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Hello,
We just upgraded from Hammer to Jewel, and after the cluster once again reported a healthy state I set the crush tunables to ‘optimal’ (from legacy).
12 hours later and the cluster is almost done with the pg remapping under the new rules.
The issue I am having is the server where we mount the krbd images is showing errors in the kern.log:
May 24 07:28:14 rbd1 kernel: [5600763.226208] libceph: osd192 10.35.1.235:6844 feature set mismatch, my 2b84a042a42 < server's 40002b84a042a42, missing 400000000000000
And I can no longer list any of the mounted filesystems or unmap the rbd images, etc.
My options seem to be:
1)set the tunables back to legacy and see if the rbd server starts responding.
2)upgrade the kernel on the rbd server to at least version 4.5 (currently using 3.18 on Ubuntu 14.04).
3)disable some features on our current images?
I would like to try option 2 first…but I am wondering if is safe to reboot the server with the rbd images still mapped…is there any chance of data loss from an rbd image getting corrupted?
Any other suggestions?
Thanks,
Shain
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