On Mon, Sep 10, 2018 at 7:46 PM David Turner <drakonstein@xxxxxxxxx> wrote:
>
> Now that you mention it, I remember those threads on the ML. What happens if you use --yes-i-really-mean-it to do those things and then later you try to map an RBD with an older kernel for CentOS 7.3 or 7.4? Will that mapping fail because of the min-client-version of luminous set on the cluster while allowing CentOS 7.5 clients map RBDs?
Yes, more or less.
If you _just_ set the require-min-compat-client setting, nothing will
change. It's there to prevent you from accidentally locking out older
clients by enabling some new feature. You will continue to be able to
map images with both old and new kernels.
If you then go ahead and install an upmap exception (manually or via
the balancer module), you will no longer be able to map images with old
kernels.
This applies to all RADOS clients, not just the kernel client.
Thanks,
Ilya
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