weizhouapache commented on PR #14407:
URL: https://github.com/apache/cloudstack/pull/14407#issuecomment-6199783136

   > overall the changes look good.
   > 
   > nit: what happens if a running vm is added to a config drive network and 
then gets a second iso? looks like the iso goes to a drive that was never set 
up at start, so the attach fails until a restart.
   
   good point.
   
   if so, I would advise to reserve device id 3 as primary CD-ROM, and device 
id 4 as configdrive ISO.
   
   if the VM use IDE controller which support 2 CDROMs, the additional CD-ROMs 
(from 2nd CDROM) will use SATA controller, due to hardcoded `MAX_CDROMS_PER_VM 
= 2` , right ?
   


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