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Table Of Contents
Option Action
Memory allocation
Enter the maximum amount of memory, in GB, to allocate to virtual machines
running in the organization vDC.
Memory resources guaranteed
Enter the percentage of memory resources to guarantee to virtual machines
running in the organization vDC. You can overcommit resources by
guaranteeing less than 100%.
vCPU Speed
Enter the vCPU speed in GHz. Virtual machines running in the organization
vDC are assigned this amount of GHz per vCPU.
Maximum number of VMs
Enter the maximum number of virtual machines that can be created in the
organization vDC.
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Click Next.
Example: Configuring an Allocation Model
When you create an organization vDC, vCloud Director creates a vSphere resource pool based on the allocation
model settings you specify. See Table 3-1, Table 3-2, and Table 3-3.
Table 3-1. How Allocation Pool Settings Affect Resource Pool Settings
Allocation Pool
Setting
Allocation Pool
Value Resource Pool Setting Resource Pool Value
CPU Allocation 25 GHz CPU Limit 25 GHz
CPU % Guarantee 10% CPU Reservation 2.5 GHz
Memory Allocation 50 GB Memory Limit 50 GB
Memory % Guarantee 20% Memory Reservation 10 GB
Table 3-2. How Pay-As-You Go Settings Affect Resource Pool Settings
Pay-As-You-Go
Setting
Pay-As-You-Go
Value Resource Pool Setting Resource Pool Value
CPU % Guarantee 10% CPU Reservation, CPU Limit 0.00 GHz, Unlimited
Memory % Guarantee 100% Memory Reservation, Memory
Limit
0.00 GB, Unlimited
Resource pools created to support Pay-As-You-Go organization vDCs will always have no reservations or
limits.
Pay-As-You-Go settings only affect overcommitment. A 100% guarantee means no overcommitment is
possible. The lower the percentage, the more overcommitment is possible.
Table 3-3. How Reservation Pool Settings Affect Resource Pool Settings
Reservation Pool
Setting
Reservation Pool
Value Resource Pool Setting Resource Pool Value
CPU Allocation 25 GHz CPU Reservation, CPU Limit 25 GHz, 25 GHz
Memory Allocation 50 GB Memory Reservation, Memory
Limit
50 GB, 50 GB
Allocate Storage
An organization vDC requires storage space for vApps and vApp templates. You can allocate storage from
the space available on provider vDC datastores.
Thin provisioning can help avoid over-allocating storage and save storage space. For a virtual machine with
a thin virtual disk, ESX/ESXi provisions the entire space required for the disk's current and future activities.
ESX/ESXi commits only as much storage space as the disk needs for its initial operations.
vCloud Director Administrator's Guide
30 VMware, Inc.