Hyper-V Program Manager
Yesterday I posted about my new home setup, which makes heavy use of Hyper-V Replica.
When you first setup Hyper-V Replica for a virtual machine – we copy the virtual machine configuration and storage from the primary server to the replica server. From that point on we replicate any new data that is written to the virtual machine storage – but we do not replicate any new changes to the virtual machine configuration.
Well – there are two reasons for this:
While this all makes sense, it has tripped me up a number of times. The scenario I have experienced is this:
After having this happen to me a couple of times – I have taken to using PowerShell to perform quick sanity checks on my virtual machine configurations. This is actually quite easy to do – as PowerShell allows you to target multiple physical computers with one command.
Some checks that I have done include:
Checking memory configurations:
This command will get all the details of the memory configuration from two servers:
get-vm -computername Hyper-V-1, Hyper-V-2 | select name, DynamicMemoryEnabled, MemoryStartup, MemoryMinimum, MemoryMaximum | Sort-Object name | ft
Which looks like this when it is run:
Checking startup delay:
This command shows you all the startup information:
get-vm -computername Hyper-V-1, Hyper-V-2 | select name,automaticstartaction, automaticstartdelay | Sort-Object automaticstartdelay, name
Checking MAC address configuration:
I use DHCP with MAC address reservations in my house, so it is critical that virtual machines not change their MAC address. This command shows you what MAC addresses are being used, and whether dynamic mac address generation is enabled or not:
get-vm -computername Hyper-V-1, Hyper-V-2 | Get-VMNetworkAdapter | select VMName, macaddress, DynamicMacAddressEnabled | sort-object VMName, macaddress
Great article Ben. I wasn't aware of that replication limitation.
Is there a way to replicate the VM configuration changes?
This "behavior by design" is just an excuse for not actually having an option to enable/disable configuration file sync on top of the VHDs. Let me guess, "please upgrade to Windows Server 10"?