{Delayed Write Failed} Windows was unable to save all the data (UNC/Network traffic)

So, somehow the following event is showing up in the event vwr:

  • Event ID: 50
  • Source: MRXSMB
  • Type: System
{Delayed Write Failed} Windows was unable to save all the data for the file \data\domainname.nl\~user@domainname.nl.pst.tmp. The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this file elsewhere.

Let me explain the situation. We are running an W2012R2 server which has Office 2013 installed. The office applications are published as a remote app for some users. Their personal data and business data is stored on a different server (W2008R2). Those two virtual machines/servers are running on a different host wich are both connected to the same (gigabit) switch.

Tekening1

 

As you see we are using 2 different virtual network adapters. The E1000 adapter is a older, slower network card. Upgrading the network card to a VMXNET3 adapter would be a great solution. The VMXNET3 adapter supports up to 10GB/s. Unfortunately our switch has a maximum speed of 1GB/s.. So i had to move one of the virtual machines to the same hosts as the other virtual machine is running on. This might decrease the network traffic/time/latency between two hosts and virtual machines. The traffic between the virtual machines is now all internal traffic on the same host!

See the following article for more information about E1000 and VMXNET3 network adapters:

Update:

Moving the VM’s to the same host and upgrading the network cards did not solve the issue.. We moved the .PST files from the POP3 mailboxes to the same server as our Office applications are running. They are now “local” data. .PST files on a network share/UNC path is not a good idea!

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