Tag: Hyper-V

Data Protection Manager (DPM) 2010 Beta relased

The public beta of DPM 2010 is now available, with major improvements to virtualisation support and agents for other beta technologies like SharePoint 2010 and Exchange 2010. I hope to test drive it soon. These are two features that are particularly appealing:

Item Level Recovery from host level backup: DPM 2010 Beta supports item level recovery (ILR) which allows you to do granular recovery of files and folders, volumes and virtual hard disks (VHD) from a host level backup of Hyper-V VMs to a network share or a volume on a DPM protected server.

Alternate Host Recovery: DPM 2010 Beta supports alternate location recovery (ALR) which allows you to recover a Hyper-V VM to an alternate stand-alone or clustered Hyper-V host.

And this general improvement:

You will see far fewer “Replica Inconsistent” errors and many of them will automatically get fixed by Auto-Rerun, Auto-CC (Consistency Check).

Hyper-V graphics performance is on the way… if you need a new laptop

Dell announced today that they are releasing Alienware and Studio laptops with Intel Core i7 processors. Why is this worth regurgitating? The Core i7 processors feature the Nehalem processor microarchitecture, which means that Hyper-V V2 (in Windows Server 2008 R2) can take advantage of SLAT (Second Level Address Translation). SLAT is implemented as EPT (Extended Paging Tables) in Intel technology and NPT (Nested Paging Tables) for AMD. Here’s Microsoft’s summary of the new Hyper-V support for SLAT: Continue reading “Hyper-V graphics performance is on the way… if you need a new laptop”

Hyper-V graphics performance and SharePoint 2010 development

I’ve mentioned a couple of times that I’ve built a Windows Server 2008 R2 (with Hyper-V) laptop for SharePoint development but I haven’t mentioned one of the only major gripes that I’ve not been able to solve – namely that graphics-intensive operations bring the system to a halt. This is particularly noticeable when audio is playing and you launch a new program while Hyper-V is exporting (as if you have a sonic performance metric), or (to use the Microsoft example) when pressing CTRL+ALT+DEL.

Until the other day I had always chalked this up to something about this driver (an NVIDIA GeForce 8400 M GS on a Dell XPS M1330) and the Hyper-V role or Server 2008 R2 itself (since we didn’t have this problem with the same driver on Windows 7). However, one of our technical architects got a bit more annoyed by this than me and identified that it’s a known issue for almost every graphics driver on 64-bit-capable laptops. Continue reading “Hyper-V graphics performance and SharePoint 2010 development”

Conflicting guidance on IPv6

I recently noticed that Cable Guy is saying “don’t disable IPv6“. While I broadly agree with the approach and the reasons he suggests not to, I’ve not yet seen any down-side to disabling it, and I know we aren’t using the IPv6 technologies that Cable Guy mentions. But why did I turn it off? SharePoint’s Hyper-V performance and capacity guidance suggests that performance is improved by disabling it.

“Use IPv4 as the network protocol for Hyper-V guests. During the tests, better performance was observed when IPv4 was used exclusively. IPv6 was disabled on each network card for both the Hyper-V host and its guest VMs.”

In this case, I’m going with the SharePoint guys, especially when there’s a quantified test versus a theory, especially when it simplifies troubleshooting and not everyone is IPv6-fluent yet.

Routine loss of connectivity on a Hyper-V host’s external connection

We’ve recently been piloting a laptop developer build on Windows Server 2008 R2 Release Candidate (Build 7100) with the Hyper-V role. One of the first receipients of this build complained of connectivity problems in Office Communicator once every minute or two. For as-yet undiagnosed reasons we have lengthy sign-in times for Communicator, so this loss of connectivity rendered it completely unusable. This same problem was visible in Outlook, although less disruptive since we use Cached Exchange Mode. Both Exchange and the OCS server are hosted but we also noticed the problem with interrupted file transfers so it clearly wasn’t just an internet connectivity issue. It looked like something to do with the NIC, the cable or a network device.

The network trouble was accompanied by a series of System log event errors from MVSMP:

Port ‘SWITCHPORT-SM-F277C685-E5F8-490D-8CD1-913B854FABD2-0-1′ was prevented from using MAC address ’00-15-C5-7E-EB-39’ because it is pinned to port ‘SWITCHPORT-SM-F277C6’. Continue reading “Routine loss of connectivity on a Hyper-V host’s external connection”