Re: AHCI?

[Avi Kivity <avi@redhat.com>]

tsuraan wrote:
>> I see.  That sucks.
>>     
>
> Yeah...  Is there any reason that kvm is hard-coded to only allow 4
> IDE devices? Is it an issue with the BIOS implementation, or is it
> just a random limit?  If there's some macro somewhere that defines
> NUM_IDE to 2, and I could change that to 5, then I'd be perfectly
> happy; I don't really care about SCSI vs. IDE, I just want to be able
> to use 9 drives with kvm instead of the 4 that I'm currently able to
> access.
>   

If you want that and good performance too write a virtio driver, and use 
virtio disk instead of IDE or SCSI.

I don't think the IDE implementation in qemu supports more than four 
disks, that's an IDE limitation.  No doubt it could be worked around by 
adding more IDE controllers, it's probably not a lot of code but quite 
tricky.


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