Expected performane with Ceph iSCSI gateway

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Hi,

I an test cluster (3 nodes, 24 osd's) I'm testing the ceph iscsi gateway (with http://docs.ceph.com/docs/master/rbd/iscsi-targets/). For a client I used a seperate server, everything runs Centos 7.5. The iscsi gateway are located on 2 of the existing nodes in the cluster.

How does iscsi perform compared to krbd? I've already did some benchmarking, but it didn't performed any near what krbd is doing. krbd easily saturates  the public netwerk, iscsi about 75%. Tmcu-runner is running during a benchmark at a load of 50 to 75% on the (owner)target


Regards,

Frank de Bot
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