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Introduction

  • Issue: Commvault is not removing GX_BACKUP snapshots after backing up VMware cluster VMs.

  • Common Cause: The issue often lies with VMware's snapshot consolidation process, which may fail or hang.

  • Version Compatibility: Ensure that the CommServe, Media Agent, and VSA clients are all running the same version of Commvault software.

  • Manual Cleanup: Use the CVVMwareSnapshotUtil utility to manually remove snapshots.

  • Event Logs: Check the events on the job and the VM in vCenter for more information on why the snapshot removal failed.

  • Snapshot Consolidation: Sometimes snapshots are logically removed but fail to consolidate, requiring manual intervention.

  • VMware KB: Refer to VMware KB article 2017072 for troubleshooting snapshot consolidation errors.

Common Causes [1]

  • Snapshot Consolidation: Often, the issue is with VMware's snapshot consolidation process failing or hanging.

  • VMware Response: Commvault sends the request to VMware, but VMware may not process it correctly.

  • Infrastructure Issues: Problems with the vCenter or ESX host can cause snapshot removal failures.

  • Large VMs: Larger VMs may take longer to consolidate snapshots, leading to potential issues.

  • Network Issues: Network problems between the VSA proxy and the vCenter can also cause failures.

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Version Compatibility [1]

  • Ensure Same Version: Make sure the CommServe, Media Agent, and VSA clients are all running the same version of Commvault software.

  • Upgrade Guide: Refer to the CommCell Environment Upgrades documentation for help on upgrading your CommCell.

  • VDDK Bugs: Older versions of the VDDK (VMware's software framework used by Commvault) may have bugs causing snapshot issues.

  • Maintenance Releases: Consider running the latest maintenance release, such as FR20 or FR24.

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Manual Cleanup [2]

  • Utility: Use the CVVMwareSnapshotUtil utility to manually remove snapshots.

  • Location: The utility is available in the C:\Program Files\Commvault\ContentStore\Base folder on Windows VSA proxy machines.

  • Command: Run the utility with administrator privileges from the command line.

  • Options: Use options like -allVMs, -snapMoref, -snapName, -remove, -removeAll, and -removeOld to specify the snapshots to remove.

  • Examples: Commands to remove specific snapshots or all snapshots older than a specified number of hours are provided in the documentation.

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Event Logs [1]

  • Job Events: Check the events on the job in Commvault for more information on why the snapshot removal failed.

  • VM Events: Also check the tasks and events on the VM in vCenter where the snapshot remains.

  • Event ID: Look for specific event IDs related to snapshot removal failures.

  • Error List: Commvault has a list of event errors related to snapshots that can be referenced.

  • Daily Reports: Consider running daily reports to generate a list of VMs with snapshot removal issues and forward them to the VMware admin.

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Snapshot Consolidation [1]

  • Logical Removal: Sometimes snapshots are logically removed but fail to consolidate, requiring manual intervention.

  • Background Process: Snapshot consolidation is a background process that can take several hours for large VMs.

  • Manual Cleanup: Unconsolidated snapshots may need to be manually cleaned up if consolidation fails.

  • VMware KB: Refer to VMware KB article 2017072 for troubleshooting snapshot consolidation errors.

  • VDDK Bugs: Older versions of the VDDK may have bugs causing snapshot consolidation issues.

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VMware KB [1]

  • KB Article: Refer to VMware KB article 2017072 for troubleshooting snapshot consolidation errors.

  • Consolidation Errors: The article provides steps to resolve snapshot consolidation errors in VMware.

  • Manual Steps: Follow the manual steps outlined in the KB article to fix consolidation issues.

  • VMware Support: Contact VMware support if the issue persists after following the KB article.

  • Commvault Support: Also consider reaching out to Commvault support for additional assistance.

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