As for the tuning, that looks good (-T largefile4 should automatically do tunings such as large block sizes, inode counts, etc.).
Originally Posted by amitabhm
Also after doing some googling I reduced the space reserved for super user to 2%. What does this space reserved for super user meant for?
Can I do some more performance tuning?
It means that when the disk is full for normal users, the superuser may write to some reserved space. This is good for instances where you have a single root filesystem, which has run out of space because of user X’s actions. But you don’t want user X’s actions to stop the daemons (e.g., syslogd and friends) from doing their jobs. This is a very old solution to the problem. More modern-day solutions include separate home partitions and user quotas.