Managing physical and virtual resources such as hosts and virtual machines. This includes upgrading and adding hosts, importing domains, converting virtual machines created on foreign hypervisors, and managing virtual machine pools.
This string is generally sufficient. However, if you have a virtual machine with an older operating system or SPICE client, where either one or the other does not support FIPS-compliant encryption, you must use a weaker cipher string. Otherwise, a connection security error may occur if you install a new cluster or a new host in an existing cluster and try to connect to that virtual machine.
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A data center can contain multiple clusters, which can contain multiple hosts; it can have multiple storage domains associated to it; and it can support multiple virtual machines on each of its hosts. A oVirt environment can contain multiple data centers; the data center infrastructure allows you to keep these centers separate.
The export storage domain is deprecated. Storage data domains can be unattached from a data center and imported to another data center in the same environment, or in a different environment. Virtual machines, floating virtual disks, and templates can then be uploaded from the imported storage domain to the attached data center. See Importing Existing Storage Domains for information on importing storage domains.
Virtual machines start with the full amount of virtual memory you have assigned to them. As virtual memory usage exceeds RAM, the host relies more on swap space. If enabled, memory ballooning lets virtual machines give up the unused portion of that memory. The freed memory can be reused by other processes and virtual machines on the host. The reduced memory footprint makes swapping less likely and improves performance.
KSM consumes more CPU resources than memory ballooning. The amount of CPU KSM consumes remains consistent under pressure. Running identical virtual machines and applications on a host provides KSM with more opportunities to merge memory pages than running dissimilar ones. If you run mostly dissimilar virtual machines and applications, the CPU cost of using KSM may offset its benefits.
You can configure a virtual machine to use the Q35 chipset and UEFI before installing an operating system. Converting a virtual machine from legacy BIOS to UEFI is not supported after installing an operating system.
A Virtual Network Interface Card (vNIC) profile is a collection of settings that can be applied to individual virtual network interface cards in the Engine. A vNIC profile allows you to apply Network QoS profiles to a vNIC, enable or disable port mirroring, and add or remove custom properties. A vNIC profile also offers an added layer of administrative flexibility in that permission to use (consume) these profiles can be granted to specific users. In this way, you can control the quality of service that different users receive from a given network.
Select the Passthrough check box to enable passthrough of the vNIC and allow direct device assignment of a virtual function. Enabling the passthrough property will disable QoS, network filtering, and port mirroring as these are not compatible. For more information on passthrough, see Enabling Passthrough on a vNIC Profile.
Apply this profile to users and groups to regulate their network bandwidth. If you edited a vNIC profile, you must either restart the virtual machine, or hot unplug and then hot plug the vNIC if the guest operating system supports vNIC hot plug and hot unplug.
To use networks from an Open Virtual Network (OVN), register the provider with the Engine. See Adding an External Network Provider for more information. Then, use the following procedure to import the networks provided by that provider into the Engine so the networks can be used by virtual machines.
The selected networks are imported into the target data center and can be attached to virtual machines. See Adding a New Network Interface in the Virtual Machine Management Guide for more information.
If the passthrough fails because the hardware does not support interrupt remapping, you can consider enabling the allow_unsafe_interrupts option if the virtual machines are trusted. The allow_unsafe_interrupts is not enabled by default because enabling it potentially exposes the host to MSI attacks from virtual machines. To enable the option:
Using hooks to enable nested virtualization is a Technology Preview feature. Technology Preview features are not supported with Red Hat production service-level agreements (SLAs) and might not be functionally complete, and Red Hat does not recommend using them for production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information, see Red Hat Technology Preview Features Support Scope.
You should only run parent virtual machines on hosts that support nested virtualization. If a parent virtual machine migrates to a host that does not support nested virtualization, its child virtual machines fail. To prevent this from happening, configure all of the hosts in the cluster to support nested virtualization. Otherwise, restrict parent virtual machines from migrating to hosts that do not support nested virtualization.
Nested virtualization is a Technology Preview feature. Technology Preview features are not supported with Red Hat production service-level agreements (SLAs) and might not be functionally complete, and Red Hat does not recommend using them for production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information see Red Hat Technology Preview Features Support Scope.
To enable nested virtualization on specific virtual machines, not all virtual machines, you configure a host or hosts to support nested virtualization. Then you configure the virtual machine or virtual machines on run on those specific hosts and enable Pass-Through Host CPU. This option lets the virtual machines use the nested virtualization settings you just configured on the host. This option also restricts which hosts the virtual machines can run on and requires manual migration.
Only run parent virtual machines on hosts that support nested virtualization. If you migrate a parent virtual machine to a host that does not support nested virtualization, its child virtual machines will fail.
Avoid live migration of parent virtual machines that are running child virtual machines. Even if the source and destination hosts are identical and support nested virtualization, the live migration can cause the child virtual machines to fail. Instead, shut down virtual machines before migration.
Stop Pinned VMs shuts down any virtual machines that are pinned to hosts in the cluster, and is selected by default. You can clear this check box to skip updating those hosts so that the pinned virtual machines stay running, such as when a pinned virtual machine is running important services or processes and you do not want it to shut down at an unknown time during the update.
This information is provided for advanced system administrators who need to update hosts manually, but oVirt does not support this method. The procedure described in this topic does not include important steps, including certificate renewal, assuming advanced knowledge of such information. oVirt supports updating hosts using the Administration Portal. For details, see Updating individual hosts or Updating all hosts in a cluster in the Administration Guide.
Export Domain: Export domains are temporary storage repositories that are used to copy and move images between data centers and oVirt environments. Export domains can be used to backup virtual machines. An export domain can be moved between data centers, however, it can only be active in one data center at a time. Export domains can only be NFS-based. Only one export domain can be added to a data center.
Importing an existing data storage domain allows you to access all of the virtual machines and templates that the data storage domain contains. After you import the storage domain, you must manually import virtual machines, floating disk images, and templates into the destination data center. The process for importing the virtual machines and templates that a data storage domain contains is similar to that for an export storage domain. However, because data storage domains contain all the virtual machines and templates in a given data center, importing data storage domains is recommended for data recovery or large-scale migration of virtual machines between data centers or environments.
Importing an existing ISO storage domain allows you to access all of the ISO files and virtual diskettes that the ISO storage domain contains. No additional action is required after importing the storage domain to access these resources; you can attach them to virtual machines as required.
Importing an existing export storage domain allows you to access all of the virtual machine images and templates that the export storage domain contains. Because export domains are designed for exporting and importing virtual machine images and templates, importing export storage domains is recommended method of migrating small numbers of virtual machines and templates inside an environment or between environments. For information on exporting and importing virtual machines and templates to and from export storage domains, see Exporting and Importing Virtual Machines and Templates in the Virtual Machine Management Guide. 2ff7e9595c
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