3.2. Red Hat Virtualization 4.0 Batch Update 1 (ovirt-4.0.4)

This feature adds a new parameter to the VDSM config file: "discard_enable", which is false by default.

When changed to true for a specific host (in /etc/vdsm/vdsm.conf), for each disk image/snapshot that is going to be removed, that host will issue a "blkdiscard" call right before removing it in order to free the used space from the thinly-provisioned LUN that the storage domain is built on.

If the underline storage does not support discard operations, the command will fail with a log but will not break the disk/snapshot removal.

With this release, Red Hat Virtualization now supports CephFS as a POSIX storage domain.

To properly support disk hot plug and disk QoS changes for a running virtual machine, MoM is updated and now reads the IO QoS settings from metadata and sets the respective ioTune limits to a running virtual machine's disk.

Previously, the host upgrade manager in the Administration Portal only checked and applied updates for the vdsm and vdsm-cli packages. Other packages had to be updated manually using "yum update". With this release, the list of packages that the host upgrade manager checks and updates has been extended to include ioprocess, mom, libvirt-client, libvirt-daemon-config-nwfilter, libvirt-daemon-kvm, libvirt-lock-sanlock, libvirt-python, lvm2, ovirt-imageio-common, ovirt-imageio-daemon, ovirt-vmconsole, ovirt-vmconsole-host, python-ioprocess, qemu-kvm, qemu-img, sanlock, along with vdsm and vdsm-cli.

A new configuration variable called ENGINE_SSO_INSTALLED_ON_ENGINE_HOST has been added. This flag can be used to specify if the SSO service is installed on the same host as the engine or installed on a different host. If this flag is set to true, the URL and port used to access the Manager is used to redirect to the login page. If this flag is set to false, the value set in ENGINE_SSO_AUTH_URL is used to redirect user to the login page.

With this update, the default VNC graphics in Red Hat Virtualization 4.0 is VGA. Imported virtual machines with VNC/Cirrus, and originating in previous compatibility versions, are automatically upgraded to VNC/VGA. However, QXL is still the preferred default graphics, if the guest operating system supports it.

Red Hat Virtualization will drop support for export domains in future versions.