Yes, that's what I did - as long as you don't affect the OSD data/partitions, they should come up again just fine once you reinstall ceph. I expect once the mandatory switch to ceph-volume finally happens this process might get a little more complicated but for jewel you're still using ceph-disk so it's just using udev rules to identify the OSDs and it will bring them up at start. Rich On 17/04/18 15:50, Shain Miley wrote: > Rich, > > Thank you for the information. Are you suggesting that I do a clean install of the OS partition...reinstall the Ceph packages, etc...and then Ceph should be able to find the OSDs and all the original data. > > I did do something similar one time when we had a MBR failure on a single node and it would no longer boot up..however that was quite some time ago. > > As far as I remember Ceph found all the OSD data just fine and everything did startup in a good state post OS reinstall. > > Thanks again for your help on this issue. > > Shain > > > On 04/17/2018 06:00 AM, Richard Hesketh wrote: >> On 16/04/18 18:32, Shain Miley wrote: >>> Hello, >>> >>> We are currently running Ceph Jewel (10.2.10) on Ubuntu 14.04 in production. We have been running into a kernel panic bug off an on for a while and I am starting to look into upgrading as a possible solution. We are currently running version 4.4.0-31-generic kernel on these servers and have run across this same issue on multiple nodes over the course of the last 12 months. >>> >>> My 3 questions are as follows: >>> >>> 1)Are there any known issues upgrading a Jewel cluster to 16.04? >>> >>> 2)At this point is Luminous stable enough to consider upgrading as well? >>> >>> 3)If I did decide to upgrade both Ubuntu and Ceph..in which order should the upgrade occur? >>> >>> Thanks in advance for any insight that you are able to provide me on this issue! >>> >>> Shain >> When Luminous came out I did a multipart upgrade where I took my cluster from 14.04 to 16.04 (HWE kernel line), updated from jewel to luminous and migrated OSDs from filestore to bluestore (in that order). I had absolutely no issues throughout the process. The only thing I would suggest is that you reinstall your nodes to 16.04 rather than release-upgrading - previous experience with trying to release-upgrade on other hosts was sometimes painful, rebuilding was easier. >> >> Rich
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