Troubleshooting Scenario Questions

The virtual network standard switch lacks promiscuous mode enabled.

Why wrong: Promiscuous mode affects network packet inspection, not power-on compute allocation.

Enhanced vMotion Compatibility is set to an older baseline.

Why wrong: EVC settings prevent migration or power-on only if CPU instructions mismatch, not resource reservations.

The virtual machine has too many snapshots attached to its configuration file.

Why wrong: Snapshots impact storage and performance, not CPU reservation power-on placement checks.

Setting the VM swap file location to 'Always store with virtual machine'.

Why wrong: Swap file location settings do not resolve storage lock conflicts during HA restarts.

Enabling Storage I/O Control on the datastore.

Why wrong: SIOC manages IOPS contention, not lock management during HA failover.

Configuring an anti-affinity rule for the VM disks.

Why wrong: Anti-affinity rules keep VMs on separate hosts, avoiding storage locking.

vSphere HA admission control percentage limits.

Why wrong: HA admission control reserves failover capacity, not affinity placement constraints.

Enhanced vMotion Compatibility (EVC) baselines.

Why wrong: EVC ensures CPU instruction set compatibility, not workload placement rules.

Storage I/O Control share allocations.

Why wrong: SIOC governs storage queues, not DRS cluster placement rules.

The virtual machine must be powered off for any Storage vMotion operation to succeed.

Why wrong: Storage vMotion can be performed while the VM is powered on (online migration).

The physical switch port channel must be reconfigured to trunk the new datastore LUN IDs.

Why wrong: Physical switches do not trunk LUN IDs; LUNs are block storage entities accessed via FC or iSCSI/NVMe.

The guest operating system has experienced a hardware memory error on the physical DIMM.

Why wrong: Hardware errors trigger machine check exceptions, not ballooning.

The virtual machine has exceeded its configured memory reservation limit.

Why wrong: Reservations guarantee minimum allocation, not ballooning triggers.

The virtual machine has a memory limit set lower than its active working set.

Why wrong: A memory limit restricts maximum allocation, but ballooning is driven by host pressure.

esxcli storage san fabric status

Why wrong: ESXi does not track SAN fabric zoning status via this command.

esxcli fcadapter connection get

Why wrong: This command does not exist in the ESXi command namespace.

esxcli vmfs datastore extent list

Why wrong: This lists datastore extents, not multipathing path states.

tcpdump-uw -i vmnicX -w /tmp/capture.pcap

Why wrong: While tcpdump-uw exists in older or certain contexts, pktcap-uw is the robust, modern packet capture utility recommended for ESXi.

esxcli vswitch standard trace -n vmnicX

Why wrong: This command does not exist in the ESXi command set.

esxcli network pcap start --nic vmnicX

Why wrong: esxcli does not have a 'network pcap start' namespace; packet capture is performed using pktcap-uw.

VMware Tools has failed to start inside the guest operating system.

Why wrong: VMware Tools failure prevents ballooning and guest heartbeats, but swapping is a hypervisor-driven action triggered by absolute memory shortage.

The storage array is experiencing high hardware latency.

Why wrong: While swapping causes disk I/O, the root cause is memory exhaustion, not array latency.

The virtual machine has too much physical RAM allocated, causing memory corruption.

Why wrong: Oversized memory allocation causes memory pressure, but corruption is unrelated to swapping.

SWCUR (Current swap usage)

Why wrong: SWCUR is a memory swapping metric.

MCTLSZ (Ballooned memory size)

Why wrong: MCTLSZ is a memory metric, not a CPU metric.

DAVG (Device latency)

Why wrong: DAVG is a storage latency metric.

All virtual machines on the affected site immediately power off to prevent split-brain.

Why wrong: Powering off VMs requires a complete loss of datastore availability or HA response, not merely management connectivity loss on the witness.

The vSAN cluster automatically falls back to a standard single-site cluster layout.

Why wrong: Stretched cluster topologies cannot automatically reconfigure their fault domains without manual administrator intervention.

The vSAN datastore becomes entirely read-only across all sites.

Why wrong: As long as quorum is maintained via surviving data nodes and witness data paths, the datastore remains fully read-write.

esxcli storage vmfs extent list

Why wrong: This lists VMFS extents, which applies to traditional block storage datastores, not vSAN objects.

esxcli vsan cluster get

Why wrong: This checks general cluster membership and sub-cluster status, not individual disk component performance or health.

esxcli network ip route list

Why wrong: This displays the host routing table, which is irrelevant to vSAN storage component inspection.

The virtual machine has snapshot files older than 30 days.

Why wrong: Snapshots do not block vMotion; modern vSphere supports migrating VMs with snapshots.

The virtual machine is configured with a memory limit lower than its allocated RAM.

Why wrong: Memory limits do not block vMotion migrations.

esxcli vm kernel log list

Why wrong: This command does not exist in the ESXi command namespace.

esxcli system account list

Why wrong: This lists local user accounts on the ESXi host.

esxcli network firewall get

Why wrong: This checks firewall rule statuses, not syslog forwarding configurations.

It prioritizes voice and video packets using DSCP tagging.

Why wrong: QoS tagging handles packet marking, whereas traffic shaping enforces bandwidth limits.

It mirrors port traffic to a designated analyzer VM for packet capture.

Why wrong: Port mirroring (RSPAN/ERSPAN) handles traffic duplication for analysis.

It automatically load-balances traffic across physical uplinks using IP hash.

Why wrong: Uplink teaming policies control load balancing, not traffic shaping.

Network Packet Drop Rate

Why wrong: Network Packet Drop Rate is a networking metric.

Memory Swapin Rate

Why wrong: Memory Swapin Rate tracks memory paging activity to disk, not storage array I/O latency.

CPU Ready Time

Why wrong: CPU Ready Time is a CPU scheduling metric, not a storage metric.