According to the Oracle documentation1, two statements that are true about enabling write-back
flash cache are:
Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy
configurations (A). This is because write-back flash cache provides better performance and reliability
for data file writes than write-through flash cache.
Before write-back flash cache is enabled, you need to drop the Flash Cache first (D). This is because
changing the flash cache mode requires recreating the flash cache with a different configuration.
