Hi, I''ve upgraded Lustre installation from 1.5.6 to 1.6.4 and after mount attept on a client node evry time i get the following error: -------------- Dec 8 19:07:46 vs64h1 [ 3218.642824] LustreError: 4097:0:(client.c:975:ptlrpc_expire_one_request()) @@@ timeout (sent at 1197137166, 100s ago) req at ffff810039f78c00 x36/t0 o503->MGS at MGC192.168.0.4@tcp_0:26 lens 176/8320 ref 1 fl Rpc:/0/0 rc 0/-22 Dec 8 19:07:46 vs64h1 [ 3218.642994] LustreError: 166-1: MGC192.168.0.4 at tcp: Connection to service MGS via nid 192.168.0.4 at tcp was lost; in progress operations using this service will fail. Dec 8 19:09:26 vs64h1 [ 3318.578560] LustreError: 15c-8: MGC192.168.0.4 at tcp: The configuration from log ''beta7-client'' failed (-5). 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. Dec 8 19:09:26 vs64h1 [ 3318.578772] LustreError: 4097:0:(llite_lib.c:1021:ll_fill_super()) Unable to process log: -5 Dec 8 19:09:26 vs64h1 [ 3318.579074] Lustre: MGC192.168.0.4 at tcp: Reactivating import Dec 8 19:09:26 vs64h1 [ 3318.579125] Lustre: MGC192.168.0.4 at tcp: Connection restored to service MGS using nid 192.168.0.4 at tcp. Dec 8 19:09:26 vs64h1 [ 3318.581448] Lustre: client ffff810038fb3400 umount complete Dec 8 19:09:26 vs64h1 [ 3318.581501] LustreError: 4097:0:(obd_mount.c:1924:lustre_fill_super()) Unable to mount (-5) --------- The partitions was reformated using 1.6.4, server is using 2.6.18.8 vanilla kernel, client 2.6.21.5, i followed the instructions in http://wiki.lustre.org/index.php?title=Mount_Conf All nodes are reachable with lctl ping (there were no configuration changes except lustre and lernel version) TIA, Konrad Gutkowski ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.