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File system backups fail with ACCESS_VIOLATION errors in the logs. Example log entries: ERROR: nbackmain - Windows structured exception ACCESS_VIOLATION in threadID 3656 ERROR: threadimpl::runthread() - Windows structured exception ACCESS_VIOLATION in threadID 8380
ACCESS_VIOLATION errors can occur due to: Avamar attempting to inflate Office XML files during backup Windows client software running an older version than the Avamar grid Antivirus software locking files during backup Other client-specific issues (such as, Hyper-V, SQL backups)
1. Disable Office XML Inflation: Create an avtar.cmd file in the " C:\Program Files\avs\var " directory. Add the following flag: --inflateofficexml=false (This prevents Avamar from decompressing Office XML files before backing them up.) 2, Update Avamar Client Software: Ensure that the Windows client version matches the latest version available on the Avamar grid Download updates from the Avamar server’s Documents and Downloads page 3. Check Antivirus Interference: Verify that antivirus scans do not overlap with scheduled backups Exclude Avamar processes or backup directories from real-time antivirus scanning if necessary 4. Escalate if the issue persists: For unresolved cases, contact Dell Support and reference this knowledge article
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