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From GitBox <...@apache.org>
Subject [GitHub] [cloudstack] svenvogel edited a comment on issue #3319: Use virtio for platform emulator strings starting with Windows*
Date Fri, 10 May 2019 20:29:10 GMT
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 have 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 those should "NOT" be 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 enable the normal functionality for managed storage according to NFS works and
it is needed by QEMU if we choose "Windows Server 201X..." as OS Type. it is a bug that will
affect only managed storage (as far as i i know). 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 performance of IDE or move all Microsoft Windows OS Types
to virtio. it should be clear for everybody here that virtio is faster than ide and yes we
dont need a driver for the root disk. this is just as little the content of the discussion.
   
   i hope it is more clear now?

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