Jan 102011

I stumbled across an annoying issue with the VI client and backward compatibility. I kept receiving the error “The server closed the connection. The underlying connection was closed: the connection was closed unexpectedly.”

It was also raised in this VMware community article:


I was using the 4.1 client to connect to the ESXi 4.0 server and assumed that this would be acceptable as it should be backwardly compatible. Unfortunately this is not the case. While it is not a huge issue for me to have the 2 versions installed I can imagine a larger estate with both ESXi 4.0 and ESXi 4.1 to be a little more irritating.

This is not a show stopper at all but backward compatibility is something every company should get correct.

In addition if you have already had the 4.0 VI client installed this is not an issue as it simply loads previous version without prompting.

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Aug 192010

NOTE: this is currently speculation and not yet confirmed by VMWARE.

It looks like vmware are about to pull the plug on the VCDX 3 program as of the 30th of August 2010 (thats the romour anyway). All Exams and Design Submissions must be passed and submitted by this date.

This leaves me, along with quite a few other people, with very little notice to get the exams and designs finalised and submitted.

My personal position is that I have passed the Enterprise exam but not the Design exam (failed it once). As a result I have spend hundreds of pounds on something that looks like its going to be worthless.

I have 2 main issues:

  1. Why have there not been any anouncments from vmware certification? I know people have recently taken the enterprise exam and were not informed of the pending withdrawal of VCDX3 thus anyone that thought they could take their time for the rest of the process have been caught out.
  2. Why is there no meaningful qualification at each stage of the VCDX3 process like there is with the VCDX4. I don’t really understand why there has not been an equivalent of the VCAP for stages in the VCDX3. I would not have as much of an issue with this if my VCDX3 Enterprise exam actually counted for something.

The VCDX3 process was a little painful and drawn out, but to make matters worse vmware now seem to have left a significant number of people in limbo as there is so much confusion due to no official announcement. Vmware have always been good at connumication and it puzzles me why we have ended up in this situaltion.

As the upgrade path allows anyone that has passed the design exam in VCDX3 to take the design exam in VCDX4 and skip the Administration exam.

However when I went to book my exam on the Pearson Vue website the entire exam has been removed from site. Hence I can not book the exam.

This leaves me (and others) with the very real possibility of wasting allot of time and money on a qualification that means next to nothing in the industry (re the Enterprise Exam only).

Please could you do the poll bellow so I can get an idea how many of you are effect by this:

Sorry, there are no polls available at the moment.

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Jun 172010

Someone asked me recently what are the differences between Distributed Virtual Switch and the Cisco Nexus 1000v?

As I have only used the 1000v in lab environments my highlevel knowledge was a little rusty.

This is what I found as being available in the 1000v and not the VDS:

  • With the Nexus 1000v you get a IOS interface that will allow network managers to manage the virtual network infrastructure with the same  features as they already use to manage the physical network.
  • Port profile – As that VM moves from server to server with VMotion, the port profile follows it. All security and network configurations, stay with the VM as it travels from server to server. Enabling security policies you would traditionally find in the physical servers to be applied to VMs
  • QOS (Quality Of Service)
  • Switched Port Analyser
  • Authentication.
  • And many more…

Much more on the features of the 1000v can be found http://www.cisco.com/en/US/products/ps9902/index.html

The VDS is a big step forward from the single vSwitch model with features like:

  • Central Management
  • Network Aware Vmotion
  • Private VLANS

More info on VDS: http://www.vmware.com/products/vnetwork-distributed-switch/

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Jun 112010

vSphere was updated on June 10th 2010 to Update 2.



New Features:

Guest Operating System Customization Improvements: vCenter Server now supports customization of the following guest operating systems:

  • Windows XP Professional SP2 (x64) serviced by Windows Server 2003 SP2
  • SLES 11 (x32 and x64)
  • SLES 10 SP3 (x32 and x64)
  • RHEL 5.5 Server Platform (x32 and x64)
  • RHEL 5.4 Server Platform (x32 and x64)
  • RHEL 4.8 Server Platform (x32 and 64)
  • Debian 5.0 (x32 and x64)
  • Debian 5.0 R1 (x32 and x64)
  • Debian 5.0 R2 (x32 and x64)



New features and enhancements:

  • Enablement of Fault Tolerance Functionality for Intel Xeon 56xx Series processors— vSphere 4.0 Update 1 supports the Intel Xeon 56xx Series processors without Fault Tolerance. vSphere 4.0 Update 2 enables Fault Tolerance functionality for the Intel Xeon 56xx Series processors.
  • Enablement of Fault Tolerance Functionality for Intel i3/i5 Clarkdale Series and Intel Xeon 34xx Clarkdale Series processors— vSphere 4.0 Update 1 supports the Intel i3/i5 Clarkdale Series and Intel Xeon 34xx Clarkdale Series processors without Fault Tolerance. vSphere 4.0 Update 2 enables Fault Tolerance functionality for the Intel i3/i5 Clarkdale Series and Intel Xeon 34xx Clarkdale Series processors.
  • Enablement of IOMMU Functionality for AMD Opteron 61xx and 41xx Series processors— vSphere 4.0 Update 1 supports the AMD Opteron 61xx and 41xx Series processors without input/output memory management unit (IOMMU). vSphere 4.0 Update 2 enables IOMMU functionality for the AMD Opteron 61xx and 41xx Series processors.
  • Enhancement of the esxtop/resxtop utility vSphere 4.0 Update 2 includes an enhancement of the performance monitoring utilities, esxtop and resxtop. The esxtop/resxtop utilities now provide visibility into the performance of NFS datastores in that they display the following statistics for NFS datastores: Reads/s, writes/s, MBreads/s, MBwrtn/s, cmds/s, GAVG/s(guest latency).
  • Additional Guest Operating System Support— ESX/ESXi 4.0 Update 2 adds support for Ubuntu 10.04. For a complete list of supported guest operating systems with this release, see the VMware Compatibility Guide.

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Apr 262010

I thought I would share this experience with you as I was reminded of it by reading Dave Lawrence’s (The VMguy) blog – http://vmguy.com/wordpress/index.php/archives/1343.

While working for a customer that has a medium sized VI3 environment for VDI purposes I came across a limitation. The customer used SUN VDI as there VDI software. While I am not a expert in this area I have used various VDI products in the past and have learned that they are all (at a very very high level) quite similar.

They wanted to ramp up the number of images they had to around 2500. While this has little impact to the overall resource that was available it did mean that other considerations needed to be considered. In this case it was the max on the vcenter server. In VI3 it is 2000.

This left 2 options either upgrade to vsphere that can accommodate 3000 or change the sun vdi version to 3.0 and add a second vcenter (preferably in linked mode).

My contract finished before I got to find out what they have decided to do. I know any vmware architect worth his salt would probably spot that but i though it was interesting that my customer was just plodding ahead without even considering these type of issues.

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 Posted by at 6:48 pm

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