Add Scripts/Powershell/Hyper-V/Failover Cluster/Replication Bumper.md

Scripts/Powershell/Hyper-V/Failover Cluster/Replication Bumper.md

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+**Purpose**:
+This script *bumps* any replication that has entered a paused state due to a replication error. The script will record failed attempts at restarting the replication. The logs will rotate out every 5-days.
+
+``` powershell
+# Define the directory to store the log files
+$logDir = "C:\ClusterStorage\Volume1\Scripts\Logs"
+if (-not (Test-Path $logDir)) {
+    New-Item -Path $logDir -ItemType Directory
+}
+
+# Get today's date and format it for the log file name
+$today = Get-Date -Format "yyyyMMdd"
+$logFile = Join-Path -Path $logDir -ChildPath "ReplicationLog_$today.txt"
+
+# Manually create the log file if it doesn't exist
+if (-not (Test-Path $logFile)) {
+    Write-Host "Log file does not exist. Attempting creation..."
+    try {
+        New-Item -Path $logFile -ItemType File
+        Write-Host "Log file $logFile created successfully."
+    } catch {
+        Write-Error "Failed to create log file. Error: $_"
+    }
+}
+
+# Delete log files older than 5 days
+Get-ChildItem -Path $logDir -Filter "ReplicationLog_*.txt" | Where-Object { 
+    $_.CreationTime -lt (Get-Date).AddDays(-5)
+} | Remove-Item
+
+# Get a list of all nodes in the cluster
+$clusterNodes = Get-ClusterNode
+
+# Iterate over each cluster node
+foreach ($node in $clusterNodes) {
+    try {
+        # Get VMs with Critical ReplicationHealth from the current node
+        $vmsInCriticalState = Get-VMReplication -ComputerName $node.Name | Where-Object { $_.ReplicationHealth -eq 'Critical' }
+    } catch {
+        Write-Error "Failed to retrieve VMs from Node: $($node.Name). Error: $_"
+        # Log the error and continue to the next node
+        Add-Content -Path $logFile -Value "Failed to retrieve VMs from Node: $($node.Name) at $(Get-Date)"
+        continue
+    }
+
+    foreach ($vm in $vmsInCriticalState) {
+        Write-Host "Checking VM: $($vm.Name) on Node: $($node.Name) for replication issues."
+        Write-Host "Replication State for VM: $($vm.Name) is $($vm.ReplicationState)"
+
+        # Check if the replication state is valid to resume
+        if ($vm.ReplicationState -eq 'Resynchronization required' -or $vm.ReplicationState -eq 'WaitingForStartResynchronize') {
+            Write-Warning "Replication for VM: $($vm.Name) on Node: $($node.Name) is in '$($vm.ReplicationState)' state. Skipping..."
+            # Log the VM that is in 'Resynchronization required' or 'WaitingForStartResynchronize' state
+            Add-Content -Path $logFile -Value "Replication for VM: $($vm.Name) on Node: $($node.Name) is in '$($vm.ReplicationState)' state at $(Get-Date)"
+            continue
+        }
+
+        try {
+            # Try to resume replication for the VM
+            Resume-VMReplication -VMName $vm.Name -ComputerName $node.Name
+            Write-Host "Resumed replication for VM: $($vm.Name) on Node: $($node.Name)"
+        } catch {
+            Write-Error "Failed to resume replication for VM: $($vm.Name) on Node: $($node.Name) - $_"
+            # Write the failed VM name to the log file
+            Add-Content -Path $logFile -Value "Failed to resume replication for VM: $($vm.Name) on Node: $($node.Name) at $(Get-Date)"
+        }
+    }
+}
+```