Hello,
I am considering enabling optimal crush tunables in our Jewel cluster (4 nodes, 52 OSD, used as OpenStack Cinder+Nova backend = RBD images). I've got two questions:
1. Do I understand right that having the optimal tunables on can be considered best practice and should be applied in most scenarios? Or is there something I should be warned about?
2. There's a minimal kernel version requirement for KRBD clients. Does a similar restriction apply on librbd (libvirt-qemu) clients too? Basically, I just need to ensure we're not going to harm our clients (OpenStack instances) after setting the tunables. We're running version 4.4 Linux kernels on compute nodes, which is not supported by KRBD with Jewel set of tunables.
Thanks and greetings,
Lukas
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