We know you have questions. Here are some of the most common questions and answers that we experience every day.

If you have a question not listed below, please use our Quick Contact form on the right side of most pages.

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1 - What are the 3 formats that HA-Lizard come in?

HA-Lizard comes in 3 formats for maximum flexibility:


  1. HA-Lizard software:  Provides High Availability for Xenserver
  2. HA-Lizard and HA-iSCSI software: Provides High Availability for Xenserver utilizing local hard drive storage with manual installation
  3. HA-Lizard NoSAN Installer software: Provides High Availability for Xenserver utilizing local hard drive storage in a easy to use auto installer

2 - What is HA-Lizard

HA-Lizard is open source software available to any person or
organization that requires High Availabilty for Citrix Xenserver. We
specialize in providing high availability for 2 node pools with internal
hard drive storage, but the software can provide high availability for
multiple hosts and Storage Area Network (SAN) applications. HA-Lizard
comes in 3 formats to allow you maximum flexibility for your

3 - Where is HA-Lizard developed?

In the United States of America

4 - Is HA-Lizard Free?

Yes. HA-Lizard is free GPL open source.

5 - Do you offer support?



HA-Lizard is open source software. We provide the software as is with no warranty or included support, however you can visit our forum or submit a support email. We do monitor and respond to your enquiries.

We also provide professional services via block hour support. Please contact us for rates or download our professional services brochure and pricing..

6 - Can I donate to HA-Lizard

Yes, every donation helps us to better improve HA-Lizard and provide better support. On each webpage is a Donate button. If you have any issues with the donate option or would rather do it over the phone, please send us an email telling us how to contact you.

7 - What is iSCSI-HA?

iSCSI-HA is an add-on software component that was developed to
complement a 2-node HA-Lizard cluster. It allows users to create a
2-node high availability cluster while utilizing local storage (Hard
Drives within the server).

8 - What is noSAN?

“noSAN” or a “noSAN Cluster” the term used to define an HA-Lizard
 2-node pool which utilizes local storage. This special configuration
combines two HA-Lizard software projects. HA-Lizard + iSCSI-HA = noSAN

a 2-node virtualization cluster is not possible without a minimum of
three hosts and an external Storage Area Network (SAN). HA-Lizard’s
“noSAN” can accomplish this with just 2 hosts utilizing each of the
hosts local storage – hence no SAN is required.

9 - What is the most common HA-Lizard deployment type?

The most common use of our software is in a 2-node XenServer environment with local storage. This setup specifically addresses two issues:

1- HA in a 2 node pool is not reliably supported by XenServer- HA-Lizard was designed to provide predictable failover in a 2-node pool

2- local storage is converted to a form of internal SAN such that VMs can be moved live and restarted without any of the limitations of using DAS. This is done with our iSCSI-HA package and allows users to build 2-node pools without any external SAN while realizing the all the functionality (mainly VM agility) of a SAN environment.

Many users are implementing HA-Lizard+iSCSI-HA to realize the scenario described above. This design is well documented in a reference design and how-to that we publish on our site.

10 - Why are most installations I read about for 2-node pools?

HA-Lizard is the only reliable high availability solution for 2-node XenServer pools in the industry

11 - Is HA-Lizard only for 2-node pools?

No. HA-Lizard works with any number of hosts within a pool and provides reliable high availability in a 2-node pool.

12 - How does HA-Lizard compare to XenServer HA?


XenServer HA

Open Source



Host High Availability Support



VM Watchdog



Support for 2-node HA Pool



Configured Through XenCenter



Command Line Interface


Yes- via XE

Hardware Fencing



13 - How do I manage HA-Lizard?

High availability for the pool and each VM can be managed from within XenCenter.

Configuration parameters for HA-Lizard are managed by a CLI “ha-cfg”.

14 - How do I create an HA-Lizard noSAN Cluster?

There are two methods available for creating your noSAN cluster:

1-      Register
to download HA-Lizard’s noSAN installer. This installer will install
and configure all the necessary components and in about a minute. The
total time required to create a noSAN cluster is about 10 minutes. A
video on how to install is available on our Youtube page.

2-      Read
our reference design which provides detailed steps for manually
installing and configuring the necessary components. Although this
approach takes more time, it leaves the installer with a better
understanding of how HA-Lizard works.

15 - How can I build a 2-node high availability cluster?

There  are two methods to building the cluster:

1-      Follow
our installation video on our youtube page. The entire cluster can be
built from scratch in < 30 minutes with our automated noSAN installer

2-      Manual approach. Follow the detailed instructions provided in our reference design which is available on this website

16 - Does HA-Lizard have any dependencies?

HA-Lizard has NO software dependencies outside of what is available on a
standard XenServer installation. Meaning, NO additional packages are

If you choose to also install iSCSI-HA, then DRBD is
required for network storage replication and TGT to expose the storage
via iSCSI.

17 - Do I need to edit static configuration files to configure HA-Lizard?

No. HA-Lizard stores all of its settings in a shared pool database. A
simple command line tool can be used on any member of a pool to make
changes for the entire pool.

18 - Can I upgrade my hosts without shutting down VMs?

Yes – HA-Lizard and iSCSI-HA provide tools and functionality so that pool upgrades can be performed without any VM downtime.

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