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Posts Tagged ‘vMotion’

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: The checkpoint data length (16384 bytes) or the offset (16776528 bytes) exceeds the maximum checkpoint data length

April 13th, 2012 1 comment

Today I was importing some virtual machines (delivered by a 3rd party company) to the new vSphere 5 environment of a customer, the import was successful but after a vMotion I received this warning:

 

Module Migrate power on failed.
vMotion migration [168099940:1334234558581378] failed. The checkpoint data length (16384 bytes) or the offset (16776528 bytes) exceeds the maximum checkpoint data length (16777216 byte).

 

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Solution:

The owner of the template installed the OS with a 1920 x 1080 resolution, after changing the resolution to 1280 x 1024 the GFX memory usage degraded to normal (under 30 MB).

 

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After changing the resolution I was able to migrate the virtual machines,

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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: After upgrade to ESX 4.0 Host is incompatible with the virtual machine’s requirements

July 28th, 2009 No comments

After we update ESX3.5 to ESX4.00 we noticed that some vms would not vmotion to a different host. Every time we tried we got the following error message.

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VMware: VMotion CPU Compatibility Requirements for Intel Processors (1991)

June 8th, 2009 No comments

Why am I unable to migrate virtual machines with VMotion across Intel processors?

In ESX 3.5 Update 2 and later, VMware recommends using Enhanced VMotion Compatibility (EVC) to eliminate many VMotion CPU compatibility problems. For more information on EVC, see KB 1003212.
 
To ensure system stability during migration with VMotion, VirtualCenter and vCenter Server require the source and target CPUs to be compatible. For more information on CPU compatibility requirements, see Basic System Administration for your version of VirtualCenter or vCenter Server, available from http://www.vmware.com/support/pubs/.

If the source and target CPUs are incompatible for VMotion, you can:

  • Perform a cold migration (rather than a VMotion migration), thereby removing VMotion CPU requirements as an issue.
  • Remove VMotion compatibility constraints by modifying the default bit-mask used by VirtualCenter or vCenter Server. Note that some modifications discussed in this knowledge base article are neither supported nor recommended by VMware for production environments. In general, masking any CPU features intended for applications (such as SSE3) is not supported for VMotion. Use of EVC is recommended for migrating virtual machines across CPU generations.

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