Hello I''ve changed the OSS for ONE OST according to: http://wiki.lustre.org/manual/LustreManual20_HTML/LustreMaintenance.html While mounting the OST again i have message on MDS: Lustre: MGS: Regenerating lustre-OST0000 log by user request. Lustre: Client log for lustre-OST0000 was not updated; writeconf the MDT first to regenerate it. What should i do to solve this problem. Thank You in Advance. Jacek