Hey,
We keep hearing that running Hypervisors (KVM) on the OSD nodes is a bad idea. But why exactly is that the case?
In our usecase, under normal operations our VMs use relatively low amounts of CPU resources. So are the OSD services, so why not combine them? (We use ceph for openstack volume/images storage, 7 shared OSD/KVM nodes, 2 pools, 128 PGs per pool, 2 OSDs per node, 10GigE)
I know that during recovery the OSD memory usage spikes. So I guess that might be one of the reasons.
But are there any other concrete examples of situations when the hypervisor could compete for CPU/mem resources with the OSD services running on the same node in a way which would noticeably impact the performance of either?
Kind Regards,
Piotr
Piotr
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