[rdo-users] Poor Ceph Performance

Hello, My tripleO cluster is deployed with Ceph. Both Cinder and Nova use RBD as backend. While all essential functions work, services involving Ceph are getting very poor performance. E.g., it takes several hours to upload an 8GB image into Cinder and about 20 minutes to completely boot up an instance (from launch to ssh ready). Running 'ceph -s' shows a top write speed at 6~700 KiB/s during image upload and read speed 2 MiB/s during instance launch. I used the default scheme for network isolation and a single 1G port for all VLAN traffics on each overcloud node. I haven't set jumbo frame on the storage network VLAN yet, but think the performance should not be this bad with MTU 1500. Something must be wrong. Any suggestions for debugging? Thank you very much. Best regards, Cody