Question about upgrading ceph clusters from Hammer to Jewel

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Hi, everyone.

 

I intend to upgrade one of our ceph clusters from Hammer to Jewel, I wonder in what order I should upgrade the MON, OSD and LIBRBD? Is there any problem to have some of these components running Hammer version while others running Jewel version? Do I have to upgrade QEMU as well to adapt to the Jewel version’s LIBRBD?

 

Thank youJ

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