Hello, I have a VM, running on a compute-1 with 20vCPU - 1 socket CPU.

compute-1 # lscpu | grep NUMA
NUMA node0 CPU(s):     0-19

from controller, I can see only 14vCPU available.

controller-1 # openstack hypervisor show 1 | grep -i "vcpus"
| vcpus                | 14   |
| vcpus_used           | 8  |

recently I have only one VM running in this compute, with flavor 8vCPU, 20GB memory, and 10GB Disk, with flavor properties: hw:cpu_policy='dedicated', hw:mem_page_size='1048576' .

I would like to resize the memory size of this VM, from 20GB to 30GB.

so I create a new flavor with exactly same flavor properties but Memory 30GB. then I shutdown the VM, and perform nova resize.

compute-1 # nova resize VM flavor_30G --poll
Server resizing... 0% complete
Error resizing server
ERROR (ResourceInErrorState):

but it does not works, it says:

“Insufficient compute resources: Requested instance NUMA topology cannot fit the given host NUMA topology”

I would like to know, why it is happening? and how to make this scenario works?

thank you