This Gauge32 is the high-water mark for memory-sparing errors on this CPU recorded during the trailing 1-day window. An admin uses 1DayH to know how many sparing failovers accumulated at their worst point in the last day for that processor's memory subsystem. For example, a large 1DayH with a much smaller current 1Day rate would suggest a cluster of failures that has since calmed down but still warrants a hardware check.