You are currently browsing articles tagged ESX.

SR-IOV and VMware vMotion

Working together with Intel and Dell, VMware demonstrated vMotion with SR-IOV on ESX in 2009.

A recent article on a popular technology media outlet includes misinformed claims about Hyper-V Dynamic Memory advantages over VMware vSphere.

NIC Teaming Update: Hyper-V Still Cloudy as Ever

Network teaming provides load balancing and fault tolerance to your virtual infrastructure. VMware vSphere provides powerful, elegant solutions to meet the most demanding requirements. The Hyper-V platform continues to rely on unsupported legacy technologies.

Red Hat Enterprise Virtualization: Pentium II Inside!

While VMware ESX exposes the latest performance-enhancing CPU instructions to virtual machines, Red Hat Enterprise Virtualization (RHEV) takes a more conservative approach -- downgrading all CPUs to masquerade as an old Pentium II.

Dear Red Hat…

Satirical open letter to Red Hat from VMware ESX.

It’s not Hyper-V — it’s the drivers!

The majority of Windows crashes are caused by third-party device drivers. See how Hyper-V reliability is compromised due to its dependence on a general-purpose OS.

Pimp My Hypervisor

Yo Dawg! I heard you like to virtualize, but there is no truth to the rumor that Xzibit influenced the Hyper-V design.

Taking snapshots of VMware ESX 4 running in a VM

VMware ESX 4 can virtualize itself, and by using a special undocumented configuration setting it is now possible to take snapshots of virtual VMware ESX 4 systems.

Linux apps run directly on Windows with virtualization!

Microsoft has broken through numerous technological barriers, enabling Windows/Hyper-V to directly execute Linux applications.

Hyper-V More Stable, Just as Mature as VMware vSphere?

Microsoft Virtualization publishes an embarrassing guest post refuting vSphere advantages, doing more harm than good.

The Truth About Hyper-V Memory Overcommit

Learn about Microsoft's attempt to implement memory overcommit in Hyper-V.

VMware ESXi 4: SD Flash in BL460c G6

HP Blades incorporate an SD slot that can be used to easily deploy VMware ESXi from flash. Take a look.

The Truth About VM SAN Transfers

While Microsoft marketing material claims Hyper-V and SCVMM can transfer large virtual machine files and templates over a SAN, the truth is that all VM transfers are done over the network. Only VMware ESX leverages high-speed storage area networking for VM migration.

The Truth About Storage Hot Add and Remove

VMware vSphere 4 offers multiple options for expanding virtual machine storage with zero downtime, including the ability to grow a running virtual disk. Hyper-V marketing literature makes a similar claim, but is limited to simply adding another virtual disk.

vSphere Thin-Provisioned Disk Performance

A new paper published by the VMware Performance Team shows that virtual disks using vStorage Thin Provisioning perform nearly as well as fully allocated thick disks.

Layers and Layers of FUD

Microsoft stretches the truth when claiming that VMware adds an additional layer to your architecture. The fact is, Hyper-V relies on its own instance of Windows and requires more instances for running apps.

vSphere Console Stays Connected During VMotion

When an administrator is connected to an VMware ESX virtual machine remote console and that VM is migrated with VMotion to another host, the connection seamlessly migrates to the destination host. Hyper-V does not offer this capability.

IGT Part 7: Virtual VMware ESX 4 in high demand

This article is part of a series on Incoming Google Traffic (IGT). It is very clear that the VMware community loves the ability to run virtual instances of VMware ESX 4 — this has been the most popular VCritical article ever.  Take a look at these keywords that account for hundreds of searches over the […]

The VMware ESXi 4 64MB Hypervisor Challenge

While completely unsupported, it is possible to build a small 64MB flash drive that will boot and run VMware ESXi 4.

If VMware ESXi 4 is so small, why is it so big?

Although VMware ESXi 4 requires a 1GB flash device to install, the core hypervisor functionality is fully contained in less than 60MB. Most of the remaining space is for a downloadable vSphere Client or simply unused.

A very flashy hypervisor: Hyper-V Server R2

If your server OEM supports it, you might be able to get the free Hyper-V Server R2 to boot from a flash drive someday. VMware ESXi supports this feature today.

Create ESXi 4 USB flash drives with Workstation

VMware ESXi runs great from a USB flash drive and it is easy to prepare a batch of drives for your servers without leaving the comfort of your desk -- by creating them with VMware Workstation.

Wanna see a million ESX licenses?

If you have used VMware VI3 and vSphere 4, one thing you probably noticed right away is the difference in licensing.  To much applause, vSphere no longer uses a FLEXlm license server. While you transition from VI3 to vSphere you will still need to keep the license server around, though.  Fortunately vCenter Server 4 is […]

VMware vSphere 4 has a Snapshot Alarm

Snapshots have always been a powerful feature of VMware ESX — even in production deployments.  There are tons of innovative tools and scripts out there to monitor snapshots — just check out this new one from Virtu-Al. If you happen to want a simple, built-in way to monitor your snapshots in VMware vSphere 4, look […]

DHCP VMkernel port in VMware ESX 4

VMware ESX 4 allows users to select DHCP to automatically obtain an IP address for VMkernel ports -- used for VMotion, iSCSI, and NFS storage.

Pentacore CPUs in VMware ESX 4

The number of virtual CPUs in a VM on ESX 4 is not limited to power-of-two values--any integer value from 1-8 is permitted.

