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Knowledge Base

Software iSCSI adapter in ESXi disappears after an upgrade (59566)

Last Updated: 10/29/2018Categories: TroubleshootingTotal Views: 10728Language:
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Symptoms

After performing an ESXi upgrade, the Software iSCSI adapter on the host disappears.

The LUNs are not detected.

Previously mounted Datastores are not discovered.

Creating a new Software iSCSI adapter fails with the error:

WARNING: Device: 1316: Failed to register device 0x430707b65050 logical#vmkernel#com.vmware.iscsi_vmk0 com.vmware.iscsi_vmk (parent=0x2b3430707b65254): Already exists

In VMkernel logs, you see entries similar to:

WARNING: Elf: 480: Fixed strtoul conversion failure
WARNING: Elf: 3017: Kernel based module load of iscsi_vmk failed: Bad parameter < ElfParseModuleParams failed >

The iSCSI module will show as enabled but not loaded.

For example:
Name            Is Loaded             Is Enabled
--------          ------------------          -----------------
iscsi_vmk            false                      true

Loading the iSCSI module manually fails with the error:

Unable to load module /usr/lib/vmware/vmkmod/iscsi_vmk: Bad parameter

Cause

This issue occurs when invalid options are specified for a iSCSI driver module. During ESX/ESXi startup, the driver module options are validated. If an invalid module option is configured, it may not be noticed until a subsequent reboot.

Resolution

Caution: Do not edit the /etc/vmware/esx.conf file configuration file directly.

To resolve this issue, validate the currently configured driver module options:

Open a console to the ESX/ESXi host.

Run this command to view a list of the options available for the driver module:

# vmkload_mod -s iscsi_vmk

Run this command to for an iSCSI driver module options and whether it is loaded on boot.

# esxcfg-module -g iscsi_vmk

You can also use esxcli command to achieve the above results.

Run this command to get Software iSCSI information .

# esxcli iscsi software get

Run this command to list their parameters.

# esxcli system module parameters list -m iscsi_vmk

Using the esxcfg-module or esxcli commands, specify correct options for the iSCSI driver module or remove all module options.

To specify correct options use the below command:

# esxcli system module parameters set -m module_name -p "Parameter_to_be_set"

For example, to set lun queue depth to 255:

# esxcli system module parameters set -m iscsi_vmk -p "iscsivmk_LunQDepth=255"

To remove all module options, simply enter a null value for the option, which appears as "".

# esxcfg-module --set-options "" iscsi_vmk

or

# esxcli system module parameters set -m iscsi_vmk -p ""

Note: Ensure that there is no white space while setting parameters for any module.

Reboot the ESXi host for the changes to take effect.

Detectable by VMware SkylineTM

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Related Products:

VMware vSphere ESXi

Related Versions:

VMware vSphere ESXi 6.5

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