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Manage VM Protection Policies. Recovering VMs From Snapshots. High Availability. About XenServer HA. HA Requirements. VM Restart Settings. Configure HA. Disable HA. Change HA Settings. Disaster Recovery DR. About XenServer DR. Configuring DR. Test Failover. Managing Users. RBAC overview. Definitions of RBAC roles and permissions. Join a domain and add users. Assign roles to users and groups.
Calculating RBAC roles. Audit changes. Workload Balancing Overview. Getting Started with Workload Balancing. Workload Balancing Basic Concepts. Connecting to Workload Balancing.
Introduction to Basic Tasks. Accepting Optimization Recommendations. Working with Workload Balancing Reports. Using Workload Balancing Reports for Tasks. Generating and Managing Workload Balancing Reports. Workload Balancing Report Glossary. Audit Log Events. Editing Workload Balancing Settings. Adjusting the Optimization Mode. Optimizing and Managing Power Automatically. Changing the Critical Thresholds. Tuning Metric Weightings. Excluding Hosts from Recommendations.
Advanced Settings. Administering Workload Balancing. Disconnecting from Workload Balancing. Updating Workload Balancing credentials. Troubleshooting Workload Balancing. Issues Entering Workload Balancing Credentials. Issues Starting Workload Balancing.
Workload Balancing Connection Errors. Issues changing Workload Balancing servers. Monitoring System Performance. About Performance Monitoring. Viewing Performance Data.
Configuring Performance Graphs. Configuring Performance Alerts. Updates and Upgrades. About Software Updates and Upgrades. Upgrading Managed Servers. Updating Managed Servers.
Live Patching in XenServer. Applying Automated Updates. Installing Supplemental Packs. Updating XenCenter. Dom0 has drivers for hardware, and it provides Xen virtual disks and network access for guests each referred to as a domU unprivileged domains. For hardware that is made available to other domains, like network interfaces and disks, it will run the BackendDriver , which multiplexes and forwards to the hardware requests from the FrontendDriver in each DomU.
Unless DriverDomain 's are being used or the hardware is passed through to the domU , the dom0 is responsible for running all of the device drivers for the hardware. One of these is in charge of running the rest of the system, and is known as domain 0, or dom0. It is the first domain to boot after Xen, and owns the storage and networking hardware, the device drivers, and the primary control software.
Any other VM is unprivileged, and is known as a domU or guest. This gives a level of security isolation between the privileged system software and the OpenStack software much of which is customer-facing.
This architecture is described in more detail later. This refers to the interaction between Xen, domain 0, and the guest VM's kernel. PV guests are aware of the fact that they are virtualized and will co-operate with Xen and domain 0; this gives them better performance characteristics. HVM guests are not aware of their environment, and the hardware has to pretend that they are running on an unvirtualized machine. HVM guests do not need to modify the guest operating system, which is essential when running Windows.
A basic OpenStack deployment on a XAPI-managed server, assuming that the network provider is nova-network, looks like this:. OpenStack VM: The Compute service runs in a paravirtualized virtual machine, on the host under management. Each host runs a local instance of Compute.
It is also running an instance of nova-network. It usually means binding those services to the management interface. Tenant network: controlled by nova-network, this is used for tenant traffic. The networks shown here must be connected to the corresponding physical networks within the data center. In the simplest case, three individual physical network cards could be used. It is also possible to use VLANs to separate these networks.
Please note, that the selected configuration must be in line with the networking model selected for the cloud. In case of VLAN networking, the physical channels have to be able to forward the tagged traffic. What is Xen?
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