[fedora-virt] Virtio-win Windows NIC goes offlineduringbulkcopies

[Dor Laor]

On 09/06/2011 07:40 AM, Greg Scott wrote:
> Guys, I'm replaying the sequence of events from last week and I just
> realized - the default Realtech driver also went offline before I put in
> the VirtIO NIC driver.  Here's the sequence:
>
> 1 - Start an ntbackup of everything from the physical 2003 server to the
> 2008R2 virtual machine on a RHEL libvirt host, about 230 GB.  The 2008R2
> server was using the default Realtech NIC driver.
> 2 - The 2003 ntbackup projected around 24 hours to complete the backup
> using a 1 gb switch. This felt excessive, but still doable, so I let it
> run.
> 3 - About 8 hours in - around 4AM - at roughly 100GB, the 2008R2 virtual
> machine went offline.
> 4 - Without any serious troubleshooting, I shutdown the 2008R2 VM,
> removed the Realtech NIC, and added two Virtio NICs.
> 5 - Starting up my ntbackup again, this time ntbackup projected about 8
> hours to completion.
> 6 - But the VirtIO driver on the 2008R2 system continued going offline
> at random times.  It took several occurrences of this before I realized
> that disabling and re-enabling the 2008R2 NIC temporarily cleared the
> problem - but I would have to restart ntbackup every time.
>
> When that first Realtech driver went offline, I had not characterized
> the problem yet, and realizing I did not want to use the Realtech driver
> anyway, I just took it out and put in 2 virtual NICs, both using the
> VirtIO driver instead.  That virtual machine will connect to 2 separate
> networks - that's why the 2 NICs.
>
> So that Realtech problem could have been something else, but looking
> back, I don't think so. I wonder if the VirtIO and hardware emulator
> drivers share some common code?  Or maybe there's a flow control issue
> effecting them both?

Is the virtio issue happens with Vadim's latest drivers?

>
> - Greg Scott
>
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