Influxdb pod much slower than server installation

I have TIG (telegraf, influxdb and grafana) stack deployed in a server. Recently, I’ve been trying to move TIG stack to Openshift/Kubernetes bare-metal installation. For some reason, influxdb pod in Kubernetes is about 3 times slower than server installation (I tested this by timing a query on both installations). All servers have similar specs and sufficient resources available. I suspected it may be because of slow read/writes to persistent volume attached to the influxdb pod but upon testing I’m getting ~360MB/s read/write speeds which I believe is significantly more than needed.

Can anyone please suggest any further troubleshooting steps? something I’m missing? or maybe some influxdb configuration to make it faster in the pod?

Thanks,