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VMware vSAN Knowledge Base

Comprehensive Fix & Break Reference — Official VMware / Broadcom Procedures Only

94 KB Entries 7 Phases ⚠ Break Scenarios ✓ Fix Procedures

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Total KB Entries

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Break Scenarios

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Fix Procedures

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Phases

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Python / PowerCLI / 3rd-Party

Phases

Top 10 Common Issues

Most frequent vSAN fix & break scenarios

#1 Disk Group Absent/Degraded
#2 Network Partition
#3 Objects Inaccessible
#4 Resync Stalled
#5 Host Fails to Join
#6 Stretched Cluster Witness
#7 KMS Encryption
#8 Performance Degradation
#9 Upgrade Failure
#10 Maintenance Mode Stuck
#71 Health Service Crash
#72 Orphaned Objects
#85 APD / PDL Path Failure

KB #1–10, 71–72, 85 Open Phase 1 →

Day-2 Operations

Advanced troubleshooting & operational tasks

#11 ESA NVMe Device Drop
#12 File Services Failure
#13 HCI Mesh Configuration
#14 Encryption Key Rotation
#15 Skyline Health Alerts
#16 Dedup/Compression Tuning
#17 Capacity Full Emergency
#18 vLCM Update Workflow
#19 SPBM Policy Mismatch
#20 iSCSI Target Service
#73 CLOMD Failure
#74 Support Bundle Collection
#91 Disk Group Rebuild
#93 Performance Service

KB #11–20, 73–74, 91, 93 Open Phase 2 →

DR & Data Protection

Disaster recovery, snapshots & data integrity

#21 PSOD Recovery
#22 Snapshot Sprawl
#23 Stretched Cluster Site Failure
#24 Native Snapshots (vSAN 8)
#25 Checksum / Data Integrity
#26 vCenter Recovery
#27 Host Isolation Response
#28 Proactive HA
#29 Cluster Shutdown/Startup
#30 Fault Domain Misconfig
#75 Boot Device Failure
#76 Backup (VADP/CBT)
#86 Two-Node / ROBO
#90 SRM / DR Integration

KB #21–30, 75–76, 86, 90 Open Phase 3 →

VCF Integration

VMware Cloud Foundation lifecycle & integration

#31 SDDC Manager Bring-Up
#32 Workload Domain Expansion
#33 VCF Bundle Download/Apply
#34 NSX-T Breaks vSAN
#35 Stretched Cluster in VCF
#36 vLCM Image-Based Mgmt
#37 Aria Operations Metrics
#38 Mgmt Domain vSAN Recovery
#39 HCI Mesh Cross-Domain
#40 Cert Rotation Breaks Encryption
#83 DRS + vSAN Conflicts
#84 HBA Passthrough Mode
#87 K8s / Tanzu (CNS)
#94 Host Profile / Auto Deploy

KB #31–40, 83–84, 87, 94 Open Phase 4 →

Express Storage Architecture — NVMe-native vSAN

#41 ESA vs OSA Architecture
#42 ESA NVMe Failure Recovery
#43 OSA to ESA Migration
#44 ESA RAID-5/6 Policy Design
#45 ESA Native Snapshots
#46 ESA Dedup & Compression
#47 ESA Storage Pool Imbalance
#48 ESA NVMe Firmware Updates
#49 ESA LSOM2 Crash & Recovery
#50 ESA Performance Tuning
#77 DOM Owner Unreachable

KB #41–50, 77 Open Phase 5 →

Performance & Capacity

Latency, IOPS, sizing & capacity planning

#51 Congestion / Backpressure
#52 Resync Throttle Balancing
#53 Capacity Planning & Sizing
#54 esxtop Deep Dive
#55 Write Latency (Cache Destage)
#56 Read Latency (Cache Miss)
#57 IOPS Limiting (QoS)
#58 ReadyNode Sizing
#59 Witness Resource Exhaustion
#60 TRIM/UNMAP Capacity Reclaim
#78 Component Count Limit
#79 Proactive Rebalance
#80 Max Config Limits
#89 Witness Replacement
#92 VM vs vSAN Encryption

KB #51–60, 78–80, 89, 92 Open Phase 6 →

Networking for vSAN

VMkernel, MTU, teaming, RDMA & topology

#61 VMkernel Misconfiguration
#62 MTU / Jumbo Frame Mismatch
#63 NIC Teaming & Failover
#64 Multicast → Unicast Migration
#65 Network Partition (Split Brain)
#66 vDS Migration Pitfalls
#67 RDMA / RoCE v2 Config
#68 Stretched Cluster Networking
#69 Firewall & Port Requirements
#70 25/100GbE Network Design
#81 NTP Clock Drift (CMMDS)
#82 Datastore Not Visible
#88 Data-in-Transit Encryption

KB #61–70, 81–82, 88 Open Phase 7 →

Interactive Decision Tree

Step-by-step symptom-based troubleshooting

Select symptoms to narrow down the root cause
Covers all 94 KB entries across 8 categories
Quick-path shortcuts for common scenarios
Guided navigation with breadcrumb trail

All 94 KBs Open Decision Tree →