Watch out installing SP1 on your Hyper-V R2 cluster

Yesterday I spoke a customer who has problems after applying Windows 2008 R2 SP1 on his 5 node Hyper-V cluster. When validating  the storage on the cluster, the following error “disk with identifier “2ef8c0……” has a persistent reservation” is displayed on multiple cluster disks.

Update 27-04-2010:

The problem can occur in the following scenario:

– You configure a failover cluster that has three or more nodes that are running Windows Server 2008 R2 Service Pack 1 (SP1).
– You have cluster disks that are configured in groups other than the Available Storage group or that are used for Cluster Shared Volumes (CSV).
– These disks are online when you run the Validate SCSI Device Vital Product Data (VPD) test or the List Potential Cluster Disks storage validation test.

In this scenario, the Validate SCSI Device Vital Product Data (VPD) test fails. Additionally, you receive an error message that resembles the following:

Failed to get SCSI page 83h VPD descriptors for cluster disk <number> from <node name> status 2

The List Potential Cluster Disks storage validation test may display a warning message that resembles the following:

Disk with identifier <value> has a Persistent Reservation on it. The disk might be part of some other cluster. Removing the disk from validation set.

A hotfix (KB 2531907) is now available that addresses the Win2008 R2 service pack 1 issue with Validate on a 3+ node cluster. You can find more information and the hotfix to download at the following link:

My advice, do not install SP1 on your production Hyper-V cluster(s) till Microsoft has solution for this nasty problem!  If you experience this problem watch and report in this topic.

Topic information was found in this blog.


Homebrew / Whitelist Hyper-V R2 home server NAS

For my home lab i was looking for a home server with NAS functionality. My current Iomega IX2 (2x500GB) NAS is replaced by this server.  For this server I had the following requirements:

  • Low power consumption (24×7)
  • Low noise
  • Flexibly and room to expand with extra hard drive(s), hardware RAID and a NIC
  • Home server functionality for sharing photos, music, documents and films
  • NAS functionality with iSCSI and NFS protocol
  • FTP server
  • Hypervisor enabled
  • Backup server
  • Print server 
  • Active Directory
  • DNS server
  • Download server
  • Wake-on-LAN functionality to start other virtualization hosts

I selected the following components:


Asus E35M1-M Pro. This motherboard contains  AMD Zacate E-350 1.60 GHz Dual-Core Processor.  It has TDP (Thermal Design Power) of 18W!



  • Dual-core 1.60 GHz processor that has passive cooling.
  • Onboard AMD Radeon graphic card
  • USB 3.0
  • 5 x SATA 6Gb/s
  • 2 x DIMM, Max 8GB RAM
  • Realtek Gigabit  8111E LAN
  • 1 x PCI Express 2.0, 1 x PCI Express 2.0 x1 slot, 2 x PCI 3.0 slots
  • uATX Form Factor, 9.6 inch x 7.2 inch ( 24.4 cm x 18.3 cm )

This Motherboard has room to expand, it is possible to add extra extra hard drive(s), a RAID controller and an extra NIC. Virtualization is also supported with AMD-V feature in the CPU.


The motherboard supports two single channel DDR3 1066MHz DIMMS . The maximum memory is 8GB.


I picked 2 x 4 GB G.Skill Ripjaws (F3-10666CL9D-8GBRL ). More supported memory for this motherboard can be found in the Asus download section

Hard drives

In this set-up I used three hard-drives. As boot drive an old Samsung SP0411C 40GB SATA 150 is used.  For the data and backup storage I picked 2 Samsung EcoGreen F4EG 2TB  hard drives.


Some specifications:

  • 2TB unformatted capacity
    SATA 3Gb/s interface
  • Three platter design
  • 32MB cache
  • 5400RPM spin speed
  • Average Seek time – 8.9 ms

Great price, large space and low power consumption.

Power Supply

As Power Supply I choose the Seasonic S12II-330W ATX power supply.


Some specifications:

  • 80 PLUS
  • Efficiency up to  85%
  • Advanced ultra-low resistance, high temperature capacitors on critical 12V rail
  • Low Noise

Good quality, high efficiency (85%) and quiet power supply.


Cooler Master CM 690 II Advanced


Some specifications:

  • Tower
  • Motherboard support Micro – ATX / ATX / Mini-ITX
  • 6 x 3,5” bays
  • 4 x 2,5”bays
  • Dimension (W / H / D)  214.5 x 496 x 528.8 mm / 8.4 x 19.5 x 20.8 inch
  • Cable management

Great case with a lot of room for expanding.

Software running so far

When installing VMware ESXi it gives an error because the NIC and disk controller aren’t  supported. The solution is to install a controller and NIC that are supported or add the drivers to the VMware ESXi ISO (more information can be found here).

An easier way is to use Microsoft Hyper-V R2 because all the drivers are supported. 

The following software is installed so far:

  • Windows 2008 R2 SP1 with the AD, DNS and Hyper-V role installed
  • Windows Home Server 2011 (Vail) RC as Virtual Machine (VM) for sharing photos, documents, music and videos. I use it also to backup my work laptop and other Windows pc’s at home.
  • Starwind iSCSI SAN
  • Services for Network File System for the NFS protocol
  • FileZilla server for FTP

Power consumption

Here are some power consumption tests I did:

  • Motherboard with 8GB RAM, started in the EFI BIOS without the hard drives attached. Power consumption around 31 Watt
  • Motherboard with 8GB RAM with three hard drives attached , Windows 2008 R2 with the MS Hyper-V R2 role and one VM active. Power consumption idle around 35 Watt
  • Motherboard with 8GB RAM with three hard drives attached, Windows 2008 R2 with the MS Hyper-V R2 role and one VM active and 2 CPU cores fully loaded in Windows 2008 R2. Power consumption around 45 Watt


Don’t except that this configuration is a performance monster. The performance is not bad for a home server with a lot of flexibility, low noise and power consumption and couple of VMs running. 

Screenshot Hyper-V manager with Microsoft Windows Home Server 2011 running.



The following considerations (will increase the costs) can be made for better performance and/or lower consumption:

  • Use an SSD drive as boot hard drive for faster booting and lower power consumption.
  • Change the power supply for an higher efficiency power supply. For example a PicoPSU has an higher efficiency for lower power consumption.
  • Add an RAID card with cache on it for better disk performance. The power consumption will increase.



Create a bootable USB to install Windows 8 Server or Hyper-V Server 8

Not all servers nowadays have DVD player installed. Sometimes it is handy to boot from USB and install for example Windows Server 8. Here’s a example how to make the USB stick bootable for the following OS versions:

– Windows Server 8

– Hyper-V Server 8

– Server 2008 R2

– Hyper-V Server R2


– Need 4 GB USB memory stick or more

– Download the desired ISO and save it

Stick the USB stick on a  free USB port on your computer equipped with a Windows OS. For this example I used Windows7 as Operating System. Clear the USB stick and create a partition on it by using the following command’s:

Open the command prompt ((make sure you run the cmd prompt as administrator)


list disk "list the disk in your system including the USB"
select disk "USB number"
create partition primary
format fs=fat32 quick

Mount the ISO  and copy all the content of the desired ISO to USB stick. For mounting the ISO I used “Deamon Tools Lite”.

Now the bootable stick is ready for use.  Boot your server with the stick and your able to install Windows 8, Windows 8 Server, 2008 R2 or Hyper-V server 8.