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Data Domain: Native SQL Backups to Data Domain Fail After CIFS Timeout is Reached

Summary: The client-side session timeout resets communication with Data Domain causing backup failures.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

Back up to Data Domain Common Internet File System (CIFS) share fails with the following message due to unexpected network error:

BackupIoRequest::ReportIoError: write failure on backup device '\\device\share\Database_full_20240316015305.BAK'. Operating system error 59 (An unexpected network error occurred.).
The operating system returned the error '59(An unexpected network error occurred.)' while attempting 'DiskChangeFileSize' on '\\device\share\Database_full_20240316015305.BAK'
The operating system returned the error '59(An unexpected network error occurred.)' while attempting 'FlushFileBuffers' on '\\device\share\Database_full_20240316015305.BAK'.

Cause

The Windows Session Timeout is 60 s by default. This timeout is dependent not only on Data Domain response time, but also any network latency. If there is a slow network or longer than expected Data Domain processing (such as rapid index expansion under a heavy backup load), Windows resets the connection causing backup errors.

Resolution

Increase the Windows Session Timeout to a higher value such as 180 s by running the following command: 
Set-SmbClientConfiguration -SessionTimeout 180 -Force

Affected Products

Data Domain
Article Properties
Article Number: 000226173
Article Type: Solution
Last Modified: 20 Jun 2024
Version:  1
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