Re: [HPDD-discuss] Upgrading lustre servers from 2.6.0 to 2.6.90 risks

Hi, We have a fs with 3OSTS(~200TB)+1MDS,ldiskfs on CentOS6.6 . The upgrading gone smoothly without loosing data. But there is a BUG regarding to logs, I am not able to clean/remove change_logs. The crush of MDT is triggered on lfs clean_logs command. Our another system with 24OSTs is running with inkernel-2737-gbe60ead-PRISTINE-2.6.32-431.29.2.el6_lustre.gbe60ead.x86_64 since 6 month under heavy load w/o problems. If you are not using change logs probably it will be ok to upgrade. With zfs backend I was not able to proceed after the upgrade. Somehow the zfs version 0.6.3-1.2 vs 0.6.3-1.1 are not compatible with the osd_zfs. One need to be careful with upgrades usually it a dangerous procedure, at least be sure that you have most of the data on the backup. I am curios if your upgrade will be successful. cheers, arman. *********************************************************** Dr. Arman Khalatyan eScience -SuperComputing Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam, Germany *********************************************************** On Tue, Jan 6, 2015 at 10:17 AM, Jérôme BECOT <jerome.becot(a)inserm.fr&gt; wrote: