Hi, Nick.
As far as I know, there isn't a way to guarantee which slots are used.
However, I did a little testing and it seems this only happens when a
NIC is added while the VM is running. After it is stopped, following
restarts don't change the interface slots until another device is added.
Out of curiosity, could you elaborate on why you need it to be the same?
Perhaps there are alternatives.
Regards,
Gabriel Santos
On 10/3/25 14:56, work wrote:
Hello All,
I am using cloudstack version 4.19 with KVM host and trying to add nic and
disk to a running instance and the pci slot for it changes when I reboot
the instance.
NIC before reboot:
<interface type='bridge'>
<source bridge='breth2-310'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
NIC1
<interface type='bridge'>
<source bridge='breth2-313'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</interface>
NIC after reboot
<interface type='bridge'>
<source bridge='breth2-310'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
NIC1
<interface type='bridge'>
<source bridge='breth2-313'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</interface>
Please suggest what can be done here.
Thanks in advance for any suggestions.
Regards,
Nick.
