines (VMs), each with 4 virtual CPUs. A requirement exists to ensure that no more than 50% of the CPU capacity of the cluster is in use by QA at any one time. You decide to place the QA VMs in a single resource pool. How should you configure the CPU resource settings for the resource pool?
A.deselect unlimited, set limit of 30000 MHz
B.select expandable reservation
C.deselect unlimited, set reservation of 4000, deselect expandable reservation
D.set shares to normal (4000)
1. The total available CPU resources on each host are (4 x 1000) 4000 MHz.
2. The total available CPU resources on the cluster are (15 x 4000) 60000 MHz.
3. By setting a CPU limit of 30000 MHz, (30000 / 60000) 50% of the CPU capacity of the cluster can be used by QA
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