I asked back in September about getting the Centos6-HVM AMI updated to support the C4-8XL instance type.  Karanbir responded

  https://lists.centos.org/pipermail/centos-virt/2016-September/005222.html

but I still see no evidence this has happened.  This is a major thorn in our side and has prevented us from going completely to the C4 instance type
​, which we need for performance​ (both CPU and network).

Thanks in advance

John

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JOHN PEACOCK
senior software build and release engineer