On 2014/03/11, 10:36 AM, "Laurent Herlaud" <lherlaud@arsystemes.fr<mailto:lherlaud@arsystemes.fr>> wrote: After a kernel panic on my OSS on RHEL 5, i decided to upgrade it on RHEL 6.4 Even more important - which version of Lustre did you upgrade from, and which version are you trying to run now? Cheers, Andreas I have 5 file system, and 2 of them doesn't want to remount. I first had problems to mount MDT and OST for them, with errors "transport endpoint not connected" but after an --eraseparams, it's OK. But i have an another problem when i want to mount them on clients : # mount /appli mount.lustre: mount lo1117@o2ib:lo1116@o2ib:/appli at /appli 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) lctl ping lo1116@o2ib and lctl ping lo1117@o2ib are OK. So I tried to umount the 2 OST associated with this filesystem, umount the MDT and umount the MGS. Then I remounted the MGS, and when i want to remount the MDT, he fails and tell me that file exists. mount.lustre: mount /dev/mapper/appli at /lustre/mdt_appli failed: File exists When i check /proc/fs/lustre/devices, i see this line about that filesystem : 19 AT osc appli-OST0002-osc-MDT0000 appli-MDT0000-mdtlov_UUID 1 I have double checked, but OSTs and MDT associated with filesystem "appli" are not mounted. Any idea ? Need a reboot here in any case. Cheers, Andreas -- Andreas Dilger Lustre Software Architect Intel High Performance Data Division