Hi, I just tried upgrading parts of our experimental ceph cluster from 0.56.1 to 0.60, and it looks like the new mon-daemon from 0.60 cannot talk to those from 0.56.1 at all. Long story short, we had to move some hardware around and during that time I had to shrink the cluster to one single machine. My plan was to expand it to three machines again, so that I would again have 3 mons and 3 osds, as before. I just installed the first new machine, going straight for 0.60, but leaving the remaining old one at 0.56.1. I added the new mon to the mon map according to the documentation and started the new mon daemon, but the mon-cluster wouldn't achieve quorum. In the logs for the new mon, I saw the following line repeated a lot: 0 -- 10.6.224.129:6789/0 >> 10.6.224.131:6789/0 pipe(0x2da5ec0 sd=20 :37863 s=1 pgs=0 cs=0 l=0).connect protocol version mismatch, my 10 != 9 The old mon had no such lines in its log. I could only solve this by shutting down the old mon and upgrading it to 0.60 as well. It looks to me like this means rolling upgrades without downtime won't be possible from bobtail to cuttlefish. Is that correct? Guido _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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