We have been working with the LSI Cachecade for a long time and have not heard of such an incident, we have the drivers inside of the DSS V6 and V7 but the drivers do not corrupt the data, this would be on the hardware side. The best would be to use the Snapshot function of the DSS and you can create tasks so that the Snapshot will be available for 3 weeks, so in the event your hardware has issues you can retrieve the data.