Modify the portionSize parameter in /etc/veeam/veeam.ini . A common recommendation is to double the default value (e.g., from 1GB to 2GB or 4GB).
Before implementing manual deletions, create a full backup copy to external storage as a safety measure. Use Veeam's built-in repository verification tools to validate data integrity before and after cleanup operations.
VssSnapshotTimeout : Increase this value if the overflow occurs during the initial snapshot creation phase.
These errors originate from the underlying SQL database (Express or Full) used by Veeam to track metadata. SqlDateTime Overflow
If the error is related to snapshot creation failure (0x8004230F or -2147212529): veeam backup and replication overflow error
Your backups are only as reliable as the integer size that tracks them. Go 64-bit or go home.
ERR | Overflow: Arithmetic operation resulted in an overflow. ERR | Stack: at Veeam.Backup.Core.CHnagingBlockProcessor.ProcessBlock(Int64 offset, Int32 length)
This article provides an exhaustive guide to understanding, troubleshooting, and permanently resolving the . Whether you are running Veeam 11, 12, or the latest version 12.1, this guide will help you restore your backups to a healthy state.
MaxMoverMemoryQueueSizeMb : Increase this value to grant the Data Mover more memory buffer space during massive merge operations. Modify the portionSize parameter in /etc/veeam/veeam
When facing any overflow-related error in Veeam Backup & Replication, the following systematic approach can help you diagnose the root cause quickly.
Veeam Support often recommends modifying specific registry keys to increase the default memory and data processing buffers. Open regedit on the Veeam Backup Server.
Update to the latest Cumulative Patch for your major version (e.g., Veeam V12 or V12.1+).
USE VeeamBackup; DELETE FROM dbo.Backup.ModelSessions WHERE end_time < DATEADD(day, -90, GETDATE()); DELETE FROM dbo.Backup.TaskSessions WHERE end_time < DATEADD(day, -90, GETDATE()); DELETE FROM dbo.Backup.History WHERE create_time < DATEADD(day, -90, GETDATE()); SqlDateTime Overflow If the error is related to
Wildly impossible speeds, such as several hundred thousand GBps.
Then, shrink the database:
or processing very large datasets (e.g., 12TB+ servers). The console fails to render high transfer rates, sometimes showing "wildly extravagant" speeds like hundreds of thousands of GBps. Resolution Update Infrastructure : Many arithmetic overflow bugs were resolved in Veeam v10a and later versions Console Reinstall