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Posts Tagged ‘VMkernel’

VMware: vMotion migration socket connected returned: Already disconnected

January 7th, 2013 1 comment

Today a customer told me that he couldn’t vMotion virtual machines between a few hosts, he received this warning message:

Migration to host <<unknown>> failed with error Already disconnected

An unknown error has occurred.

vMotion migration socket connected returned: Already disconnected

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Solution:

After some troubleshooting I’ve checked and tested:

– Same VMkernel (+ case sensitive) name;
– Same VLAN;
– Same subnet;
– Same default gateway;
– They configured unique ip-addresses;
– Host A can ping host B, vice versa;
– Ping is stable < 1 ms;
– But…

…reading KB1030267 I checked the MTU size, somebody configured the MTU size with a 9000 value at the Management / vMotion VMkernel..

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The 9000 value was configured (at the hosts with the vMotion problem) but not at the physical switches, after revert to default value (1500) I was able to vMotion again, problem solved

 

Result:

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sanderdaems

Sander Daems is founder and author of this blog and working as a Lead (Sr.) Consultant by UNICA ICT Solutions. Sander has over 15 years experience in IT, primary focus: virtualization and modern worksplace.

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VMware: WARNING: VFAT: 155: File_Ioctl

August 24th, 2012 3 comments

Today I was troubleshooting a disconnected vSphere 4.1 u1 host in the vCenter cluster by a customer. After connecting ILO and troubleshooting the vmkernel log I saw some errors flooding:

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WARNING: VFAT: 155: File_Ioctl
Feb 10 21:56:45 vmkernel: 2:03:12:35.935 cpu0:672979)WARNING: VFAT: NotSupported_File_Ioctl:155: File_Ioctl
Aug 15 16:30:59 vmkernel: 122:14:58:30.147 cpu7:45795719)WARNING: VFAT: 155: File_Ioctl

 

Solution:

These messages are generated by the VMware ESXi BusyBox implementation during interactions with the host’s filesystems.

These messages are informational and can be safely ignored.

This issue is resolved in ESXi 4.1 Update 2.

 

Source: VMware

sanderdaems

Sander Daems is founder and author of this blog and working as a Lead (Sr.) Consultant by UNICA ICT Solutions. Sander has over 15 years experience in IT, primary focus: virtualization and modern worksplace.

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VMware: Edit MTU settings by GUI in vSphere 5.0

July 14th, 2011 13 comments

I saw it’s possible since vSphere 5 to configure the MTU size via the VI Client, sometimes it would be handy to do this with a GUI. In vSphere 4 you configure this at the console (vicfg-vswitch –m 9000 vswitch0 & esxcfg-vmknic –l )

vSwitch MTU Advanced Properties:

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VMkernel MTU NIC settings:

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sanderdaems

Sander Daems is founder and author of this blog and working as a Lead (Sr.) Consultant by UNICA ICT Solutions. Sander has over 15 years experience in IT, primary focus: virtualization and modern worksplace.

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