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VMFleet · microsoft/diskspd Wiki · GitHub

VMFleet is a storage load generator to stress test hyper-converged Storage Spaces Direct (S2D) environments. The tool is specifically designed for performance analysis work and allows an analyst to inject near real-time changes into the load. Specifically, VMFleet works by utilizing a set of commands (previously scripts) to run DiskSpd in a distributed set of virtual machines (the 'fleet') and send/receive I/O requests. VMFleet is also useful for testing and validating performance on an Azure Stack hyper-converged cluster.

These instructions assume you already have a Windows Server 2019 Server Core VHD for the virtual machines.

First, install the PowerShell module from the PowerShell Gallery:

• Install-Module -Name "VMFleet"
• Import-Module VMFleet

Next, create a "Collect" volume:

• New-Volume -StoragePoolFriendlyName S2D* -FriendlyName "Collect" -FileSystem CSVFS_ReFS -Size 200GB

Create one cluster shared volume per node. To determine the appropriate CSV size you may use the Get-FleetVolumeEstimate command:

• $size = Get-FleetVolumeEstimate

Select the CSV size that fits your needs (depends on your resiliency type) and create the new volumes. Please replace the "New-Volume..." command with your desired resiliency volume creation command:

• Get-ClusterNode | ForEach-Object { New-Volume -FriendlyName <Node Volume Name> -FileSystemCSVFS_ReFS -StoragePoolFriendlyName S2D* -StorageTierFriendlyNames Mirror -StorageTierSizes $size[0].Mirror }

Set up the VMFleet directory structure within the Collect CSV. This creates four folders: Control, Flag, Result and Tools. DiskSpd.exe will come preinstalled in the Tools folder:

• Install-Fleet

Create the "fleet" of virtual machines:

• New-Fleet -BaseVhd $VhdPath -AdminPass $AdminPass -ConnectUser $NodeUser -ConnectPass $NodePassword
  • $AdminPass is the administrator password for the Server Core image. This is the password you configured for the virtual machine earlier when creating the VHD.
  • $NodeUser is a domain account with access to the cluster.
  • $NodePassword is the password for the above domain account.

Finally, you may wish to install the NuGet Package if you have not previously done so and if you plan on using the Measure-FleetCoreWorkload command. Please note that in doing so, you will temporarily set the PSGallery as a trusted repository source, relaxing the security boundary:

$repo = Get-PSRepository -Name PSGallery
if ($null -eq $repo) { Write-Host "The PSGallery is not configured on this system, please address this before continuing" }
else {
    if ($repo.InstallationPolicy -ne 'Trusted') {
        Write-Host "Setting the PSGallery repository to Trusted, original InstallationPolicy: $($repo.InstallationPolicy)"
        Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
    } 

    ### Installing the pre-requisite modules

    Install-PackageProvider NuGet -Force
    Install-Module -Name PrivateCloud.DiagnosticInfo -Force -AllowClobber -SkipPublisherCheck
    Install-Module -Name MSFT.Network.Diag -Force

    if ($repo.InstallationPolicy -ne 'Trusted') {
        Write-Host "Resetting the PSGallery repository to $($repo.InstallationPolicy)"
        Set-PSRepository -Name PSGallery -InstallationPolicy $repo.InstallationPolicy
    } 
}  

That's it! Feel free to explore the VMFleet commands below and begin your desired test.

Table 1. VMFleet module commands

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