Hi,

On 13/12/2018 15:48, Dietmar Rieder wrote:

one of our OSD nodes is experiencing a Disk controller problem/failure
(frequent resetting), so the OSDs on this controller are flapping
(up/down in/out).

Ah, hardware...

I have some simple questions, what are the best steps to take now before
an after replacement of the controller?

I would stop all the OSDs on the affected node and let the cluster rebalance. Once you've replaced the disk controller, start them up again and Ceph will rebalance back again.

Regards,

Matthew


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