A VMware administrator needs to simplify the placement of virtual machines. The administrator also needs to balance I/O load and space utilization automatically.
Which combination of features should the administrator use to achieve this?
A. Create a Datastore Cluster and enable Storage DRS on the cluster
B. Create a Datastore Cluster and enable Storage I/O Control on each datastore
C. Enable Storage DRS and Storage I/O Control on each datastore
D. Enable Storage I/O Control on each datastore and configure Storage vMotion
Correct Answer: A
Explanation/Reference:
Explanation:
A datastore cluster is a collection of datastores with shared resources and a shared management interface. Datastore clusters are to datastores what clusters are to hosts. When you create a datastore cluster, you can use vSphere Storage DRS to manage storage resources.
When you add a datastore to a datastore cluster, the datastore’s resources become part of the datastore cluster’s resources. As with clusters of hosts, you use datastore clusters to aggregate storage resources, which enables you to support resource allocation policies at the datastore cluster level.
The following resource management capabilities are also available per datastore cluster.
Storage DRS provides initial placement and ongoing balancing recommendations to datastores in a Storage DRS-enabled datastore cluster.
Initial placement occurs when Storage DRS selects a datastore within a datastore cluster on which to place a virtual machine disk. This happens when the virtual machine is being created or cloned, when a virtual machine disk is being migrated to another datastore cluster, or when you add a disk to an existing virtual machine.
Initial placement recommendations are made in accordance with space constraints and with respect to the goals of space and I/O load balancing. These goals aim to minimize the risk of over-provisioning one datastore, storage I/O bottlenecks, and performance impact on virtual machines.
Incorrect Answers:
B: Storage I/O Control enables you to control the amount of storage I/O that is allocated to virtual machines during periods of I/O congestion, which ensures that more important virtual machines get preference over less important virtual machines for I/O resource allocation. It does not enable you to balance I/O load and space utilization automatically.
C: Storage I/O Control enables you to control the amount of storage I/O that is allocated to virtual machines during periods of I/O congestion, which ensures that more important virtual machines get preference over less important virtual machines for I/O resource allocation. It does not enable you to balance I/O load and space utilization automatically.
D: Storage I/O Control enables you to control the amount of storage I/O that is allocated to virtual machines during periods of I/O congestion, which ensures that more important virtual machines get preference over less important virtual machines for I/O resource allocation. It does not enable you to balance I/O load and space utilization automatically.
References:
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.resmgmt.doc/GUID-E12EA49F-972A-4417-819F-D3B965EF0A48.html
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.resmgmt.doc/GUID-598DF695-107E-406B-9C95-0AF961FC227A.html