ESXi host reports the error: "unsupported ioctl"
search cancel

ESXi host reports the error: "unsupported ioctl"


Article ID: 324961


Updated On:


VMware vSphere ESXi


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

  • The vmkernel.log file on an ESXi host contains one of these or similar entries:
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


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


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.


These warning messages are harmless and can be safely ignored.

Additional Information

To be alerted when this document is updated, click the Subscribe to Article link in the Actions box.
Location of ESXi 3.5-4.1 log files
How to file a Support Request in Customer Connect
Location of ESXi 5.1 and 5.5 log files
ESXi ホストがunsupported ioctlエラーを表示
ESXi 主机报告错误:ioctl 不受支持