VM /ETC

Posts Tagged ‘SAN’

Move over Lefthand Networks VSA, xtravirt.com has provided a free alternative for creating a virtual iSCSI SAN. Xtravirt Virtual SAN (XVS) is a virtual machine appliance that runs on two of your ESX hosts’ local VMFS datastores to create a single, synchronized iSCSI SAN. XVS allows the creation of ESX clusters for VI3 Enterprise features without purchasing a physical shared storage solution.

“The Xtravirt Virtual SAN (XVS) appliance for VMware ESX3 Server is a free solution to provide the benefits of shared VMFS storage without the cost of a SAN – this allows the utilisation of otherwise unused local storage in the ESX server to facilitate enterprise level features such as vMotion, DRS and HA normally only available through the use of a shared storage device. All volume data is synchronously replicated between hosts, providing full fail-over capability with data integrity in the event of host, disk or appliance failure.”

XVS is the perfectly priced storage solution for the home ESX test lab, small and mediium businesses, or the small remote branch office.

To download a copy of the virtual appliance and for more about XVS go to xtravirt.com.

updated 5.24.08

Currently XVS is only configurable as a single LUN across paired ESX hosts. A third ESX hosts can use the virtual ip address for it’s SAN, but the additional host(s) would not be using their local storage as part of the synchronized SAN. Future editions will hopefully expand the storage across more than 2 ESX hosts.

Upgrading to ESX3.5 and VirtualCeter 2.5 Best Practices is a VMware KB article that lists best practice recommendations when performing the VI upgrade. As explained in the article:

This document provides additional steps which may be useful when upgrading to ESX 3.5 and VirtualCenter 2.5. It is assumed at this point that you have also read the Upgrade Guide.

Although the article contains 11 items in the list, in my opinion the last few are common steps (place the cd in the cd-rom drive of the host etc.) and not really best practices.
Regardless, review the following before performing the upgrade and follow these recommendations to minimize trouble.
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Last week’s post about Dell’s embedded hypervisor options and the Help Me Choose: Hypervisor page sparked some reader discussion about whether XenServer can be used with shared storage. The answer to that question is that it depends on which version of XenServer you order. Dell is offering either XenServer Express or XenServer Enterprise versions as embedded options. Express is a limited version and can not use shared storage while Enterprise is fully featured and capable of using a SAN.

Citrix also offers a XenServer Standard edition, but apparently that version is not an option as an embedded hypervisor when ordering Dell hardware.

updated 05.17.08 – image updated to reflect changes to Citrix’s product comparison page after this post was publihsed and to show the 4 versions of XenServer. The table below has not been updated and does not show the Premium Edition. Click on the image for a larger version.

The image in this post and the following table were copied from the Citrix XenServer v4 web page. They offer a quick overview of the differences between the 3 versions.

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One of the hands on labs I attended at VMware Partner Exchange was the Site Recovery Manager (SRM) lab. In the lab I was able to get a good understanding of the technical details of how the yet to be released product is configured. The lab then walked us through the fail over process and workflow. This post is a high level summary of what I learned. This post is not intended to be a detailed how to, but instead just a logical overview about what it will take to set up SRM.
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I ended up with a Toyota Prius as my rental car for the week in San Diego. I’ve never driven a Prius before, and honestly, I’ve never really had an interest in the car until now. Like most, I knew that the Prius uses a Hybrid Synergy Drive (HSD) engine, but I had no idea about all the cool technology built into making the car so efficient. As a matter of fact, the Prius engine technology is in some ways similar to the Distributed Resource Scheduling and Power Management features of VI3 Enterprise.

According to wikipedia’s page about the HSD: Read the rest of this entry »

I am headed to San Diego today for VMware Partner Exchange 2008. It should be another great week of learning and networking. I am looking forward most to the hands on labs for Site Recovery Manager, ESXi, Virtual Desktop Infrastructure, and Lab Manager. There is also separate technical solution tracks for beginner, intermediate, and advanced breakout sessions. The exhibit pavillion, called the VMware Experience, sounds interesting too. Quoting the event website: Read the rest of this entry »

Why is it that migrating to virtual infrastructure (VI) is most often considered to be the responsibility of the server administrators? Anyone who has already done it can tell you it involves much more than servers and hardware. Even for small companies, virtualizing servers potentially (and usually) involves networking, storage, security, and infrastructure services changes. In fact, it is often as involved and complex as moving your physical servers from one data center to another.

So why is there a perception that implementing VI is only a server team responsibility? Obviously, one reason is because on the surface it’s about installing and consolidating operating systems on server hardware. Another reason is because VMware, the source for all the interest in migrating to VI to date, has done such a great job marketing their products as just server installs. Read the rest of this entry »