Use the following methods to monitor Exadata Smart Flash Cache usage:
AWR report, in the Exadata Statistics section.
Under Performance Summary you can find various statistics related to Flash Cache and its benefits.
Under Exadata Smart Statistics there is a section for Flash Cache with several different reports on Exadata Smart Flash Cache statistics.
ExaWatcher reports
Flash Cache size and read, write, and population operation
related stats are exposed in the Cell Server Charts and in the FlashCache
related stats section.
Use the CellCLI LIST command to display and monitor metrics for the flash cache.