RHEL Kernel Performance Optimization, Characterization ... - Red Hat

Using IOzone w/ o_direct – mimic database Problem :●●●Filesystems use memory for file cacheDatabases use memory for database cacheUsers want filesystem for management outside databaseaccess (copy, backup etc) You DON'T want BOTH to cache. Solution :●●●●Filesystems that support Direct IOOpen files with o_direct optionDatabases which support Direct IO (ORACLE)NO DOUBLE CACHING!