🟠 High   ⏱ 5–30 min  Last verified: 18 May 2026
Affected versions: Windows Server 2016

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

First-time replication seed runs indefinitely and cutover plans are delayed.

Environment & Reproduction

Typical on large volume sets with undersized log disks or constrained links.

Test-SRTopology -SourceComputerName  -SourceVolumeName D: -DestinationComputerName  -DestinationVolumeName D: -DurationInMinutes 10

Root Cause Analysis

Initial block copy throughput is insufficient and retries accumulate from transient transport errors.

Quick Triage

Validate topology test output and log disk free capacity.

Get-Volume -DriveLetter L
Get-SRGroup

Step-by-Step Diagnosis

Track synchronization percentage and identify stalls tied to network saturation windows.

Get-SRPartnership | Select ReplicationStatus,NumOfBytesRemaining
Get-Counter 'PhysicalDisk(*)Disk Bytes/sec'
Illustrative mockup for windows-server-2016 — terminal_or_powershell
Initial sync progress monitoring — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Resize log volume and schedule initial seed during low-write windows.

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Set-SRGroup -Name  -LogSizeInBytes 64GB
Set-SRGroup -Name  -LogSizeInBytes 64GB
Illustrative mockup for windows-server-2016 — event_or_log_viewer
Successful initial sync completion logs — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Use pre-seeded data copy with mirror baseline before enabling replication.

Verification & Acceptance Criteria

Initial sync reaches 100% and replication transitions to continuous state.

Rollback Plan

Remove partnership and restore original non-replicated workflow if sync cannot stabilize.

Prevention & Hardening

Capacity-plan log and data volumes using measured churn rates before deployment.

Related to SMB port filtering, MTU mismatch, and path-level packet drops.

Related tutorial: View the step-by-step tutorial for Windows Server 2016.

View all Windows Server 2016 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Microsoft Learn: Test-SRTopology and initial replication deployment guidance.

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