Question:Edit
When I try to install OpenVZ Kernel, I see this error.
WARNING: No module ahci found for kernel 2.6.9-023stab037.3, continuing anyway
What do I do?
Answer:Edit
As you can see this is not an error, but rather a warning. While installing the kernel package, system tries to create an initrd image with some predefined set of driver modules. In OpenVZ kernel, a few modules are built into the kernel, so they do not come as a modules — and this is where this warning comes from.
In short: this is just a warning, it should be ignored since the driver in question is compiled into the kernel.