Source content: https://access.redhat.com/site/solutions/402913 This bug requests more detail in the "Required Networks, Optional Networks, and Virtual Machine Networks" topic, specifically with regards to creating scheduling and migration policies. For example, this topic can explain: 1. When a required network becomes non-operational, the virtual machines running on the network are fenced and migrated to another host. This is useful for machines running mission critical workloads. 2. When a non-required network becomes non-operational, the virtual machines running on the network will not be migrated to another host. This is useful for virtual machines running non-critical operations, as it prevents unnecessary I/O overload caused by mass migrations. https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.2/html-single/Technical_Reference_Guide/index.html#Virtual_Machine_Networks_and_Optional_Networks (It might also be worth adding mention of required networks for high availability virtual machines, but I haven't found a good place for this information)
Topic 10994 updated as described below. Revision History [21138] updated. 3.3.0-004 Moving to POST. What Changed ------------ I added the following paragraphs: When a non-required network becomes non-operational, the virtual machines running on the network are not migrated to another host. This prevents unnecessary I/O overload caused by mass migrations. When a required network becomes non-operational, the virtual machines running on the network are fenced and migrated to another host. This is beneficial if you have machines running mission critical workloads.
Documentation Link ------------------ http://documentation-devel.engineering.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/3.3/html-single/Technical_Reference_Guide/index.html#Virtual_Machine_Networks_and_Optional_Networks What Changed ------------ I added the following paragraphs: When a non-required network becomes non-operational, the virtual machines running on the network are not migrated to another host. This prevents unnecessary I/O overload caused by mass migrations. When a required network becomes non-operational, the virtual machines running on the network are fenced and migrated to another host. This is beneficial if you have machines running mission critical workloads. NVR --- Red_Hat_Enterprise_Virtualization-Technical_Reference_Guide-3.3-en-US-3.3.0-004 Moving to ON_QA.