VMware-vSphere5.5-Platform-Whats-New(11)

vSphere 5.5最新资料

What’s New in VMware vSphere 5.5 Platform

vSphere HA and vSphere Distributed Resource Scheduler

Virtual Machine–Virtual Machine Affinity Rules

vSphere DRS can configure DRS affinity rules, which help maintain the placement of virtual machines on hosts within a cluster. Various rules can be configured. One such rule, a virtual machine–virtual machine affinity rule, specifies whether selected virtual machines should be kept together on the same host or kept on separate hosts.

A rule that keeps selected virtual machines on separate hosts is called a virtual machine–virtual machine antiaffinity rule and is typically used to manage the placement of virtual machines for availability purposes.

In versions earlier than vSphere 5.5, vSphere HA did not detect virtual machine–virtual machine antiaffinity rules, so it might have violated one during a vSphere HA failover event. vSphere DRS, if fully enabled, evaluates the environment, detects such violations and attempts a vSphere vMotion migration of one of the virtual machines to a separate host to satisfy the virtual machine–virtual machine antiaffinity rule. In a large majority of environments, this operation is acceptable and does not cause issues. However, some environments might have strict multitenancy or compliance restrictions that require consistent virtual machine separation. Another use case is an application with high sensitivity to latency; for example, a telephony application, where migration between hosts might cause adverse effects.

To address the need for maintaining placement of virtual machines on separate hosts—without

vSphere vMotion migration—after a host failure, vSphere HA in vSphere 5.5 has been enhanced to conform with virtual machine–virtual machine antiaffinity rules. Application availability is maintained by controlling

the placement of virtual machines recovered by vSphere HA without migration. This capability is configured

as an advanced option in vSphere 5.5.

vSphere Big Data Extensions

vSphere Big Data Extensions (BDE) is a new addition in vSphere 5.5 for VMware vSphere Enterprise Edition™ and VMware vSphere Enterprise Plus Edition™. BDE is a tool that enables administrators to deploy and manage Hadoop clusters on vSphere from a familiar vSphere Web Client interface. It simplifies the provisioning of the infrastructure and software services required for multinode Hadoop clusters. BDE is based on technology from Project Serengeti, the VMware open-source virtual Hadoop management tool.

BDE is available as a plug-in for the vSphere Web Client. Administrators can deploy virtual Hadoop clusters through BDE, customizing variables such as number of Hadoop nodes in the cluster, size of Hadoop virtual machines, and choice of local or shared storage. BDE supports the deployment of all major Hadoop distributions, as well as ecosystem components such as Apache Pig, Apache Hive and Apache HBase.

BDE performs the following functions on the virtual Hadoop clusters it manages:

• Creates, deletes, starts, stops and resizes clusters

• Controls resource usage of Hadoop clusters

• Specifies physical server topology information

• Manages the Hadoop distributions available to BDE users

• Automatically scales clusters based on available resources and in response to other workloads on the vSphere cluster

Using BDE, administrators can provide multiple tenants with elastic, virtual Hadoop clusters that scale as needed to share resources efficiently. Another benefit of Hadoop on vSphere is that critical services in these Hadoop clusters can be protected easily using vSphere HA and VMware vSphere Fault Tolerance (vSphere FT). BDE offers ease of management and operational simplicity by automating many of these tasks for virtual Hadoop clusters.

T E C H N I C A L W H I T E P A P E R/11