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I have now recognized that many discussion going in one direction – “do not use RtC on Storwize”. This is not the testimony of the white paper. In this specific customer situation the right decision was to switch off RtC for these 6 volumes. The reasons have been found in the analysis of the managed disk group cache where we found the cache exhausted and never recovering to empty.
I have seen several installations where RTC is running with excellent results. It is, as always, dependent on the kind of workload, whether RtC makes sense or not. In this case we had a very high workload on the compressed disks which was mostly write and highly random. You cannot copy this as a general recipe to fix Storwize problems. An analysis should always be the start.