Recently in vmware Category

In case you have a group of virtual machines which you want to run together on one cluster node (e.g. they are communicating much faster through an internal vmware host network) you may achieve this by a cluster rule.

Just click on "Edit Settings" on the cluster's context menu:


In case you're interested in Sun/Oracle Openstorage, Fiberchannel Enterprise technologies or just want to drink a glass of fine beer - drop a note.

May 19th I am at Frankfurt Int'l Airport (Sheraton Airport Hotel) and from May 20th to 30th I will be staying in Cameroon meeting friends.

For Cameroon I am interested in internet connections. Last time I set up Orange Wimax connections and I am particularly interested in Camtel and MTN's offerings.

You may contact me at +49 171 6522660.

A step-by-step instruction manual how to install RHEL 5 using a paravirtual SCSI boot device in VMware is described here:

Comments are welcome!

How storage works in VMWare ESX?

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As opposed to the Xen/Sun xVM storage virtualization is done in the ESX Kernel (the simple case where no dedicated hardware storage is reserved and defined as passthrough for the virtual machine):


Virtualization techniques and approaches

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virtualization-hypervisor-example-60.pngI began to compare some different approaches to virtualization available and to visualize them with graphical pictograms.

I am appreciating your feedback whether I achieved that goal or not.

The following articles are available so far:

  1. Why virtualization?
  2. Userspace-based virtualization (the easy way)
  3. Xen: Hypervisor-based virtualization
  4. ESX: Hypervisor-based virtualization
  5. Solaris Zones: A sharing approach
  6. Hybrid methods: KVM

ESX 4 (VMWare): SUSE Linux with paravirtual SCSI controller

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[Remark: With Redhat Enterprise Server 5 it is a little bit more difficult, creation of the initial ramdisk image is not so straightforward: Click here for the redhat howto]

works out of the box:

SCSI subsystem initialized
VMware PVSCSI driver - version
pvscsi 0000:03:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
pvscsi: found VMware PVSCSI rev 1 on bus 3:slot 0:func 0
pvscsi 0000:03:00.0: setting latency timer to 64
pvscsi: enabled MSI-X
scsi0 : VMware PVSCSI storage adapter rev A, 256 reqs (8 pages), 1024 cmps (8 pages), cmd_per_lun=64
scsi 0:0:0:0: Direct-Access     VMware   Virtual disk     1.0  PQ: 0 ANSI: 2
 sda: sda1 sda2 sda3
if you do the following steps:

vSphere 4 ESX vs Sun xVM Xen 3.4.2: Windows 2003 SP2

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I am not a Windows guy, I admit, but in our data center there are many Windows 2003 Server installations (32bit) and we are going to virtualize them.

Management's choice is VMWare vSphere 4 (ESX 4) but nevertheless I wanted to know how Sun xVM/Xen behaves compared to ESX. Forget all that nice Management tools offered by vmware, the only thing I was interested in is the performance feeling when actually using them.

The picture at the right (click on it to enlarge) shows the hardware list of the two "brothers": To the left you'll see the xVM DomU with paravirtualized disk and network drivers, to the right there's the vSphere ESX virtual machine with a paravirtualized SCSI disk device (and an IDE boot disk, you cannot boot in ESX from a paravirtualized disk).

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