Hi Stijn, > the IPoIB network is not 56gb, it's probably a lot less (20gb or so). > the ib_write_bw test is verbs/rdma based. do you have iperf tests > between hosts, and if so, can you share those reuslts?
Wow - indeed, yes, I was completely mistaken about ib_write_bw. Good that I asked! You are completely right, checking with iperf3 I get: [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 18.4 GBytes 15.8 Gbits/sec 14242 sender [ 4] 0.00-10.00 sec 18.4 GBytes 15.8 Gbits/sec receiver Taking into account that the OSDs also talk to each other over the very same network, I can totally follow the observed client throughput. This leaves me with two questions: - Is it safe to use RDMA with 12.2.2 already? Reading through this mail archive, I grasped it may lead to memory exhaustion and in any case needs some hacks to the systemd service files. - Is it already clear whether RDMA will be part of 12.2.3? Also, of course the final question from the last mail: "Why is data moved in a k=4 m=2 EC-pool with 6 hosts and failure domain "host" after failure of one host?" is still open. Many thanks already, this helped a lot to understand things better! Cheers, Oliver
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