Windows Server 2022 — Cluster Shared Volume Enters Redirected Access Mode Unexpectedly — Fix & Prevention

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Quick Checks
3. Deep Diagnosis
4. Primary Fix
5. Verification
6. Prevention & Hardening

Symptom & Impact

CSV volumes switch to redirected mode causing sharp performance drops for clustered VMs. Live migrations and backup checkpoints take much longer or fail. Persistent redirected I/O indicates storage path instability that can escalate.

Quick Checks

Check CSV states, storage network health, and owner node conditions across all cluster members.

Get-ClusterSharedVolume
Get-ClusterNode
Get-ClusterNetwork | Select Name,State,Role
Get-StorageSubSystem

Deep Diagnosis

Investigate MPIO or HBA disruptions and cluster events indicating heartbeat or storage arbitration pressure.

Get-WinEvent -LogName 'Microsoft-Windows-FailoverClustering/Operational' -MaxEvents 200
mpclaim -s -d
Get-MSDSMGlobalDefaultLoadBalancePolicy

Primary Fix

Stabilize storage paths, correct network role assignments, and return CSVs to direct mode after root cause isolation.

Set-ClusterNetwork -Name 'CSVNet' -Role 1
Update-HostStorageCache
Get-ClusterSharedVolume | ForEach-Object { Resume-ClusterResource $_.Name }

Verification

CSV ownership and I/O mode should normalize with no recurring redirect transitions during workload peaks.

Get-ClusterSharedVolumeState
Get-ClusterSharedVolume | Select Name,State,OwnerNode
Get-WinEvent -LogName System -MaxEvents 50 | Where-Object {$_.ProviderName -match 'stor|disk'}

Prevention & Hardening

Implement path redundancy testing, firmware baselines, and cluster validation after storage maintenance windows.

Test-Cluster -Include 'Storage Spaces Direct','Inventory','Network','System Configuration'
Get-ClusterLog -UseLocalTime -Destination C:Temp