weizhouapache commented on issue #7490:
URL: https://github.com/apache/cloudstack/issues/7490#issuecomment-2407291077
thanks @tcp-dw
I was able to reproduce the issue
- create vm
- attach 6 disks. it looks good
```
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='1'/>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
</controller>
<controller type='scsi' index='1' model='virtio-scsi'>
<alias name='scsi1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
</controller>
```
- stop and start the vm
```
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='1'/>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
</controller>
...
<controller type='scsi' index='1' model='lsilogic'>
<alias name='scsi1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</controller>
```
It seems to be a bug, as the controller id of all virtio-scsi disks are
hardcoded as 0 (`(short)0`)
https://github.com/apache/cloudstack/blob/e5bd83ea6a380c4435bb00c5bab6a58ab8622e2b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java#L2702
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