How to fix Error 3252 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 3252 – “Failed to copy snapshot with name ‘%ls'”

Why This Error Happens

This error typically occurs during a database snapshot operation when SQL Server 2025 cannot access, read, or write to the sparse file associated with the snapshot on the underlying NTFS volume. The root cause is usually insufficient NTFS permissions for the SQL Server service account on the snapshot directory, a corrupted or locked sparse file, or a lack of available disk space on the volume hosting the snapshot. In some cases, this is also triggered by antivirus software locking the file during the copy-on-write operation.

Step-by-Step Resolution Guide

Step 1: Verify NTFS Permissions and Service Account Access

  • Navigate to the directory specified in the snapshot creation script (e.g., D:\SQLSnapshots\).
  • Right-click the folder, select Properties > Security, and ensure the SQL Server service account (e.g., NT Service\MSSQLSERVER) has Full Control.
  • Run icacls "D:\SQLSnapshots" /grant "NT SERVICE\MSSQLSERVER":(OI)(CI)F in an elevated Command Prompt to force the permission update.

Step 2: Check Disk Space and Volume Health

  • Open File Explorer and confirm the target volume has sufficient free space (snapshots require space equal to the modified pages of the source DB).
  • Run chkdsk D: /f via an elevated PowerShell terminal to repair any underlying file system corruption on the volume.
  • Restart the SQL Server (MSSQLSERVER) service via services.msc after the check completes.

Step 3: Exclude Snapshot Directories from Antivirus Scanning

  • Open Windows Security > Virus & threat protection > Manage settings.
  • Add an exclusion for the SQL Data root directory and the specific snapshot folder path to prevent file locking during the copy-on-write process.
  • Retry the CREATE DATABASE ... AS SNAPSHOT OF command once the exclusion is saved.

Step 4: Drop and Recreate the Corrupted Snapshot

  • If the specific snapshot file is already corrupted, run DROP DATABASE [Snapshot_Name]; in SQL Server Management Studio (SSMS) to clear the broken sparse file.
  • Execute the CREATE DATABASE snapshot command again, ensuring the file path does not contain restricted characters or exceed the Windows MAX_PATH limit.

Alternative or Verification Steps

  • Verify the Fix: Check the SQL Server Error Log (via EXEC sp_readerrorlog) to confirm no further 3252 errors appear after attempting a new snapshot creation.
  • Alternative Solution: If the error persists on a specific volume, attempt to create the snapshot on a different local disk volume to rule out a hardware-specific or driver-level block issue with the original disk.