vSAN network issues preventing VM migration after updating ESXi hosts
Article ID: 407314
Updated On:
Products
Issue/Introduction
When hosts in a vSAN cluster are experiencing network errors, the following symptoms may arise:
- VM migration tasks and maintenance mode tasks fail
- The host may exhibit High pNIC alarms.
- VMs on the may occasionally show inaccessible from vCenter.
Environment
vSAN 7x
vSAN 8x
Cause
A high count of Receive CRC (Cyclic Redundancy Check) errors on the physical NIC used by the vSAN network.
To verify the presence of CRC errors:
- Login to the effected host using SSH.
- Run the following command: (on the vmnics used for vSAN)
esxcli network nic stats get -n vmnic#
NIC statistics for vmnic#:
Packets received: 2132792
Packets sent: 1628508
Bytes received: 4401274232
Bytes sent: 1988687858
Receive packets dropped: 0
Transmit packets dropped: 0
Multicast packets received: 162992
Broadcast packets received: 289225
Multicast packets sent: 1172
Broadcast packets sent: 79
Total receive errors: 891534
Receive length errors: 11
Receive over errors: 0
Receive CRC errors: 891523
Receive frame errors: 0
Receive FIFO errors: 0
Receive missed errors: 0
Total transmit errors: 116438
Transmit aborted errors: 0
Transmit carrier errors: 116438
Transmit FIFO errors: 0
Transmit heartbeat errors: 0
Transmit window errors: 0
Resolution
The CRC errors indicate a hardware-related issue on the network link. Contact your network hardware support vendor. See vSAN Performance Degradation Due to Physical NIC Errors for additional vmnic CRC troubleshooting.
Additional Information
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