How to fix Error 3199 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: Error 3199 – RESTORE Requires MAXTRANSFERSIZE Mismatch

Why This Error Happens

This error occurs when the backup set being restored was originally created using a specific block size or transfer size optimized for a particular media type, such as tape devices or deduplication-aware storage volumes. SQL Server 2025 enforces strict validation during the restore process to ensure the MAXTRANSFERSIZE parameter specified in the RESTORE command matches the value embedded in the backup media header. If the values do not align, the engine blocks the operation to prevent read misalignment and potential data corruption during the restore sequence.

Step-by-Step Resolution Guide

Step 1: Identify the Required Transfer Size

  • Review the exact error message text, as it explicitly states the required value (e.g., “RESTORE requires MAXTRANSFERSIZE=65536”).
  • Alternatively, run RESTORE HEADERONLY FROM DISK = 'C:\Backups\YourFile.bak' to inspect the metadata.
  • Check the SoftwareVendorId and BackupSize columns in the header output to confirm the storage block configuration used during backup.

Step 2: Modify the Restore Command Syntax

  • Open SQL Server Management Studio (SSMS) or your query tool on the Windows Server 2025 host.
  • Update your T-SQL script to explicitly include the correct parameter value identified in Step 1.
  • Example syntax:
  RESTORE DATABASE [YourDB]
  FROM DISK = 'C:\Backups\YourFile.bak'
  WITH MAXTRANSFERSIZE = 65536, BUFFERCOUNT = 50, REPLACE;
  • Ensure the BUFFERCOUNT value is adjusted proportionally to prevent “Insufficient memory” errors on systems with limited RAM.

Step 3: Verify Windows Server Storage Alignment

  • Navigate to the physical disk properties via Windows Disk Management (diskmgmt.msc) to ensure the underlying NTFS allocation unit size supports the required transfer size.
  • If using Storage Spaces Direct (S2D) on Windows Server 2025, confirm the volume’s interleave size does not conflict with the SQL Server block size.
  • Restart the SQL Server (MSSQLSERVER) service via services.msc if configuration changes were made to the storage layer.

Step 4: Re-run the Restore Operation

  • Execute the corrected RESTORE DATABASE command with the specified MAXTRANSFERSIZE.
  • Monitor the SQL Server Error Log (via SSMS Object Explorer > Management > SQL Server Logs) in real-time to catch any immediate follow-up errors regarding memory allocation.

Alternative or Verification Steps

  • Verification: Once the restore completes, run DBCC CHECKDB on the restored database to ensure no corruption occurred due to the transfer size adjustment.
  • Alternative: If the specific MAXTRANSFERSIZE causes performance degradation on Windows 11 workstations, try restoring the backup to a staging instance first, then use BACKUP DATABASE with a standard 64KB block size to create a new, compatible backup file for future use.