This read-only Gauge32 field is the 'memCached' property of the 'FexSystemStatsHist' managed object in Cisco UCS Manager's equipment-inventory schema recording the filesystem-cache memory usage on the FEX's onboard OS at the moment this historical sample was archived. This preserves a specific past cache-usage reading, giving context for whether a historical drop in available memory was due to genuine pressure or simply heavier caching at that moment. An archived MemCached of 45MB paired with a healthy MemAvailable for that same stored row shows the memory was being used productively for cache, not lost to a leak.