regarding the article http://www.veeam.com/kb1680
. Could you please confirm, if I understood the process right? :
1- Veeam requests (via admion share or VIX) the VSS service to prepare for a backup (freeze the disks).
2- The VSS service freezes the disks
3- Veeam/VMware creates a snapshot (using Vcenter/ESXi)
4- Veeam/Vmware notifies the Microsoft VSS service that it can unfreeze the disks.
5- Veeam copies the data from the Vmware Snapshot
Between the steps 2 and 4, we should have less than 20 seconds, or the Exchange Writer will unfreeze the disks aborting the process.
From the article : "So, between step 2.1(when countdown begins) and step 2.3 we have only 20 seconds. If Veeam doesn't freeze the VM in timely manner, Windows VSS subsystem does it by itself
. Hence you get unfreeze error." . Shouldnt this read "Windows VSS subsystem unfreezes the disks by itself"?
This line is also listed in the solutions : "VMware snapshot takes longer than 20 seconds (hardcoded Exchange VSS Writer timeout)" .. This should be part of the cause, not the solution IMHO.