Hi: Excause me, I am not very good at English. We have a luster cluster with IB network . 1. mgs config like below , I think can access with tcp and o2ib $ more /etc/modprobe.d/lustre.conf options lnet networks=o2ib0(ib0),tcp0(ib0) $ tunefs.lustre /dev/mapper/mdt1 checking for existing Lustre data: found CONFIGS/mountdata Reading CONFIGS/mountdata Read previous values: Target: majorbio-MDT0000 Index: 0 Lustre FS: majorbio Mount type: ldiskfs Flags: 0x5 (MDT MGS ) Persistent mount opts: user_xattr,errors=remount-ro Parameters: mdt.identity_upcall=NONE mgsnode=192.168.10.110@o2ib,192.168.10.110@tcp Permanent disk data: Target: majorbio-MDT0000 Index: 0 Lustre FS: majorbio Mount type: ldiskfs Flags: 0x5 (MDT MGS ) Persistent mount opts: user_xattr,errors=remount-ro Parameters: mdt.identity_upcall=NONE mgsnode=192.168.10.110@o2ib,192.168.10.110@tcp exiting before disk write. when a client with IB network can run the command " mount -t lustre 192.168.10.110@tcp:/majorbio /mnt/lustre " successful . then, I config the IB network with vmware ESXI as this article http://www.bussink.ch/?p=1306 ,vmware ESXI can display the IB network as eth equipment. On the virtual machine (centos 6.6 ) , I install module lustre, lnet , $ lctl ping 192.168.10.110@o2ib failed to ping 192.168.10.110@o2ib: Input/output error $ lctl ping 192.168.10.110@tcp 12345-0@lo 192.168.10.110@o2ib 192.168.10.110@tcp the problem is , when I mount the lustre file system $ mount.lustre 192.168.10.110@tcp:/majorbio /mnt/lustre/ mount.lustre: mount 192.168.10.110@tcp:/majorbio at /mnt/lustre failed: No such file or directory Is the MGS specification correct? Is the filesystem name correct? If upgrading, is the copied client log valid? (see upgrade docs) $tail -f /var/log/messages Jul 22 15:01:27 localhost kernel: LustreError: 1517:0:(ldlm_lib.c:433:client_obd_setup()) can't add initial connection Jul 22 15:01:27 localhost kernel: LustreError: 1517:0:(obd_config.c:572:class_setup()) setup majorbio-MDT0000-mdc-ffff88007a751000 failed (-2) Jul 22 15:01:27 localhost kernel: LustreError: 1517:0:(obd_config.c:1591:class_config_llog_handler()) MGC192.168.10.110@tcp: cfg command failed: rc = -2 Jul 22 15:01:27 localhost kernel: Lustre: cmd=cf003 0:majorbio-MDT0000-mdc 1:majorbio-MDT0000_UUID 2:192.168.10.110@o2ib Jul 22 15:01:27 localhost kernel: LustreError: 15c-8: MGC192.168.10.110@tcp: The configuration from log 'majorbio-client' failed (-2). This may be the result of communication errors between this node and the MGS, a bad configuration, or other errors. See the syslog for more information. Jul 22 15:01:27 localhost kernel: LustreError: 1508:0:(llite_lib.c:1042:ll_fill_super()) Unable to process log: -2 Jul 22 15:01:27 localhost kernel: LustreError: 1508:0:(obd_config.c:619:class_cleanup()) Device 3 not setup Jul 22 15:01:27 localhost kernel: Lustre: Unmounted majorbio-client Jul 22 15:01:27 localhost kernel: LustreError: 1508:0:(obd_mount.c:1320:lustre_fill_super()) Unable to mount (-2) Thanks for any help! zhaohua.cui(a)majorbio.com