Hi list my cluster include 4 nodes , 1 mon ,3 osd nodes(4 SATA/node),totall 12 osds. ceph version is 0.72. each osd node has 1Gbps NIC, mon node has 2*1Gbps NIC. tgt is on mon node, client is vmware. upload(copy) a 500G file in Vmware. the HW Accelerated in VMware had turned off as Nick suggest. test 1: tgt backend is krbd (kernel), tgt cache on the bw is 90MB/s test 2: tgt backend is krbd, tgt cache off , the bw is 20MB/s (poor) test 3: tgt backend is librbd, tgt cache on , the bw is 5MB/s ,but when the client is linux iscsi initiator or windows iscsi initiator the bw is 90MB/s test 4: tgt backend is librbd, tgt cache on ,use stripe --format 2 ,the bw is still 5MB/s ,but when the client is linux iscsi initiator or windows iscsi initiator the bw is 90MB/s why the performance is so poor (5MB/s) when client is wmware and librbd as tgt backend , is there any setting or configure need to do in vmware or ceph.
thanks.
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