
Calculating the number of instances that can be provisioned to a compute node
The maximum number of virtual machines that can be provisioned to a compute resource is based
on the following:
• Amount of installed memory, available disk capacity, and number of CPU cores on the compute
resource
• Flavor settings of the virtual machines to be provisioned
• Resource oversubscription, which is individually applied to the memory, disk, and CPU
calculation
Table 11 (page 105) shows resource oversubscription rates so you can properly dimension the
capacity of your compute resources based on virtual machine size requirements.
NOTE: These rates are hard coded in CloudSystem Foundation and cannot be changed.
Table 11 Resource oversubscription rates for KVM and ESX
Physical to virtual oversubscription rateVirtual resourcePhysical resource
1:88 CPU cores1 CPU core
1:1.51.5 GB RAM1 GB RAM
1:11 TB disk1 TB disk
Import a cluster
Use this procedure to add an ESX cluster to the cloud. ESX clusters are imported from VMware
vCenter Server.
Prerequisites
• vCenter Server is registered in Integrated Tools
• ESX cluster is created in vCenter Server.
Procedure 54 Importing an ESX cluster
1. From the main menu, select Compute nodes.
2. Select Actions→Import.
The Import Cluster screen opens.
3. Select the vCenter Server you registered in Integrated Tools.
4. Select the datacenter.
5. Select the ESX cluster you want to import.
6. In the Activate field, click to toggle between Yes and No.
• Yes: cluster is imported and then activated.
• No: cluster is imported but is not activated. You can activate the cluster at a later time.
7. Click Import.
To exit the action without adding the cluster, click Cancel.
8. Verify that the ESX cluster appears on the Compute Node overview screen. Clusters that were
activated during the import action should have a green OK status. Clusters that were not
activated should have a grey Unknown status.
Activate a compute node
Before being activated, ESX clusters imported from vCenter Server and KVM compute nodes appear
on the Compute Nodes overview screen with a status of Unknown. Use the Activate action to add
Import a cluster 105
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