Jan 2017 Disk Performance SL6 v SL7

The duration of all graphs is 840 seconds. The data transferred for all is approx. 300 GB.
The first 3 are for the ext4 file system. The first is for SL6, the next is SL7 w/ dirty_ratio=20 and the 3rd is SL7 w/ dirty ratio=2.
The last 3 graphs are for the xfs file system.