Hyper-V Replica BPA Rules

Hyper-V Replica BPA Rules

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A frequent question from our customers is on whether there are standard “best practices” when deploying Hyper-V Replica (or any Windows Server role for that matter). These questions come in many avatars - Does the Product Group have any configuration gotchas based on internal testing, is my server properly configured, should I change any replication configuration etc.

Best Practices Analyzer (BPA) is a powerful inbox tool which scans the server for any potential ‘best practice’ violations. The report describes the problem and also provides recommendation to fix the issue. You can use the BPA both from UI as well as PowerShell.

From the Server Manager Dashboard, click on Hyper-V, scroll down to the Best Practices Analyzer option, click on Tasks, followed by Start BPA Run 


Once the scan is complete, you can filter the issues based on Warning or Errors, Excluded Results, Compliant Results.

The same can be done through PowerShell by executing the following cmdlets

Invoke-BpaModel -ModelId Microsoft/Windows/Hyper-V
Get-BpaResult -ModelId Microsoft/Windows/Hyper-V

To filter non-compliant rules, issue the following cmdlet

Get-BpaResult -ModelId Microsoft/Windows/Hyper-V -Filter Noncompliant

In a Windows Server 2012 server, the following rules constitute the Hyper-V BPA. The Hyper-V Replica specific rules are between rules 37-54.

RuleId Title
------ -----
3      The Hyper-V Virtual Machine Management Service should be configured to start automatically
4      Hyper-V should be the only enabled role
5      The Server Core installation option is recommended for servers running Hyper-V
6      Domain membership is recommended for servers running Hyper-V
7      Avoid pausing a virtual machine
8      Offer all available integration services to virtual machines
9      Storage controllers should be enabled in virtual machines to provide access to attached storage
10     Display adapters should be enabled in virtual machines to provide video capabilities
11     Run the current version of integration services in all guest operating systems
12     Enable all integration services in virtual machines
13     The number of logical processors in use must not exceed the supported maximum
14     Use RAM that provides error correction
15     The number of running or configured virtual machines must be within supported limits
16     Second-level address translation is required when running virtual machines enabled for RemoteFX
17     At least one GPU on the physical computer should support RemoteFX and meet the minimum requirements for DirectX when virtual machines are configured with a RemoteFX 3D video adapter
18     Avoid installing RemoteFX on a computer that is configured as an Active Directory domain controller
19     Use at least SMB protocol version 3.0 for file shares that store files for virtual machines.
20     Use at least SMB protocol version 3.0 configured for continuous availability on file shares that store files for virtual machines.
37     A Replica server must be configured to accept replication requests
38     Replica servers should be configured to identify specific primary servers authorized to send replication traffic
39     Compression is recommended for replication traffic
40     Configure guest operating systems for VSS-based backups to enable application-consistent snapshots for Hyper-V Replica
41     Integration services must be installed before primary or Replica virtual machines can use an alternate IP address after a failover
42     Authorization entries should have distinct tags for primary servers with virtual machines that are not part of the same security group.
43     To participate in replication, servers in failover clusters must have a Hyper-V Replica Broker configured
44     Certificate-based authentication is recommended for replication.
45     Virtual hard disks with paging files should be excluded from replication
46     Configure a policy to throttle the replication traffic on the network
47     Configure the Failover TCP/IP settings that you want the Replica virtual machine to use in the event of a failover
48     Resynchronization of replication should be scheduled for off-peak hours
49     Certificate-based authentication is configured, but the specified certificate is not installed on the Replica server or failover cluster nodes
50     Replication is paused for one or more virtual machines on this server
51     Test failover should be attempted after initial replication is complete
52     Test failovers should be carried out at least monthly to verify that failover will succeed and that virtual machine workloads will operate as expected after failover
53     VHDX-format virtual hard disks are recommended for virtual machines that have recovery history enabled in replication settings
54     Recovery snapshots should be removed after failover
55     At least one network for live migration traffic should have a link speed of at least 1 Gbps
56     All networks for live migration traffic should have a link speed of at least 1 Gbps
57     Virtual machines should be backed up at least once every week
58     Ensure sufficient physical disk space is available when virtual machines use dynamically expanding virtual hard disks
59     Ensure sufficient physical disk space is available when virtual machines use differencing virtual hard disks
60     Avoid alignment inconsistencies between virtual blocks and physical disk sectors on dynamic virtual hard disks or differencing disks
61     VHD-format dynamic virtual hard disks are not recommended for virtual machines that run server workloads in a production environment
62     Avoid using VHD-format differencing virtual hard disks on virtual machines that run server workloads in a production environment.
63     Use all virtual functions for networking when they are available
64     The number of running virtual machines configured for SR-IOV should not exceed the number of virtual functions available to the virtual machines
65     Configure virtual machines to use SR-IOV only when supported by the guest operating system
66     Ensure that the virtual function driver operates correctly when a virtual machine is configured to use SR-IOV
67     Configure the server with a sufficient amount of dynamic MAC addresses
68     More than one network adapter should be available
69     All virtual network adapters should be enabled
70     Enable all virtual network adapters configured for a virtual machine
72     Avoid using legacy network adapters when the guest operating system supports network adapters
73     Ensure that all mandatory virtual switch extensions are available
74     A team bound to a virtual switch should only have one exposed team interface
75     The team interface bound to a virtual switch should be in default mode
76     VMQ should be enabled on VMQ-capable physical network adapters bound to an external virtual switch
77     One or more network adapters should be configured as the destination for Port Mirroring
78     One or more network adapters should be configured as the source for Port Mirroring
79     PVLAN configuration on a virtual switch must be consistent
80     The WFP virtual switch extension should be enabled if it is required by third party extensions
81     A virtual SAN should be associated with a physical host bus adapter
82     Virtual machines configured with a virtual Fibre Channel adapter should be configured for high availability to the Fibre Channel-based storage
83     Avoid enabling virtual machines configured with virtual Fibre Channel adapters to allow live migrations when there are fewer paths to Fibre Channel logical units (LUNs) on the destination than on the source
106    Avoid using snapshots on a virtual machine that runs a server workload in a production environment
107    Configure a virtual machine with a SCSI controller to be able to hot plug and hot unplug storage
108    Configure SCSI controllers only when supported by the guest operating system
109    Avoid configuring virtual machines to allow unfiltered SCSI commands
110    Avoid using virtual hard disks with a sector size less than the sector size of the physical storage that stores the virtual hard disk file
111    Avoid configuring a child storage resource pool when the directory path of the child is not a subdirectory of the parent
112    Avoid mapping one storage path to multiple resource pools.


Go ahead and run the BPA, you might learn something interesting from the non-compliant rules! Fix the errors which are reported as part of the non-compliant rules and re-run the rules. The BPA scan is non-intrusive and should not impact your production workload.

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  • You did not mention if the rules list you provided is after enabling Hyper-V Replica configuration on the current server?