We recently enabled verbs/rdma on our IB network (previously we used IPoIB exclusively) and now are getting all sorts of errors/warning in logs:
Jun 25 23:41:30 gssio2 mmfs: [E] VERBS RDMA rdma read error IBV_WC_RETRY_EXC_ERR to 172.41.125.27 (qnode4111-ib0.quest) on mlx5_0 port 1 fabnum 0 vendor_err 129 Jun 25 23:41:30 gssio2 mmfs: [E] VERBS RDMA closed connection to 172.41.125.27 (qnode4111-ib0.quest) on mlx5_0 port 1 fabnum 0 due to RDMA read error IBV_WC_RETRY_EXC_ERR index 1589 Jun 25 20:40:05 gssio2 mmfs: [N] VERBS RDMA closed connection to 172.41.124.12 (qnode4054-ib0.quest) on mlx5_0 port 1 fabnum 0 index 1417 Jun 25 18:30:01 ems1 root: mmfs: [N] VERBS RDMA closed connection to 172.41.130.131 (qnode6131-ib0.quest.it.northwestern.edu) on mlx5_0 port 1 fabnum 0 index 195 Jun 25 18:28:23 gssio2 mmfs: [N] VERBS RDMA closed connection to 172.41.130.131 (qnode6131-ib0.quest.it.northwestern.edu) on mlx5_0 port 1 fabnum 0 index 1044 Something to note (not sure if this is important or not) is that our ESS storage cluster and our login nodes are in connected mode with 64K MTU and all compute nodes are in datagram mode with 2.4K MTU. Are these messages something to be concerned about? Cluster seems to be performing well and although there are some node ejections, they do not seem higher than before we turned on verbs/rdma. Thanks, Damir
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