Welcome to the Community,
unfortunately according to http://www.dell.com/content/topics/topic.aspx/global/products/pvaul/topics/en/us/raid_controller?c=us&l=en&cs=555 the PERC H200 does not allow to add a BBU option (battery backed cache) which is important for disk performance. Without BBU the controller operates in write-through mode (i.e. each write operation has to ba acknowledged by the disks) which is way slower than write-back (with BBU).
André