SQL Failover Cluster Roles Stop Due to VMware Tools Heartbeat Timeouts inside the Guest VM

Products

• VMware vCenter Server

Issue/Introduction

In a VMware vSphere environment, SQL Server Failover Cluster Instance (FCI) roles may unexpectedly stop or failover to another node. This typically occurs during specific times of the day and is accompanied by a brief period of unresponsiveness within the Guest OS.

Symptoms:

• Cluster Events: Windows Event Viewer logs Event ID 1069 for Failover Clustering, indicating a resource failure.

• VMware Logs: The vmware.log file for the affected VM shows heartbeat timeouts and RPC failures:

  vmx - GuestRpcSendTimedOut: message to toolbox timed out.
  vmx - Tools: [AppStatus] Last heartbeat value 2200432 (last received 12s ago)
  vmx - TOOLS: appName=toolbox, oldStatus=1, status=2, guestInitiated=0.
  vcpu-0 - Tools: Tools heartbeat timeout.
  vcpu-0 - Tools: Running status rpc handler: 1 => 0.
  vcpu-0 - Tools: Changing running status: 1 => 0.
  vcpu-0 - Tools: [RunningStatus] Last heartbeat value 2200432 (last received 20s ago)
  vmx - GuestRpcSendTimedOut: message to toolbox timed out.
  vmx - Guest: *** WARNING: GuestInfo collection interval longer than expected; actual=77 sec, expected=30 sec. ***

Environment

VMware vSphere ESXi 8.x

Vmware vCenter Server 8.x

Cause

The issue is triggered when the Guest OS becomes unresponsive for a duration exceeding the cluster's heartbeat threshold. Common causes include:

1. Backup Operations: Snapshot creation or deletion (snapshot "stun") causing brief I/O pauses.

2. Resource Contention: High CPU or memory usage on the ESXi host or within the VM itself.

3. Storage Latency: Underlying storage bottlenecks preventing the Guest OS from responding to VMware Tools heartbeats.

Resolution

To resolve or mitigate this issue, perform the following steps:

1. Validate Backup Schedules: Cross-reference the timestamp of the GuestRpcSendTimedOut error with your backup software logs. If they align, consider using hardware-provider snapshots or scheduling backups during lowest-traffic windows.

2. Monitor Host Performance: Check vCenter Performance charts for CPU Ready (%) or Co-Stop values during the affected period to ensure the VM is not being starved of physical resources.

3. Check Storage Latency: Review storage performance for spikes in latency that could cause the "GuestInfo collection" to delay.

4. Adjust Cluster Thresholds: If the interruptions are brief and unavoidable, increase the Windows Failover Cluster heartbeat thresholds to be more resilient to minor latencies

5. Engage OS Vendor: If no infrastructure-level bottlenecks are found, engage Microsoft Support to analyze the Guest OS for internal process hangs or driver conflicts.

Additional Information

Ensure VMware Tools is updated to the latest version compatible with ESXi 8.x. Refer Update the VMware Tools version in the ESXi host