A. Mikkelsen VMware ESX scripts, commands, tools and other nice to know things that will make your virtualization days easier!!!!

Wednesday, June 1, 2011

vSphere Client 4.1 error…

Filed under: Errors,Virtual Center — Tags: , , , , — A. Mikkelsen @ 15:37 pm

After I upgraded vSphere vCenter & Client to 4.1 258902, I been getting an error in the vSphere Client.

A internal error occured in the vSphere Client. Details: Object reference not set to an instant object.

The solution is provided by VMware.

It’s just replacing a DLL file 🙂

The error is only with version 4.1 258902 and not 4.1 Update 1.

Thursday, September 23, 2010

Guest warning after upgrade to vSphere 4.1

Filed under: Errors,Troubleshooting,vSphere (ESX),Workstation — Tags: , , , , , , , — A. Mikkelsen @ 19:04 pm

After we upgraded to vSphere 4.1, the SCSI adaptor of all our WINXP guests changed from LSI Logic Parallel  to BusLogic Parallel. This change should normally not create any warnings or problems it VMware Tools are up to date.

But after the upgrade all our WINXP guests got the following warning when powered on in the event log.

Message from esxhost01.labt.local: The guest operating system is Windows XP and you have one or more virtual SCSI devices installed in your virtual machine. Windows XP does not support the BusLogic SCSI adapter that VMware ESX currently uses for its virtual SCSI devices. Select OK to continue or Cancel to cancel. info 22-09-2010 15:55:25 VM name vpxuser
I then changed the SCSI adaptor back to LSI Logic Parallel and I now got almost the same warning.

Message from esxhost01.labt.local: The guest operating system is Windows XP and you have one or more virtual SCSI devices installed in your virtual machine. Windows XP does not support the LSI Logic SCSI adapter that VMware ESX currently uses for its virtual SCSI devices. Select OK to continue or Cancel to cancel. info 22-09-2010 15:55:25 VM name vpxuser

I contacted VMware support and they told me that it was a known “feature”/”bug” and send me the following link to suppress the waring in the Event log.

There is two ways to suppress the warning.

Through vSphere Client

  • Using the vSpher Client logon to your vCenter server.
  • Poweroff the VM.
  • Edit the VM’s settings
  • Navigate to Options > Advanced > General
  • Click Configuration Parameters
  • Add the following rows, by using Add Row
    • If you have a BusLogic Parallel SCSI adaptor
      buslogic.noDriver = "FALSE"
    • If you have a LSI Logic Parallel SCSI adaptor
    • lsilogic.noDriver = "FALSE"
  • Click OK twice to close the dialogs and save the changes.
  • PowerOn the VM

Editing the VMX file

  • Open a SSH to the host ex. using Putty
  • Navigate to the VM’s files (relpace with your own path)
    cd /vmfs/volumes/lun01/winxp01/
  • Open the config file  in your favorit editor .
    vi winxp01.vmx
  • Add the following line to the file
    • If you have a BusLogic Parallel SCSI adaptor
    • buslogic.noDriver = "FALSE"
    • If you have a LSI Logic Parallel SCSI adaptor
    • lsilogic.noDriver = "FALSE"
  • Save and close the config file.
  • PowerOn the VM

I haven’t tested if it possible to add the lines to the global config file on each host (/etc/vmware/config) for all VM’s..

I will test this next week.

Wednesday, September 22, 2010

Problems with FullScreen in vSphere 4.1

Filed under: Errors,vSphere (ESX) — Tags: , , , , , — A. Mikkelsen @ 12:54 pm

After we upgraded to vSphere 4.1 we have been expirence problems with VM’s entering FullScreen mode.

The issue is that 9/10 times a VM enter FullScreen mode, you are not able to move the mouse to the bottom part of the screen and select a program or the Start option.

VMware is aware of the bug.
They say that it is resolved  in ESX 5 (next year)  – FullScreen mode should be completely redesigned.

Until then a patch is requested from PR, but no timeframe is released.
So if you have the same problem, please file a support request with VMware to speed up the process.

Monday, November 23, 2009

Upgrading Windows 2008 from virtual HW 4 to 7 may cause problems

Just found this very interesting article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1013109 describing a problem with Windows 2008 and ESX 4 virtual hardware version 7.

In short the article states that you might have the disks go offline in a Windows 2008 VM if you

  • Upgrade virtual hardware from version 4 to 7
  • Installing a new VM with virtual hardware 7

There is two ways to get around this (taken from the VMware KB 103109)


This can be resolved by changing the SAN Automount Policy on the system. See the Microsoft article http://support.microsoft.com/kb/973834 to change the SAN Policy to online.
The SAN policy is defined within the VDS environment of the system and is represented by the following values:
  • VDS_SP_UNKNOWN = 0x0
  • VDS_SP_ONLINE = 0x1
  • VDS_SP_OFFLINE = 0x3
For more information, see http://msdn.microsoft.com/en-us/library/bb525577(VS.85).aspx.
On Windows Server 2008 Enterprise and Windows Server 2008 Datacenter, the default SAN policy is VDS_SP_OFFLINE_SHARED. On all other Windows Server 2008 editions, the default SAN policy is VDS_SP_ONLINE.
To query current SAN policy from the command line, start DISKPART and issue a SAN command:
SAN Policy : Offline Shared


Alternatively, you can set the disk to Online after the hardware version upgrade.
To set the disk to Online:
  1. Log in to your system as an Administrator.
  2. Click Computer Management > Storage > Disk Management.
  3. Right-click the disk and choose Online.

