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.