VMware vSphere Knowledge Base

1

Top 10 Common Issues

Most frequent vSphere fix & break scenarios

• #1 HA Failover
• #2 DRS Imbalance
• #3 vMotion Failure
• #4 Host Disconnected
• #5 PSOD Recovery
• #6 VM Power-On Failure
• #7 vpxd Crash
• #8 Snapshot Consolidation
• #9 Maintenance Mode Stuck
• #10 Alarm Storm

KB #1–10 Open Phase 1 →

2

Day-2 Operations

Maintenance, patching & operational tasks

• #11 Certificate Expiry
• #12 vLCM Patching
• #13 Backup & Restore
• #14 Log Bundle
• #15 SSH Hardening
• #16 SSO Issues
• #17 NTP Drift
• #18 Syslog Setup
• #19 Host Profiles
• #20 Performance esxtop

KB #11–20 Open Phase 2 →

3

HA & Fault Tolerance

High availability, FDM, isolation & FT

• #21 Admission Control
• #22 Master Election
• #23 Heartbeat Datastores
• #24 FDM Agent Crash
• #25 VMCP Setup
• #26 Fault Tolerance
• #27 Network Split Brain
• #28 Proactive HA
• #29 Isolation Response
• #30 Restart Priority

KB #21–30 Open Phase 3 →

4

DRS & Resource Management

Load balancing, affinity, NUMA & EVC

• #31 Affinity Conflicts
• #32 Resource Pool Issues
• #33 DRS Threshold
• #34 EVC Mismatch
• #35 VM-Host Rules
• #36 NUMA Optimization
• #37 Memory Ballooning
• #38 Storage DRS
• #39 DRS Faults
• #40 Latency Tuning

KB #31–40 Open Phase 4 →

5

vCenter Server & PSC

VCSA, vpxd, SSO, database & backups

• #41 VCSA Disk Full
• #42 vpxd Crash
• #43 PostgreSQL Issues
• #44 STS Certificate
• #45 Content Library
• #46 PSC Convergence
• #47 VAMI Backup
• #48 Plugin Issues
• #49 Lookup Service
• #50 VC Sizing

KB #41–50 Open Phase 5 →

6

Storage — VMFS, NFS & Multipathing

Datastores, APD/PDL, iSCSI, VAAI

• #51 VMFS Unmount
• #52 APD/PDL
• #53 Multipathing PSP
• #54 NFS Issues
• #55 VMFS Heap
• #56 Storage vMotion
• #57 Thin Provisioning
• #58 iSCSI/FC HBA
• #59 VAAI Offload
• #60 SDRS Issues

KB #51–60 Open Phase 6 →

7

Networking — vDS, vSS & vMotion

Distributed switches, teaming, MTU, NIOC

• #61 vDS Disconnect
• #62 vMotion Network
• #63 MTU Mismatch
• #64 NIC Teaming
• #65 VLAN Config
• #66 vSS to vDS
• #67 NIOC
• #68 TCP/IP Stacks
• #69 Firewall Ports
• #70 SR-IOV

KB #61–70 Open Phase 7 →

8

Advanced Features & Extended Platform

vSphere+, Encryption, vGPU, Tanzu, Replication, Skyline

• #71 vSphere+ Cloud Gateway
• #72 VM Encryption & vTPM
• #73 vGPU & DirectPath I/O
• #74 Auto Deploy
• #75 vLCM Image-Based
• #76 vSphere Replication
• #77 Tanzu / Workload Mgmt
• #78 Enhanced Linked Mode
• #79 Coredump & Crashdump
• #80 Skyline Health

KB #71–80 Open Phase 8 →

⚙

Interactive Decision Tree

Step-by-step symptom-based troubleshooting

• Select symptoms to narrow down the root cause
• Covers all 80 KB entries across 8 categories

All 80 KBs Open Decision Tree →