One of the promises of server virtualization is improved high availability
and more efficient disaster recovery. But according to the Enterprise
Strategy Group (ESG) to achieve these goals with virtualization requires the
modification of existing processes. It also requires looking beyond the
virtualization vendor's HA and DR products to achieve SLAs for all workloads.
Mark Bowker and Lauren Whitehouse, analysts from ESG, recently put together
an exclusive report on this topic called “Business Resilience in Virtual
Environments” that explores:
• The advantages and challenges of server virtualization for improved
• The limitations of the virtualization platform vendor's offerings for HA
• Misconceptions about common business resiliency terms such as high
availability, fault tolerance and disaster recovery
• How to use a combination of thir... (more)
Following the XenServer HA announcement, we’ve been approached with
questions like “How exactly does XenServer HA work?” and “How does
XenServer HA and everRun VM work together.” Rather than respond ourselves
we thought it would be best to point to a few fellow bloggers who have
already answered these questions.
First, here’s a good post written by Anil Madhavapeddy at Citrix discussing
how the overall architecture of XenServer HA works. Second, Scott Lowe has
put together a great summary of why Citrix and Marathon worked together to
develop XenServer HA.
If you want more detai... (more)
Analyst firm The 451 Group has just released some very interesting findings
about virtualization and availability in a recent report by Chief Analyst
John Abbott. Some of the key take-aways include:
• Virtual infrastructure can form the basis of fully automated availability
processes. Availability becomes a default property of the virtual machine.
• ‘Dial up’ levels of availability can be implemented, depending on the
requirements of specific applications or departments.
• If a system restore is required after a disaster, it’s usually much
easier and much quicker to restore a virt... (more)
There are at least three straightforward steps that best practices companies
are implementing to achieve aggressive costs savings with their server
virtualization initiatives. I'll be reviewing these three steps in more
detail, along with customer use cases, in a webinar on August 19th, "How to
Get at least 2x Greater Cost Savings from Server Virtualization." To register
for the webinar, go to: https://www1.gotomeeting.com/register/72241968
1. Expand Ratio of Virtual Machines to Physical Hosts - One of the simplest
steps companies are taking to realize larger cost savings from ser... (more)
Thanks again to those who joined us for last week’s webinar, "Windows
Server 2008 High Availability: Technology Comparison." The on-demand
recording of last week's webinar is now available to watch at your
We had a lot of good questions from our attendees during the Q&A portion of
the webinar, which are summarized below.
Q: How do you determine when to use an HA solution vs. a DR solution?
When it comes to availability vs. recovery, the most important question to
ask is what are your recovery time objectives (RTO)? What is the amount of
time your application c... (more)