Lighten Up

Fear, Uncertainty, Doubt — FUD.  The expression may have started with the mainframe generation, but these days most technology pros associate the term with Microsoft tactics.  That’s why I find it more than a little humorous to see the Microsoft Virtualization Team using it on their blog right now in an attempt to defend Hyper-V’s […]

VMotion from physical ESX 4 to virtual ESX 4

In yesterday’s post I showed how VMware ESX 4 can be run as a guest OS inside a virtual machine on ESX 4. As a follow-up, here is an interesting feat that can be performed with such a configuration: migrate a running VM with VMotion from the physical ESX host to the virtual ESX host. […]

VMware ESX 4 can even virtualize itself

VMware ESX 4 can run multiple virtual instances of ESX 4 on a single physical server and even allows powering on and VMotion of nested VMs inside virtual ESX (vESX). Perfect for a small VMware vSphere test lab!

The Million Hypervisor March

Hyper-V is often downloaded to Windows Server systems that will never be used to run virtual machines. Making this an irrelevant metric for Hyper-V installed base figures.

VMware ESX 4 – use cURL to grab files

I need to quickly download an ISO image to my new VMware ESX 4 box and discovered that the cURL utility is now included — pretty handy. If you have not used cURL, it is similar to wget.  However, with no parameters cURL will spew the download to standard out — definitely not what you […]

Nice Windows VM you’ve got there…

The SVVP identifies VMware ESX releases that are supported by Microsoft. Customers are sometimes turned away unnecessarily due to lack of awareness.

Would you buy a hypervisor from these guys?

Recently, Microsoft published a questionable video dispelling numerous VMware myths.  The only problem, at least for Microsoft, is that they really didn’t do a very convincing job.  In fact, the video is so sorry that I don’t mind promoting it here on VCritical — check it out! Mythbusters Busted Gabe’s Virtual World has an excellent […]

Hypervisor Benchmarking Quiz

Question When is it okay to disregard the EULA clause on publishing hypervisor performance benchmarks? Answer Never.

SCVMM Damage Control

Yesterday I wrote a summary of the hazards of using SCVMM to manage VI3 — highlighting previously published VCritical articles as well as linking to a new series of videos on Why Choose VMware.  Looks like VMware may have hit a nerve, as the Microsoft virtualization team scrambled to issue a barrage of rebuttals. My […]

Managing VI3 with SCVMM considered harmful

Features found in VMware ESX are unnecessarily neutered when attempting to manage by using System Center Virtual Machine Manager 2008.

Hyper-V Linux Smokescreen

Hyper-V Linux guests (SUSE) do not yet have integration components or customization capabilities. Nor can you P2V a Linux system to Hyper-V.

VM Encapsulation

Encapsulation is one of the four key benefits of VMware virtual machines.  On the surface it may seem like this is a common feature across all virtualization platforms — but it’s not. If you are a VMware ESX administrator, you know that a VMware virtual machine consists of several files,  normally contained in a single […]

Yes, NIC teaming is not unsupported

Unlike Hyper-V, VMware ESX ships with complete network interface (NIC) teaming capabilities, a critical feature for hypervisors.

New VMware ESXi Management Kit

VMware recently announced the new VMware ESXi Management Kit.  If you have up to three free ESXi servers deployed and would like to manage them with vCenter Server, this is a great opportunity.  Available until April 30 for $995. The kit includes: VMware vCenter Server Foundation vCenter Agents for 3 ESXi hosts (2 CPU sockets […]

Finding thin-provisioned virtual disks with PowerShell

Even though the VI Client does not offer creation of VMs with thin-provisioned disks, they may exist. Use a PowerShell script to identify them.

Using SCVMM to attach ISO images to VMware ESX VMs

By design, System Center Virtual Machine Manager copies ISO CD/DVD images to managed hosts instead of sharing. For VMware ESX it uses SFTP. For ESXi, it fails.

MS Virtual Server VM found to perform poorly while running inside an ESX VM

I came across this forum post today where a person is trying to evaluate SCVMM and Virtual Server — all running inside an ESX VM.  Apparently, the performance is bad… Doh! At least someone responded with this helpful analogy: It’s like buying a walk-in refrigerator and then putting a smaller one inside of it.

VM Resource Management: Hyper-V versus SCVMM

Users that wish to implement Hyper-V CPU reservations and limits are forced to open another tool, Hyper-V Manager, instead of configure these with SCVMM.

Half the VM reboots on Patch Tuesday

Virtual machine snapshots are a quick way to recover from unexpected incompatibilities you may encounter when patching guest operating systems.  In fact, VMware Update Manager even provides an option to automatically snapshot a VM before applying updates and then delete the snapshot after a specified amount of time. Even if you are not using VMware […]

Snapshots that shoot back

Although the Hyper-V Manager and SCVMM allow removing snapshots from running VMs, they are not actually merged until the VM is powered off.

Thanks for all the port groups!

VMware ESX virtual machine networking is pretty straightforward.  A virtual switch (vSwitch) is created on each host by default and is associated with one or more physical NICs.  When multiple physical NICs are used, virtual machines benefit from added redundancy and load balancing by simply connecting to such a vSwitch. However, VMs don’t connect directly […]

Storage VMotion Q&A

Yesterday Chad Sakac wrote a nice article on Storage VMotion that you might want to check out. I think the Q&A format makes it easy to read. It is an amazing thing to see an entire running VM move from one storage array to another.  Hmm, makes you wonder what the smart guys in VMware […]

Let them eat cake!

When managing a virtual environment, there are two layers of patching that need to be considered.  Guest operating systems and applications inside the virtual machines need regular updates — patch Tuesday for Windows.  And the hypervisor platforms themselves, like any other software, also need to be patched. What happens to the virtual machines when the […]

VI Client SSL thumbprint cache cleanup

Duncan at Yellow Bricks has a handy post on cleaning up your VI Client cached server address list. There is a related issue with cached self-signed SSL certificate thumbprints.  When you first connect to a VirtualCenter Server or ESX host, you see a dialog box:

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