Planet Hypervisor

TripleO QuickStart HA Setup && Keeping undercloud persistent between cold reboots

This post follows up http://lxer.com/module/newswire/view/230814/index.html and might work as timer saver unless status undecloud.qcow2 per http://artifacts.ci.centos.org/artifacts/rdo/images/mitaka/delorean/stable/ requires fresh installation to be done from scratch So, we intend to survive VIRTHOST cold reboot (downtime) and keep previous version of undercloud VM been able to bring it up avoiding build via quickstart.sh and restart procedure from logging into […]

Xen Orchestra 5.0

New major release of Xen Orchestra, bringing XenServer to the Cloud!

Resetting Lost Root Password in XenServer 7.0

XenServer 7.0, Grub2, and a Lost Root Password In a previous article I detailed how one could reset a lost root password to XenServer 6.2.  While the article is not limited to 6.2 (it works just as well for 6.5, 6.1, and 6.0.2), this article is dedicated to XenServer 7.0 as grub2 has been brought in to replace extlinux. As such, if the local root user's (LRU) password for a XenServer 7.0 is forgotten physical (or "lights out") access to the host and a reboot will be required.  The contrast comes with grub2, the methods to boot the XenServer 7.0 host into single...

Xen Project 4.7 and 4.6.3 Release

I’m pleased to announce the release of Xen Project Hypervisor 4.7 and Xen Project Hypervisor 4.6.3. Xen Project Hypervisor 4.7 This new release focuses on improving code quality, security hardening, security features, live migration support, usability improvements and support for new hardware features — this is also the first release of our fixed term June […]

Dev report 4 on Xen Orchestra 5.0

Latest dev report before releasing Xen Orchestra 5.0, the best solution to manage your XenServer infrastructure!

RDO Triple0 QuickStart HA Setup on Intel Core i7-4790 Desktop (work in progress)

This post follows up https://www.linux.com/blog/rdo-triple0-quickstart-ha-setup-intel-core-i7-4790-desktop In meantime undercloud-install,undercloud-post-install (openstack undercloud install, openstack overcloud image upload ) are supposed to be performed during original run  `bash quickstart.sh –config /path-to/ha.yml $VIRTHOST` run. Neutron networks deployment on undercloud and HA Server’s configuration has been significantly rebuilt since 06/03/2016. I believe design bellow is close to proposed in https://remote-lab.net/rdo-manager-ha-openstack-deployment However […]

XenServer 7.0 performance improvements part 2: Parallelised networking datapath

The XenServer team has made a number of significant performance and scalability improvements in the XenServer 7.0 release. This is the second in a series of articles that will describe the principal improvements. For the first, see http://xenserver.org/blog/entry/dundee-tapdisk3-polling.html. The topic of this post is network I/O performance. XenServer 7.0 achieves significant performance improvements through the support for multi-queue paravirtualised network interfaces. Measurements of one particular use-case show an improvement from 17 Gb/s to 41 Gb/s. A bit of background about the PV network datapath In order to perform network-based communications, a VM employs a paravirtualised network driver (netfront in Linux or xennet in...

Xen Project Community Hosts Annual Developers Summit in August

We recently announced the program and speakers for our Xen Project Developer Summit happening in Toronto, Canada from August 25-26, 2016. The event will be co-located with LinuxCon North America. The Xen Project hypervisor powers the new needs of computing and virtualization through a rich ecosystem of community members that focus on everything from security, […]

Dev report 3 on Xen Orchestra 5.0

Xen Orchestra 5 incredible performances revealed in this dev report.

XenServer 7.0 performance improvements part 1: Lower latency storage datapath

The XenServer team made a number of significant performance and scalability improvements in the XenServer 7.0 release. This is the first in a series of articles that will describe the principal improvements. Our first topic is storage I/O performance. A performance improvement has been achieved through the adoption of a polling technique in tapdisk3, the component of XenServer responsible for handling I/O on virtual storage devices. Measurements of one particular use-case demonstrate a 50% increase in performance from 15,000 IOPS to 22,500 IOPS. What is polling? Normally, tapdisk3 operates in an event-driven manner. Here is a summary of the first few steps required...