[GitHub] [cloudstack] svenvogel edited a comment on issue #3319: Use virtio for platform emulator strings starting with Windows*

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svenvogel edited a comment on issue #3319: Use virtio for platform emulator strings starting with Windows*
URL: https://github.com/apache/cloudstack/pull/3319#issuecomment-491415223
 
 
   @skattoju4 @ustcweizhou @syed i will try to explain it.
   
   > @ustcweizhou the thinking behind always setting the root disk to ide was to be able to boot a windows vm regardless of whether or not virtio drivers were installed. That said setting all disks to virtio when selecting "Windows PV" when registering the template is one way to move forward. 
   
   first i need to say is yes! let me explain. as written in #3089 we have "NOT" only the problem with template! 
   @DennisKonrad wrote:
   
   When we select "Windows Server 2016 (64-bit)" as OS Type for an **W2K16 cd image** the resulting
   VMs will not start with multiple disks attached. This is due to the usage of multiple IDE interfaces in the VM description XML.
   
   1. we create a machine with "Windows Server 2016 (64-bit)" we have **one** disk with type root "ide". 
   <img width="433" alt="Bildschirmfoto 2019-05-10 um 21 50 40" src="https://user-images.githubusercontent.com/5433844/57553232-53245e80-736e-11e9-8a70-8221a88c1c7a.png">
   2. after that we add **two more data disks** and they should be "NOT" ide because QEMU dont like this! When we use NFS the second and third disk will be a "virtio" disk automatically.
   
   this pr should "NOT" remove/break or add functionality. 
   
   it should be correct the normal functionality for managed storage like NFS works and qemu it wants if you choose "Windows Server 201X..." as OS Type. its a bug they only will affect (at least what i know) managed storage. If any user wants "ONLY" virtio driver he can choose "other pv ..." OS Type.
   <img width="431" alt="Bildschirmfoto 2019-05-10 um 21 58 11" src="https://user-images.githubusercontent.com/5433844/57553489-f7a6a080-736e-11e9-892e-b703a076d576.png">
   
   there is no discussion about remove perfomance of ide or move all Microsoft Windows OS Types to virtio. it should clear for everybody here that virtio is faster than ide and yes we dont need for the root disk a driver. this is just as little the content of the discussion.
   
   i hope it is more clear now?

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