Thursday, October 29, 2009

Extend disk with snapshots – How to fix the error

Filed under: Errors,ESXi,Troubleshooting,vSphere (ESX),White Papers — Tags: , , , , — A. Mikkelsen @ 8:55 am

Yesterday I by mistake extended a disk on a VM that had snapshots.
Using vmkfstools.
Kind of like this thread (http://communities.vmware.com/thread/238035).

This resulted in the following PowerOn error:

Failed to power on Servername on Host in Cluster:

Cannot open the disk ‘/vmfs/volumes/LUN/Folder/VM.vmdk’
Reason: The parent virtual machine disk has been modified since the child was created

The server was a database server so I had no choice than to fix it.

I tried the following with no luck:

  • Reverting to snapshot didn’t help – (Don’t try this if you don’t have a good backup)
  • Shrinking the vmdk again using vmkfstools – (This has not been possible since ESX 3.0)

Then I tried to use VMware Converter to do a V2V and in the first try (all defaults) that didn’t help the VM started with a BSOD.I tried again using the Converter but this time I changed one default parameter.In the “View/Edit Options” tap, remove the check mark in “Reconfigure destination virtual machine” and click YES to the warning.Removing the reconfigure option saved my day.
The VM started and I was able to restore the latest files from backup.

Tuesday, September 29, 2009

32-bit ODBC DSN required for vSphere running on 64-bit OS and MSSQL

Filed under: Errors,Microsoft,Troubleshooting,Virtual Center — Tags: , , , , , , — A. Mikkelsen @ 10:33 am

Last week I upgraded a Virtual Center server from Win2003 & MSSQL 2000 (32-bit) to Win2008 & MSSQL 2005 (64-bit).

During the installation of vCenter it asked for a 32-bit ODBC even though all the new systems was running 64-bit.
After a some time on Google i found that Windows 64-bit also includes a 32-bit version of the ODBC.

To set up a 32-bit DSN launch the 32-bit version of the Data Source Administrator. It is located at:

Also se

Thursday, September 10, 2009

Black screen in a Windows VM or an a physical server

Filed under: Errors,Microsoft,Troubleshooting,White Papers — Tags: , , , , , — A. Mikkelsen @ 11:31 am

Over the past few months we have seen a few Windows servers with a black screen.

  • You can’t see the logon promt
  • You get a black screen when you connect with RDP

We found that the problem was caused by a change in the Windows color scheme.

The solution is to copy the color scheme from a simular Windows servers registry and add it the VM/server that has the problem using registry to connect to a remote server.

  1. On a simular windows server locate “[HKEY_USERS\.DEFAULT\Control Panel\Colors]” and export it to a file.
  2. Using the same Registry Editor connect to the remote server.
  3. Import the registry file just created or change the color scheme manually.
  4. Reboote the affected server to change the color scheme.

Default color scheme for a Windows 2003 server.
Default color scheme for a Windows XP.
Default color scheme for a Windows 2000 server.
Default color scheme for a Windows 2008 server.

Sunday, April 5, 2009

Error encountered trying to restore cpu state from file……

Filed under: Errors,Troubleshooting — Tags: , , , , — A. Mikkelsen @ 20:30 pm

Today a one of my customers encountered an error when trying to revert to an snapshot.
They recived the following error:
“error encountered trying to restore cpu state from file /vmfs/volumes/…./xxxxx.vmsn”

After a bit of googleing if came up with the problem.
The error occures when a VM with snapshots (taken when VM is PoweredOn) is migrated or moved to a host with another CPU stepping – and the VM is reverted to ine of theise snapshots.

To correct the problem you have to complete the following steps:

  • Revert to the snapshot you want to use.
  • Make sure the VM is powered off.
  • Edit the VM’s .vmx file and remove the line “checkpoint.vmstate”
  • Power on the VM
  • Delete the snapshot

If you still want a snapshot of the VM in it’s current state

  • Shutdown the VM
  • When its powered off create a new snapshot
  • Power on the VM again to start work with it

This solution has to be applied to all VM’s with snapshots taken while the VM was powered on.

Saturday, March 21, 2009

Problems uninstalling VMware Tools

To night I had problems with uninstalling VMware Tools in a VM after updating to the latest ESX release.

The uninstaller kept asking me to insert the “VMWare Tools” disk and click OK”.
In the popup window there is pull-down field labeled “Use Source” and in this field is the number one (“1”).

If I tried to browse to the the “VMware Tools.msi” it returns an error: “The file ‘X:\VMware Tools.msi’ is not a valid installation package for the product VMware Tools…”

The solution I used to get around this problem was simply:

  1. Open the registry
  2. Locate “[HKEY_CURRENT_USER\Software\Microsoft\Installer\Products\8E24D35BB278E034284D0860A513CF1E” and delete it.
    (If you don’t want to delete it, just rename it or make a backup first)
  3. Run the VMware Tools installation again.

And wola it nor works 🙂

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