MTV 2.12.0 Attributes and release notes

Signed-off-by: A.Arnold <anarnold@redhat.com> and Richard Hoch
<rhoch@redhat.com>

Author: anarnold97

documentation/modules/ref_known-issues-2-12.adoc

@@ -20,3 +20,10 @@ When the number of concurrent virtual machine (VM) migrations or migrating disks
 No known workaround exists.
 +
 link:https://redhat.atlassian.net/browse/MTV-1736[MTV-1736]
+
+Deploying many User Defined Networks simultaneously causes high pod ready latency and node failures::
+When migrating from VMware to OpenShift Virtualization or deploying User Defined Networks (UDNs), creating more than 72 UDNs and their attached resources simultaneously causes heavy resource contention. Open vSwitch (OVS) becomes starved for CPU time, and there is no observable way to determine if a UDN is fully created before resources are attached. As a consequence, high pod ready latency occurs, and nodes might enter a `NotReady` state.
++
+To work around this problem, limit simultaneous UDN creation to 72 or fewer. For deployments requiring more UDNs, create the UDNs upfront and wait for Open Virtual Network Kubernetes (OVNK) utilization to settle before deploying any resources attached to the UDNs. As a result, you maintain stable pod ready latency and prevent node failures.
++
+link:https://redhat.atlassian.net/browse/MTV-5695[MTV-5695]

documentation/modules/ref_resolved-issues-2-12-0.adoc

@@ -9,12 +9,6 @@
 [role="_abstract"]
 Review the resolved issues in this release of {project-short}.
 
-RDM disks converted to a LUN now have the correct SCSI interface type::
-Before this update, setting `spec.rdmAsLun=true` in a `MigrationPlan` converted the Raw Device Mapping (RDM) disk to a logical unit number (LUN) but kept the `virtio` interface instead of changing it to Small Computer System Interface (SCSI) [1, 2]. As a consequence, the LUN disk type was incompatible with the user interface (UI) [1, 2]. With this release, the interface type conversion for RDM disks in a `MigrationPlan` is corrected [1, 2]. As a result, RDM disks converted to a LUN have the required `SCSI` interface type [1, 2].
-+
-link:https://redhat.atlassian.net/browse/MTV-5610[MTV-5610]
-
-// looks like a duplicate to the above - are we ok to remove
 RDM disks converted to a LUN now have the correct SCSI interface type::
 Before this update, setting `spec.rdmAsLun=true` in a `MigrationPlan` converted the Raw Device Mapping (RDM) disk to a logical unit number (LUN) but kept the `virtio` interface instead of changing it to Small Computer System Interface (SCSI). As a consequence, the LUN disk type was incompatible with the user interface (UI). With this release, the interface type conversion for RDM disks in a `MigrationPlan` is corrected. As a result, RDM disks converted to a LUN have the required `SCSI` interface type.
 +