Hello,

We are running a ceph nautilus cluster under centos 7. To upgrade to pacific we need to change to a more recent distro (probably debian or ubuntu because of the recent announcement about centos 8, but the distro doesn't matter very much).

However, I could'nt find a clear procedure to upgrade ceph AND the distro !  As we have more than 100 osds and ~600TB of data, we would like to avoid as far as possible to wipe the disks and rebuild/rebalance. It seems to be possible to reinstall a server and reuse the osds, but the exact procedure remains quite unclear to me.

What is the best way to proceed ? Does someone have done that and have a rather detailed doc on how to proceed ?

Thanks for your help !

F.

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