Complete Live Migration of VMs with High Load

If you are using CloudStack or OpenStack the default behaviour of live migration is configured as launch & pray it will complete. This can cause – and in practice probably will cause – VMs which have a lot of dirty pages to not complete live-migration at all. [section background_repeat=”repeat” background_position=”center top” background_attachment=”static” background_scroll=”none”] This is … Read more

DLM 4.0.6 Upgrade for Ubuntu 16.04 LTS

The version 4.0.4 of dlm (Distributed Locking Manager) currently shipped with Ubuntu 16.04 LTS has a severe bug that causes fencing of a remote host initiated by other clustered components to fail. This can cause an entire cluster to be stuck waiting and/or all cluster nodes disconnecting from the cluster for no reason. This fencing … Read more