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How to manually repopulate the /backup partition of the sddc-manager-utility VM with NSX and node/host backup data on VMware Cloud Foundation (56186)

Last Updated: 6/19/2018Categories: How toTotal Views: 2725Language:
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Symptoms

The /backup directory on the sddc-manager-utility VM is either empty, or missing data for specific hosts.

The /backup directory on the sddc-manager-utility VM does not contain any NSX backup data.

Workflow tasks such as "Restore Hosts" fail.

You see errors similar to the following on the sddc-manager-controller VM within the /home/vrack/vrm/logs/vrack-vrm-debug.log file:

2018-03-13 10:44:39.848 [pool-27-thread-15] ERROR [com.vmware.vrack.vrm.core.engine.SimpleWorkflowEngine] [T199SA] Exception in task: Restore Hosts for Workflow viRemoval:d44575ff-e566-48bc-bb5e-c50f6cefee6d com.vmware.vrack.vrm.core.error.EvoWorkflowException: Unable to restore image on host 192.168.100.120 <2018-03-13 10:44:39.853 [pool-27-thread-15] DEBUG [com.vmware.vrack.vrm.workflow.tasks.removal.hostrestore.RestoreHostsFromImageTask] TASK Restore Hosts, status changed FAILED

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Resolution

The only proper way to restore the /backup partition is from a backup of the utility VM as indicated within the VMware Cloud Foundation Administration guide.

This process is provided as a workaround in case there are no viable backups of the utility VM.

Workaround

For each Workload Domain containing hosts not found on the /backup partition of the sddc-manager-utility VM, perform the following (processes referenced from the VMware Cloud Foundation Administration Guide):

Decommission the affected (missing from /backup) host (As documented in the process Replace a Dead Host that Belongs to a Workload Domain).

Bring back the host using Add host (as documented in the process Adding and Replacing Hosts).

Repeat the steps above for each host until the /backup data for every host is regenerated.

For missing NSX backups:
You can repopulate the NSX /backup data using the process Back up NSX Data (Again, from the VMware Cloud Foundation Administration Guide which also references the Back Up NSX Manager Data procedure from the NSX Upgrade Guide).

Note:  The Add host process will rename each decommissioned host to the next available node name/IP address just as if it were a new host, as you are telling SDDC Manager during the Add host operation, "This is a new host".  It does not save or recognize the host was once in the rack, only that it does not currently exist in the rack.   For example:  In an 8 node deployment, you decommission R1N4.  When you Add it back again, it will become R1N8 (assuming you have not decommissioned and readded any other hosts in a rack with 8 nodes, R1N0 - R1N7 ).

Related Information

VMware Cloud Foundation Administration Guide (version 2.2):
https://docs.vmware.com/en/VMware-Cloud-Foundation/2.2/vcf-22-administering.pdf

For version 2.3:
https://docs.vmware.com/en/VMware-Cloud-Foundation/2.3/vcf-23-administering.pdf

NSX Upgrade Guide (VMware NSX for vSphere 6.3):
https://docs.vmware.com/en/VMware-NSX-for-vSphere/6.3/nsx_63_upgrade.pdf

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