Hi, Me again! :-) I am getting errors before being able to mount clients. On o2ib networks, I tried 3 or 4 clients which behave the same: error on first mount and second try mounts. ib3-bc3e41-be02:~# mount -t lustre ib3-st01s at o2ib3:ib3-st02s at o2ib3:/sata /mnt/sata mount.lustre: mount ib3-st01s at o2ib3:ib3-st02s at o2ib3:/sata at /mnt/sata failed: Cannot send after transport endpoint shutdown ib3-bc3e41-be02:~# mount -t lustre ib3-st01s at o2ib3:ib3-st02s at o2ib3:/sata /mnt/sata Generating a network error in the logs: Dec 22 15:53:21 ib3-bc3e41-be03 kernel: [263682.370607] Lustre: 2671:0:(client.c:1487:ptlrpc_expire_one_request()) @@@ Request x1388634652055195 sent from MGC10.10.135.115 at o2ib3 to NID 10.10.135.115 at o2ib3 0s ago has failed due to network error (5s prior to deadline). Dec 22 15:53:21 ib3-bc3e41-be03 kernel: [263682.370611] req at ffff8804917c4c00 x1388634652055195/t0 o250->MGS at MGC10.10.135.115@o2ib3_0:26/25 lens 368/584 e 0 to 1 dl 1324569206 ref 1 fl Rpc:N/0/0 rc 0/0 Dec 22 15:53:21 ib3-bc3e41-be03 kernel: [263682.370617] Lustre: 2671:0:(client.c:1487:ptlrpc_expire_one_request()) Skipped 108 previous similar messages On my TCP clients, it is a little bit different: ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: Cannot send after transport endpoint shutdown ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists ib4-bc1f82-be13:~# mount -t lustre ib3-st01e at tcp:ib3-st02e at tcp:/sata /mnt/sata mount.lustre: mount ib3-st01e at tcp:ib3-st02e at tcp:/sata at /mnt/sata failed: File exists . . . Then finally mounts after several tries. Log files shows a network error once again: Dec 22 15:59:43 ib4-bc1f82-be13 kernel: [172481.077865] Lustre: MGC10.10.132.115 at tcp: Reactivating import Dec 22 15:59:43 ib4-bc1f82-be13 kernel: [172481.087738] Lustre: 3057:0:(client.c:1487:ptlrpc_expire_one_request()) @@@ Request x1388731500687365 sent from sata-OST0004-osc-ffff88096cd98000 to NID 10.10.132.111 at tcp 0s ago has failed due to network error (5s prior to deadline). I know it is related to network, but my own network works just fine. What about lnet? How can I explain/eliminate that problem? Thanks! Greetings! -- Patrice Hamelin Specialiste s?nior en syst?mes d''exploitation | Senior OS specialist Environnement Canada | Environment Canada 2121, route Transcanadienne | 2121 Transcanada Highway Dorval, QC H9P 1J3 T?l?phone | Telephone 514-421-5303 T?l?copieur | Facsimile 514-421-7231 Gouvernement du Canada | Government of Canada