Skype for Business Server – Fabric Logs Consuming Disk Space (Script)

You may notice that your Skype for Business Front End server consumes a lot of disk space and the culprit will either be:

C:\ProgramData\Windows Fabric\Log (SfB 2015)
or
C:\ProgramData\Microsoft\SF\Log (SfB 2019)

This is caused by Windows Fabric log growth and can be rectified by either:

1) Increase disk space
2) Limit how long Fabric Logs are kept (default 3 days)

This post shows how to do option 2 manually in SfB 2015: https://myhybridsetup.org/skype-for-business-2015-limit-fabric-tracing-logs-growth/

The post above is still valid for SfB 2019, except the ‘ClusterManifest.Xml.Template’ is in a slightly different path: C:\Program Files\Skype for Business Server 2019\Server\Core (Quite obvious) and the Fabric Logs have moved to: C:\ProgramData\Microsoft\SF\Log

You can implement the same fix manually, or I have a script a colleague created to do this for you.

Disclaimer: Do not run this on a prod environment without first testing yourself.

$ver = Get-CsServerVersion

# Get Fabric Template Config files
$file = “C:\Program Files\Skype for Business Server $($ver.Substring(26,4))\Server\Core\ClusterManifest.Xml.Template"

# Copy and rename files incase of issues
Copy-Item -Path $file -Destination “$($file).old"

# Replace 3days with 1 day
(Get-Content $file)|foreach {$_ -Replace 'Name="DataDeletionAgeInDays" Value="3"','Name="DataDeletionAgeInDays" Value="1"'}|out-file $file -Force

# Delete logs SfB 2015
If (test-path -Path "C:\ProgramData\Windows Fabric\Log" -ErrorAction SilentlyContinue){Get-ChildItem "C:\ProgramData\Windows Fabric\Log"-Recurse |where {$_.name -like "*.etl" -or  $_.name -like "*.blg"}|Remove-Item -Force -ErrorAction SilentlyContinue}

# Delete logs SfB 2019
elseif (Test-Path -Path "C:\ProgramData\Microsoft\SF\Log" -ErrorAction SilentlyContinue){ Get-ChildItem "C:\ProgramData\Microsoft\SF\Log" -Recurse |where {$_.name -like "*.etl" -or  $_.name -like "*.blg"}|Remove-Item -Force -ErrorAction SilentlyContinue}

Write-Host "Restart Front End Services Manually" -ForegroundColor Yellow

The script is doing a couple of things:

  • Get SfB Version to work out where ClusterManifest.xml.Template file & Fabric Logs may be (Assumes SfB has been installed on the C: drive!)
  • Take a backup of ClusterManifest.xml.Template
  • Perform a find and replace in ClusterManifest.xml.Template to set DataDeletionAgeInDays to 1 rather than 3
  • Delete all SfB 2015 Fabric Logs
  • Delete all SfB 2019 Fabric Logs
  • Prompt you to restart Front End services

When we deploy SfB, we run this script on all servers on an FE pool to keep Fabric Logs/Traces to a minimum.

WARNING – It’s not clear if this is supported by Microsoft or whether future updates/CUs overwrite ClusterManifest.Xml.Template.

2 Replies to “Skype for Business Server – Fabric Logs Consuming Disk Space (Script)”

  1. Thanks for the script!

    Should note when outputting the new Template file, it changes the original file encoding. Original file encoding is ANSI.

    To keep this, should add “-Encoding Ascii” to “-out-file” command.

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