Özhan Rüzgar Karaman created CLOUDSTACK-8979:
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Summary: Centos7 disks attached as hda/ide not virtio
Key: CLOUDSTACK-8979
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8979
Project: CloudStack
Issue Type: Bug
Security Level: Public (Anyone can view this level - this is the default.)
Components: Storage Controller
Affects Versions: 4.5.2
Environment: ACS 4.5.2 over Ubuntu 14.03 KVM hypervizor
Reporter: Özhan Rüzgar Karaman
When you create a Centos 7 vm by choosing os type as CentOS7 then the created
vm did not use virtio it uses old hda/ide access technique and this problem
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 when you
compare to virtio.
When i change this value to virtio from libvirt i noticed that vm boots fast
with higher performance.
Below are example libvirt disk access techniques for both CentOS 7 and Ubuntu
Trusty 14.04
Example CentOS7 libvirt disk part:
<emulator>/usr/bin/kvm-spice</emulator>
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username=xx'>
<secret type='ceph' uuid='xsw'/>
</auth>
<source protocol='rbd'
name='jacknode/4e2cd1be-5c7f-43ff-b44b-bf9f87e84b19'>
<host name='172.16.44.22' port='6789'/>
</source>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
Example Ubuntu Trusty libvirt disk part:
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<auth username='xx'>
<secret type='ceph' uuid='xsw'/>
</auth>
<source protocol='rbd' name='xx/cfafb241-b9c7-4d41-acdc-aac937d96a19'>
<host name='172.16.44.22' port='6789'/>
</source>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</disk>
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