The official documentation [*] says that the only requirement to use the balancer in upmap mode is that all clients must run at least luminous.
But I read somewhere (also in this mailing list) that there are also requirements wrt the kernel.
If so:
1) Could you please specify what is the minimum required kernel ?
2) Does this kernel requirement apply only to the OSD nodes ? Or also to the clients ?
The ceph version I am interested in is Luminous
Thanks a lot, Massimo
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