oVirt Blog

LVM Configuration the Easy Way

Now oVirt features a simple way to prevent a host from scanning and then activating logical volumes that are not required directly by the host. In particular, the solution addresses logical volumes on shared storage managed by oVirt, and logical volumes created by a guest in oVirt raw volumes. Why is a solution required? Because scanning and activating other logical volumes may cause data corruption, slow boot, and other issues.

The solution is configuring an LVM filter on each host, which allows LVM on a host to scan only the logical volumes required directly by the host. To achieve this, we have introduced a vdsm-tool command, config-lvm-filter, that will configure the host for you.

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Engine XML Brings a Smoother Flow of Data Into oVirt

on November 8, oVirt 4.2 saw the introduction of an important behind-the-scenes enhancement.

The change is associated with the exchange of information between the engine and the VDSM. It addresses the issue of multiple abstraction layers, with each layer needing to convert its input into a suitably readable format in order to report to the next layer.

This change improves data communication between the engine and Libvirt - the tool that manages platform virtualization.

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Setting up multiple networks is going to be much faster in oVirt 4.2

Assume you have an oVirt cluster with hundreds of VM networks. Now you add a new host to the cluster. In order for it to move to the Operational state, it must have all required networks attached to it. The easiest way to do it is to attach networks to a label, and then place that label on a NIC of the added host. However, if there are too many networks, Engine could fail to setup them all at once. This is caused by a slow VDSM setupNetworks call that is not able to finish within the 180 seconds long vdsTimeout of Engine.

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Introducing oVirt 4.2.0 Beta

On October 31st, the oVirt project released version 4.2.0 Beta, available for Red Hat Enterprise Linux 7.4, CentOS Linux 7.4, or similar.

Since the release of oVirt 4.2.0 Alpha a month ago, a substantial number of stabilization fixes have been introduced.

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2018 FOSDEM & DEVCONF Events - Call for Proposals

On behalf of oVirt and the Xen Project, we are excited to announce that the call for proposals is now open for the Virtualization & IaaS devroom at the upcoming FOSDEM 2018.

This year will mark FOSDEM’s 18th anniversary as one of the longest-running free and open source software developer events, attracting thousands of developers and users from all over the world. FOSDEM will take place in Brussels, Belgium, February 3 & 4, 2018.

Also coming up is DEVCOM, The 10th annual, free community conference for developers, admins, and users of free and open source Linux, JBoss technologies. DEVCONF will take place in Brno, Czech Republic, January 26-28, 2018.

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Introducing oVirt 4.2.0 Alpha

On September 28, the oVirt project released version 4.2.0 Alpha, available for Red Hat Enterprise Linux 7.4, CentOS Linux 7.4, or similar.

This pre-release version should not be used in production, and is not feature complete.

oVirt is the open source virtualization solution that provides an awesome KVM management interface for multi-node virtualization. This maintenance version is super stable and there are some nice new features.

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How VM is started

Starting up a virtual machine (VM) is not an easy task, there are a lot of things going on hidden from the plain sight and studying it alone is a challenging task. The goal of this post is to simplify the process of learning how the oVirt hypervisor works. The concept of the oVirt is illustrated in the process of starting up the VM, which covers everything from top to the bottom.

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oVirt Now Supports OVS-DPDK

DPDK (Data Plane Development Kit) provides high-performance packet processing libraries and user space drivers. Open vSwitch uses DPDK libraries to perform entirely within the user space. According to Intel ONP performance tests, using OVS with DPDK can provide a huge performance enhancement, increasing network packet throughput and reducing latency.

OVS-DPDK has been added to the oVirt Master branch as an experimental feature. The following post describes the OVS-DPDK installation and configuration procedures.

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