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For example, assume you have 2GHz available and specify a reservation of 1GHz for VM1 and 1GHz for VM2.
Now each virtual machine is guaranteed to get 1GHz if it needs it. However, if VM1 is using only 500MHz,
VM2 can use 1.5GHz.
Reservation defaults to 0. You can specify a reservation if you need to guarantee that the minimum required
amounts of CPU or memory are always available for the virtual machine.
Resource Allocation Limit
Limit specifies an upper bound for CPU and memory resources that can be allocated to a virtual machine.
A vDC can allocate more than the reservation to a virtual machine, but never allocates more than the limit,
even if there are unused resources on the system. The limit is expressed in concrete units (megahertz or
megabytes).
CPU and memory resource limits default to unlimited. When the memory limit is unlimited, the amount of
memory configured for the virtual machine when it was created becomes its effective limit in most cases.
In most cases, it is not necessary to specify a limit. You might waste idle resources if you specify a limit. The
system does not allow a virtual machine to use more resources than the limit, even when the system is
underutilized and idle resources are available. Specify a limit only if you have good reasons for doing so.
Configure Virtual Machine Resource Allocation Settings
You can configure the resource allocation settings (shares, reservation, and limit) to determine the amount of
CPU, memory, and storage resources provided for a virtual machine.
For more information about shares, reservations, and limits, see “Resource Allocation Shares,” on page 90,
“Resource Allocation Reservation,” on page 90, and “Resource Allocation Limit,” on page 91.
Prerequisites
A reservation pool vDC.
Procedure
1 Click My Cloud.
2 In the left pane, click VMs.
3 Select a virtual machine, right-click, and select Properties.
4 Click the Resource Allocation tab and set the priority, reservation, and limit for CPU and memory.
5 Click OK.
Modifying Virtual Machine Hard Disks
You can add hard disks, edit hard disks, and delete hard disk from a virtual machine.
Add a Virtual Machine Hard Disk
You can add a virtual hard disk to a virtual machine.
The virtual machine is powered off.
Procedure
1 Click My Cloud.
2 In the left pane, click VMs.
3 Select a virtual machine, right-click, and select Properties.
Chapter 9 Working with Virtual Machines
VMware, Inc. 91