Merge pull request #39384 from sabrinajess/CNV13866

CNV-13866 and CNV-13122: New SNO content

Author: sjhala-ccs

modules/virt-about-vm-templates.adoc

@@ -22,3 +22,8 @@ In the Templates tab, you cannot edit or delete Red Hat Supported or Red Hat Pro
 Using a Red Hat template is convenient because the template is already preconfigured. When you select a Red Hat template to create your own custom template, the *Create Virtual Machine Template* wizard prompts you to add a boot source if a boot source was not added previously. Then, you can either save your custom template or continue to customize it and save it.
 
 You can also select the *Create Virtual Machine Template* wizard directly and create a custom virtual machine template. The wizard prompts you to provide configuration details for the operating system, flavor, workload type, and other settings. You can add a boot source and continue to customize your template and save it.
+
+[IMPORTANT]
+====
+Due to differences in storage behavior, some virtual machine templates are incompatible with SNO. To ensure compatibility, do not set the `evictionStrategy` field for any templates or virtual machines that use data volumes or storage profiles.
+====

modules/virt-single-node-cluster.adoc

@@ -0,0 +1,12 @@
+// Module included in the following assemblies:
+//
+// * virt/install/preparing-cluster-for-virt.adoc
+
+[id="virt-single-node-cluster_{context}"]
+= Changes in {VirtProductName} behavior on a single node cluster
+
+You can use {VirtProductName} with single node clusters, also known as Single Node OpenShift (SNO). These clusters are not configured for high-availability operation, which results in significant changes to {VirtProductName} behavior.
+
+* {VirtProductName} components have only one replica, and pod disruption budgets do not apply.
+* Live migration is not supported.
+* Due to differences in storage behavior, some virtual machine templates are incompatible with SNO. To ensure compatibility, do not set the `evictionStrategy` field for any templates or virtual machines that use data volumes or storage profiles.

virt/install/preparing-cluster-for-virt.adoc

@@ -70,4 +70,9 @@ To obtain an evaluation version of {product-title}, download a trial
 from the {product-title} home page.
 ====
 
+include::modules/virt-single-node-cluster.adoc[leveloffset=+1]
+
+.Additional resources
+* xref:../../operators/operator_sdk/osdk-ha-sno.adoc#osdk-ha-sno[High-availability or single node cluster detection and support]
+
 include::modules/virt-cluster-resource-requirements.adoc[leveloffset=+1]

virt/virtual_machines/virt-create-vms.adoc

@@ -22,6 +22,11 @@ When you create virtual machines from the web console, select a virtual machine
 
 Templates without a boot source are labeled as *Boot source required*. You can use these templates if you complete the steps for xref:../../virt/vm_templates/virt-creating-vm-template.adoc#virt-adding-a-boot-source-web_virt-creating-vm-template[adding a boot source to the virtual machine].
 
+[IMPORTANT]
+====
+Due to differences in storage behavior, some virtual machine templates are incompatible with SNO. To ensure compatibility, do not set the `evictionStrategy` field for any templates or virtual machines that use data volumes or storage profiles.
+====
+
 include::modules/virt-creating-vm-quick-start-web.adoc[leveloffset=+1]
 include::modules/virt-creating-vm-wizard-web.adoc[leveloffset=+1]