ESXi host reports the error: "unsupported ioctl"

Products

• VMware vSphere ESXi

Issue/Introduction

This article provides information about unsupported ioctl warnings in a host vmkernel.log file and outlines any impact.

• Entries from vmkernel.log:

Unsupported ioctl 58
Unsupported ioctl 43
Unsupported ioctl 59
Unsupported ioctl 60

 

For vSphere 6.0:

Unsupported ioctl 61
Unsupported ioctl 62

 

For vSphere 6.5 and 6.7:

Unsupported ioctl 62
Unsupported ioctl 63

Environment

VMware vSphere ESXi 5.1
VMware vSphere ESXi 5.5
VMware vSphere ESXi 6.0
VMware vSphere ESXi 6.5
VMware vSphere ESXi 6.7

Cause

This issue occurs when certain vSCSI filters query virtual disks. Some types of disks (for example, snapshots) do not support ioctl requests and a warning appears in the vmkernel.log file.

Resolution

These warning messages are harmless and can be safely ignored.

Additional Information

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Location of ESXi log files