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live migration fails with following error "InvalidCPUInfo: Unacceptable CPU info: CPU doesn't have compatibility"

asked 2013-08-05 11:20:47 -0600

Ramkumar Raghavan gravatar image

updated 2013-08-05 11:24:23 -0600

Jobin gravatar image

I have two not so identical compute nodes I am trying live migration.

live migration fails with following error "InvalidCPUInfo: Unacceptable CPU info: CPU doesn't have compatibility"

Here the CPU info:

| cpu_info             | {"vendor": "Intel", "model": "SandyBridge", "arch": "x86_64", "features": ["osxsave", "pcid", "pdcm", "xtpr", "tm2", "est", "smx", "vmx", "ds_cpl", "monitor", "dtes64", "pbe", "tm", "ht", "ss", "acpi", "ds", "vme"], "topology": {"cores": 4, "threads": 1, "sockets": 1}} |


 cpu_info             | {"vendor": "Intel", "model": "SandyBridge", "arch": "x86_64", "features": ["erms", "smep", "fsgsbase", "rdrand", "f16c", "osxsave", "pcid", "pdcm", "xtpr", "tm2", "est", "vmx", "ds_cpl", "monitor", "dtes64", "pbe", "tm", "ht", "ss", "acpi", "ds", "vme"], "topology": {"cores": 4, "threads": 1, "sockets": 1}} |

Is there a possibility of live migration?

I have tried changing the libvirt cpu parameters as shown below and restarted nova.

libvirt_cpu_mode=custom
libvirt_cpu_model=Nehalem

But it doesn't work.

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answered 2013-08-06 00:39:15 -0600

unmesh-gurjar gravatar image

Going by the data above, it looks like your source compute CPU features are a super-set of the destination (new) compute. In this case, libvirt won't allow migration. However, I guess live migration should work the other way round (i.e. source and destination reversed).

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Asked: 2013-08-05 11:20:47 -0600

Seen: 1,525 times

Last updated: Aug 06 '13