Posts Tagged ‘Cluster’

Hyper-V. CSV Volumes pause states 5120‏: Workaround

April 16, 2016 6 comments


Microsoft is aware that after installing KB3126593 (MS16-014) there may be an issue that causes loss of network packets.

This may cause Cluster Shared Volumes (CSV) on the nodes Failover Clusters to going into a paused state with an event ID 5120 in the System event log what indicates “Status c000020c – STATUS_CONNECTION_DISCONNECTED”. 

You will also find that, on the node that owns the CSV volume(s), there will be an event 7031 with the source: “Service Control Manager”, which indicates “The Windows Firewall Service terminated unexpectedly”. 

Troubleshooting Cluster Shared Volume Auto-Pauses – Event 5120.

Microsoft is aware of this problem and are working on a fix. But until it is release here is what you could do to get around this issue:

Option 1: Disable the Firewall LOGGING for all profiles (domain, private, public). (just the logging, not the firewall . You don’t want to be un-protected)

1.  Start the Windows Firewall with Advanced Security management console (wf.msc)

2.  Right-click Windows Firewall with Advanced Security on Local Computer and select Properties

3.  For all profiles (Domain, Private, Public), under Logging, click Customize. Set Log Dropped Packets and Log Successful connections to NO.

Option 2. Uninstall from the systems.

I will post an update once Microsoft releases the Hotfix.

What’s New in Hyper-V vNext ? Check out at the Infrastructure Saturday event in Brisbane

November 19, 2014 1 comment

Saturday 22nd November

Infrastructure Saturday is a day long event for south east Queensland based IT Professional that work with Microsoft products. This event is an educational, informative & lively day filled with sessions about Microsoft technologies.

Location: Microsoft office, Brisbane, QLD.

Topics covered in my Session: What’s New in Hyper-V vNext?


  • New Virtual Machine Upgrade Process
  • New Integration Components installation method
  • Secure Boot for Linux
  • Distributed Storage Quality of Service (QoS)
  • Hyper-V Backup
  • Hyper-V Virtual Machine Configuration
  • Cluster OS Rolling Upgrade




Windows Server 2012 Update – released today

April 9, 2014 Leave a comment

Today is a big day with the release of Windows Server 2012 R2 Update!

Windows Server 2012 R2 Update is a cumulative update of every hotfix released for Win2012 R2 to date. This just radically simplified our set of recommended hotfixes.

New Win2012 R2 Cluster Recommended hotfixes:
1. Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014

2. CSV snapshot file is corrupted when you create some files on the live volume

Update to improve cloud service provider resiliency in Windows Server 2012

July 13, 2013 2 comments

Microsoft released an update to improve the cloud service provider in Windows 2012

Note : The KB2870270 roll-up hotfix replaces KB2848344.  This hotfix contains the fix for Trim as well as ODX.  It is no longer necessary to disable Trim or ODX with this fix applied

The following issues are also resolved with this update:

– An Windows 2012 Hyper-V Cluster that uses CSV is moved or is toggled between directed access and redirected access when the performance monitor is running. In this situation, the performance counters no longer function.

– An Windows 2012 Hyper-V Cluster and the Virtual Machines VHD files are stored on a scale-out file share and the server is under a heavy load. In this scenario, the server may crash, and you may receive a Stop error message that resembles: STOP: 0x000000C2 (parameter1, parameter2, parameter3, parameter4) – Notes: The parameters in the Stop error message vary, depending on the configuration of the computer and not all “Stop 0x000000C2” errors are caused by this issue.

– When you use the Windows thin provisioning feature on a Windows Server 2012-based computer, you experience the same I/O delays or I/O stalls that occur during the volume-unmounting process in NTF volumes.

Plus the issues that are described in the following Microsoft Knowledge Base (KB) articles are resolved:

2796995      ( ) Offloaded Data Transfers fail on a computer that is running Windows 8 or Windows Server 2012
2799728      ( ) Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster
2801054      ( ) VSS_E_SNAPSHOT_SET_IN_PROGRESS error when you try to back up a virtual machine in Windows Server 2012
2813630      (  ) Virtual machine enters a paused state or a CSV volume goes offline when you try to create a backup of the virtual machine on a Windows Server 2012-based failover cluster
2848727      ( ) “Move-SmbWitnessClient” PowerShell command fails in Windows Server 2012
For more info and to download the update :

Hyper-V Windows 2012 : High Availability and Resiliency : new enhancements

June 28, 2012 Leave a comment

There are a number of new enhancements that ensure key workloads are resilient, and protected.

Hyper-V ReplicaAsynchronous, application-consistent virtual machine replication and it does not depend on any hardware vendor. You can establish an Hyper-V Replica between 2 separated physical locations without a storage. It permits asynchronous replication of Hyper-V virtual machines between two locations for business continuity and failure recovery.

Incremental BackupsTrue differential disk backups of virtual hard disks to help ensure that the data is backed up and restored when necessary. It also reduces storage costs because it backs up only what has changed, not the entire disk.

NIC TeamingProvides increased reliability and performance for virtual machines and now does not depends on manufacturer drivers.

Hyper-V Clustering Enhancements – Unmatched scale and flexibility for virtualized infrastructures:

Unmatched Scale – Windows Server 2012 support up to 64 physical nodes and up to 4,000 virtual machines in a single cluster providing scalability and flexibility for key virtualized workloads.

