Hi,
we have Windows Server 2012 standard, and SC DPM 2012 SP1 with latest updates.
When on Hyper-V host, we have several Linux / CentOS 6.3 or Ubuntu Server 12, with latest integration tools installed, virtualization is running fine.
We do not have failover clustor or shared storage.
However, when DPM agent, starts to backing up hyper-v host, all virtual machines (including windows servers on same host) stops responding, and virtual machines gets no access to disk IO
On Ubuntu console message is:
Read-error on swap-device (252:0:319496)
sd 2:0:0:0 > rejecting I/O to offline device
after backup of all virtual machines is finished everything again works.
Some things happen if you do not use DPM at all and use native Windows Server Backup ..
Also, while machine state is "Backing up.." , you can not modify and/or work with any virtual machine on this host (can not change network or any settings, shutdown virtual machines etc.) , however virtual machines are up and running inside ram and
network (ping) is working, but they do not have disk access... . Also, on Hyper-V host, it seems that access to disk (where virtual machines is placed) is not available, and in resource monitor disk usage is at maximum.
On Hyper-V 2.0 / Windows Server 2008 R2 we did not have such a problems...
Problem with this persist on all our windows servers 2012 / hyper-v hosts where there exists virtual machines...
Please help, how to properly backup, including supported linux virtual machines, without downtime.
Kind regards
-- Hrvoje Kusulja