Damans227 commented on PR #14407:
URL: https://github.com/apache/cloudstack/pull/14407#issuecomment-6201655948

   > if the VM use IDE controller which support 2 CDROMs, the additional 
CD-ROMs (from 2nd CDROM) will use SATA controller or 2nd IDE controller, due to 
hardcoded `MAX_CDROMS_PER_VM = 2` , right ?
   
   @weizhouapache right, the limit of 2 is ours, not qemu's. with 4 always kept 
for the config drive, the ide bus is full after the first cd, so extra isos go 
on sata or a second ide controller. that also covers the running vm case, since 
the second iso no longer moves when a config drive shows up.


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