Flexible Virtual Machine Guest Clustering – Provides not only iSCSI guest clustering support, including MPIO, but also enables the use of Virtual Fibre Channel adapters within the virtual machine allowing workloads access to storage area networks using fiber channel fabric. In addition, a virtual fibre channel enables IT to cluster guest operating systems over Fibre Channel providing HA for workloads within VMs and utilize the built-in Windows multi-path I/O (MPIO) for high-availability and load balancing on the storage path.  By employing MPIO and Failover Clustering together as complimentary technologies, users are able to mitigate the risk of a system outage at both the hardware and application levels.

Highly Secure Clustered Storage – Hyper-V, Failover Clustering and BitLocker now work in concert to create the ideal and secure platform for private cloud infrastructure. Windows Server 2012 Cluster disks that are encrypted using BitLocker Drive Encryption enable better physical security for deployments outside secure data centers, providing a critical safeguard for the cloud and helping protect against inadvertent data leaks

Enhanced Cluster Shared Volumes – Cluster Shared Volume 2.0 (CSV). CSV has been greatly enhanced in a number of ways. From a usability standpoint, CSV is now a core Failover Clustering feature, with simplified administration and management.  To support up to 64 nodes in a cluster, CSV has been improved in aspects of both performance and scalability. In terms of integrating with our partners, CSV has specifically been enhanced to work out of the box with storage filter drivers such as those used by: anti-virus, data protection, backup and storage replication ensuring a more seamless integration with existing investments.

3 Levels of Availability – Bringing higher availability to workloads that do not support clustering. It does this by providing a light-weight, simple solution to monitor applications running in the VMs and integrating with the host. By monitoring services and event logs inside the virtual machine, Hyper-V and Failover Clustering can detect whether the key services that a virtual machine provides are healthy and provide automatic corrective action such as restarting the virtual machine or restarting a service within the VM.  This is in addition to the already existing virtual machine failover capabilities should a host fail, or the virtual machine itself become unresponsive.

Cluster-Aware Updating – An in-box end-to-end solution for updating Windows Server 2012 Hyper-V Failover Clusters, helping customers to preview, apply, and report on updates, all with zero downtime to the virtual machines.

Virtual Machine Failover Prioritization –  Virtual machine priorities can now be configured to control the order in which specific virtual machines failover or start. This ensures higher priority virtual machines are given the resources they need and lower priority virtual machines are given resources as they are available.

Affinity (and Anti-Affinity) Virtual Machine Rules – Administrators can now configure partnered virtual machines so that at failover, the partnered machines are migrated simultaneously. For example, administrators can configure their SharePoint virtual machine and the partnered SQL Server virtual machine to always failover together to the same node. Administrators can also specify that two specific virtual machines cannot coexist on the same node in a failover scenario.

How Does VmWare compare?

Capability Windows   Server 2012 Hyper-V

VMware   ESXi 5.0

VMware   vSphere 5.0 Enterprise Plus
 Incremental   Backups




 VM   Replication



vCenter SRM

 NIC   Teaming




 Integrated   High Availability




 Guest OS   Application Monitoring




 Cluster-Aware   Updating




Failover   Prioritization




Affinity   & Anti-Affinity Rules




What are you waiting for? start today your own POC of Windows 2012 !

W2008R2 Failover Cluster : New hotfix to improve performance enables faster failover times in a SQL 2012

April 24, 2012 Leave a comment

After you enable the AlwaysOn Availability Group feature in Microsoft SQL Server 2012 on a Windows Server 2008 R2-based failover cluster, using local and remote Availability Group database replicas, the failover time to the local replica takes longer than expected.
Note This issue occurs because of inter-node communication within the cluster.

To improve the performance of the “AlwaysOn Availability Group” feature in SQL Server 2012 is available for Windows Server 2008 R2.

Important : You must restart the computer after you apply this hotfix

To download:

Windows 2008R2 – Hyper-V / Cluster. Post SP1 patches

March 12, 2012 Leave a comment

Here is the list of required and optional post Windows 2008R2 SP1 hotfixes.

Please keep in mind that it all depends on which hardware and software combinations are used:

Note:  Windows Server 2008 R2 SP1 should be installed at a minimum plus the required hotfixes.

1              Windows & Hyper-V : Required Hotfixes

Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1 for 3+ node Hyper-V clusters)

The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1

The Cluster service stops unexpectedly on a Windows Server 2008 R2 failover cluster node when you perform multiple backup operations in parallel on a cluster shared volume for Veeam backup software)

MPIO failover fails on a computer that is running Windows Server 2008 R2

The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2

Performance decreases in Windows Server 2008 R2 when the Hyper-V role is installed on a computer that uses Intel Westmere or Sandy Bridge processors (for example :  Intel Xeon 5600 series processors )

Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access. (required for Veeam backup software)

Optional Hotfixes

An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2

“0x0000009E” Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2

A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to “Offline All”

Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2

Cluster service stops when an error occurs in the registry replication process of a failover cluster in Windows Server 2008 R2 or in Windows Server 2008

“0x20001” Stop error when you start a Linux VM in Windows Server 2008 R2 SP1

A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2

Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2

New registration entries are added to the Persistent Reservation table when the physical disk resource that is associated with the CSV is taken offline on a Windows Server 2008 R2-based Failover Cluster

A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working

Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008

Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2

Microcode update for Intel processors in Windows 7 or in Windows Server 2008 R2

Corrupted VSS snapshot

FIX: The guest operating system may crash (STOP 0xd) when you perform a live migration of Hyper-V virtual machines in a Windows Server 2008 R2 environment


A BIG Thanks to Hans Vredevoort