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44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
---
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title: WindowsHyperVReplicationWarning
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---
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## Meaning
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Hyper-V Replica reports warning health for the virtual machine `vm` for 15
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minutes. Warning health means that some replication cycles missed their
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interval, that more than a fifth of the cycles in the last hour failed, or
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that the replication is waiting for an initial copy or a resynchronization.
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The alert carries the `relationship` label and needs the `hyperv` collector
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with its `replica_vm` subcollector. [WindowsHyperVReplicationCritical](../windowshypervreplicationcritical/)
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follows when replication stops working.
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## Impact
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The replica lags behind the primary more than planned. The recovery point
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objective is at risk, and a failover would lose more changes than expected.
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## Diagnosis
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1. Inspect `windows_hyperv_replica_vm_health`, `windows_hyperv_replica_vm_state`
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and `windows_hyperv_replica_vm_replication_latency_seconds` for the
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virtual machine, and `windows_hyperv_replica_vm_average_replication_size_bytes`
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to see whether the change rate of the virtual machine has grown.
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2. On the primary host, read the statistics of the last hour:
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```powershell
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Measure-VMReplication -VMName '<vm>' | Format-List *
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Get-VMReplication -VMName '<vm>' | Format-List State, Health, LastReplicationTime, FrequencySec
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```
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3. Check the bandwidth between the hosts, the load on the replica storage,
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and whether the replication interval is too short for the change rate of
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the virtual machine.
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## Mitigation
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Relieve the bottleneck: more bandwidth, less load on the replica storage, or a
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longer replication interval through `Set-VMReplication -ReplicationFrequencySec`.
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Resume a waiting replication with `Resume-VMReplication`. Reset the statistics
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with `Reset-VMReplicationStatistics` after the fix; the health is computed
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over the last hour and takes up to an hour to return to normal.
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