Return
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Title
Hyper-V cluster is offline, metadata is not available and fails to add machines to protection -
Description
After adding Hyper-V cluster to core for agentless protection, metadata for nodes and agent version, is not available.
Adding machines to protection fails with the following error
Job 'Protecting '1' virtual machine(s)' failedSystem.AggregateException depth 0: One or more errors occurred. (0x80131500) ---> (Inner Exception #0 depth 0) System.InvalidCastException depth 1: Unable to cast object of type 'System.DBNull' to type 'System.String'. (0x80004002)at DatabaseClientBase.TypeConversion.ConversionProvider.at Replay.Common.DatabaseClients.HyperVVirtualMachineStateMetadata.HyperVVirtualMachineStateMetadataDatabaseClient.SelectInternal(String whereClause) +0x176 600001dat Replay.Common.DatabaseClients.HyperVVirtualMachineStateMetadata.HyperVVirtualMachineStateMetadataDatabaseClient.SelectAll() +0x1 600001cat Replay.Core.Implementation.HyperV.MetadataCaching.HyperVMetadataCachingService.InitStateMetadataDatabaseClient() +0x60 6004048at System.Lazy`1.CreateValue() +0x60 6000f21 -
Resolution
1- Stop core service
2- Open windows explorer and navigate to C:\ProgramData\AppRecovery\Databases\HyperVVirtualMachineStateMetadataCache
3- Deleted Hyper-V metadata DB file - HyperVVirtualMachineStateMetadata.db3
4- Start core service
NOTE: Depending on the Hyper-V environment size it may take a while to gather all metadata and recreate the database