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From: =?utf-8?Q?=C3=96zhan_R=C3=BCzgar_Karaman_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Updated] (CLOUDSTACK-8979) Centos7 vm disks attached as
 hda/ide not virtio
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     [ https://issues.apache.org/jira/browse/CLOUDSTACK-8979?page=3Dcom.atl=
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=C3=96zhan R=C3=BCzgar Karaman updated CLOUDSTACK-8979:
---------------------------------------------
    Summary: Centos7 vm disks attached as hda/ide not virtio  (was: Centos7=
 disks attached as hda/ide not virtio)

> Centos7 vm disks attached as hda/ide not virtio
> -----------------------------------------------
>
>                 Key: CLOUDSTACK-8979
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-897=
9
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the defa=
ult.)=20
>          Components: Storage Controller
>    Affects Versions: 4.5.2
>         Environment: ACS 4.5.2 over Ubuntu 14.03 KVM hypervizor
>            Reporter: =C3=96zhan R=C3=BCzgar Karaman
>              Labels: centos, libvirt, performance, storage_drivers, virti=
o
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> When you create a Centos 7 vm by choosing os type as CentOS7 then the cre=
ated vm did not use virtio it uses old hda/ide access technique and this pr=
oblem makes Centos 7 vm's to boot slowly(nearly 30 seconds wait after grub =
stage passed) and after system boots disk performance is not sufficient whe=
n you compare to virtio.=20
> When i change this value to virtio from libvirt i noticed that vm boots f=
ast with higher performance.
> Below are example libvirt disk access techniques for both CentOS 7 and Ub=
untu Trusty 14.04
> Example CentOS7 libvirt disk part:
>     <emulator>/usr/bin/kvm-spice</emulator>
>     <disk type=3D'network' device=3D'disk'>
>       <driver name=3D'qemu' type=3D'raw' cache=3D'none'/>
>       <auth username=3Dxx'>
>         <secret type=3D'ceph' uuid=3D'xsw'/>
>       </auth>
>       <source protocol=3D'rbd' name=3D'jacknode/4e2cd1be-5c7f-43ff-b44b-b=
f9f87e84b19'>
>         <host name=3D'172.16.44.22' port=3D'6789'/>
>       </source>
>       <target dev=3D'hda' bus=3D'ide'/>
>       <address type=3D'drive' controller=3D'0' bus=3D'0' target=3D'0' uni=
t=3D'0'/>
>     </disk>
> Example Ubuntu Trusty libvirt disk part:
>     <disk type=3D'network' device=3D'disk'>
>       <driver name=3D'qemu' type=3D'raw' cache=3D'none'/>
>       <auth username=3D'xx'>
>         <secret type=3D'ceph' uuid=3D'xsw'/>
>       </auth>
>       <source protocol=3D'rbd' name=3D'xx/cfafb241-b9c7-4d41-acdc-aac937d=
96a19'>
>         <host name=3D'172.16.44.22' port=3D'6789'/>
>       </source>
>       <target dev=3D'vda' bus=3D'virtio'/>
>       <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x04' =
function=3D'0x0'/>
>     </disk>



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