Occurs during parallel disk operations while SQL Server is waiting for threads to synchronize. This happens for operations such as backup, restore, file initialization (creation and growth). Small values are acceptable. Moderate values and average waits over 50ms should be investigated.
DBAs and Developers
- Enable Perform Volume Maintenance Tasks to avoid zero-initialization for data files
- Investigate storage issues in the Windows Event Viewer
- Ensure storage drivers are up to date