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Solucionar cuelgue aparente de una MV al borrar una snapshot desde un NFS bajo ESX ESXi 4.1

Basicamente es lo que ocurre cuando lanzamos una snapshot o cuando un software de backup como Veeam lanza un backup o replica de una maquina virtual, y al borrar la snapshot de la mv parece que se queda colgada si estamos trabajando sobre ella (tipo TS) o contra ella (tipo servidor aplicacion web)

La solucion en base a VMware es la siguiente:

Virtual machine freezes temporarily during snapshot removal on an NFS datastore in a ESX/ESXi 4.1 host

When removing the snapshot of the virtual machine residing on the NFS storage in an ESX/ESXi 4.1 host, you may experience these symptoms:

• The virtual machine appears to be in a hung state within the console view
• The virtual machine stops responding to ping requests
• The virtual machine is inaccessible via remote desktop 

Resolution

This issue may occur if you are using a backup application that utilizes Changed Block Tracking (CBT) and the ctkEnabled option for the virtual machine is set to true. The virtual machine becomes unresponsive for up to 30 seconds as NFS locks on the .ctk file are changed.


Tambien pordemos solucionarlo mediante dos parches de sistema:

This issue is resolved in ESX 4.1 patch ESX410-201104401-SG and ESXi 4.1 patch ESXi410-201104402-BG.

Bajo rendimiento en W2k8 y Win7 en VMware?

En el KB de VMware bajo el titulo "Troubleshooting SVGA drivers installed with VMware Tools on Windows 7 and Windows 2008 R2 running on ESX 4.0" encontramos la solucion para problemas de rendimiento:

This issue can occur due to the XPDM (SVGA) driver provided with VMware Tools. This is a legacy Windows driver and is not supported on Windows 7 and Windows 2008 R2 guest operating systems.

Resolution

To resolve this issue, update to ESX 4.0 Update 1. A new WDDM driver is installed with the updated VMware Tools and is compatible with Windows 7 and Windows 2008 R2.

 

If you are able to update to ESX 4.0 Update 1, but receive a black screen on the virtual machine after changing to the new driver, click Edit Settings and change the video settings to 32MB.

Workaround

To work around this issue, perform one of these options:

• Deselect the driver included with ESX 4.0, install VMware Tools and select Custom or Modify in the VMware Tools installation wizard, then d eselect the SVGA (XPDM) driver.
  
  Notes:
  • You can also remove the VMware Tools SVGA driver from the Device Manager after installing VMware Tools.
  • To install the drivers successfully, ensure that the virtual machine hardware version is 7.
    
• Ensure that VMware Tools is installed on the virtual machine. If the mouse or video performance is still poor, replace the Display Adapter default-installed driver within the virtual machine with the driver contained in the wddm_video folder. The wddm_video folder is found on the virtual machine or in vCenter Server 4.1 (for Windows 2008 R2 operating systems) in C:\Program Files\Common Files\VMware\Drivers .

1. Navigate to C:\Program Files\Common Files\VMware\Drivers and copy the driver to a location on the virtual machine ( C:\, for example).
2. Within the virtual machine, right-click Computer > Manage > Diagnostics > Device Manager, then expand the Display Adapters selection.
3. Right-click the Driver that is currently installed and choose Update Driver Software. Browse to the folder that you copied from vCenter Server, select it, then follow the wizard.
4. When the wizard completes, reboot the virtual machine..