Add a note about setting up the Dell PERC H730.

Ticket: #18136

userguide/intro.rst

@@ -334,11 +334,21 @@ Reliable disk alerting and immediate reporting of a failed drive can
 be obtained by using an HBA such as an Avago MegaRAID controller or a
 3Ware twa-compatible controller.
 
+.. index:: Highpoint RAID
+
 Some Highpoint RAID controllers do not support pass-through of
 S.M.A.R.T. data or other disk information, potentially including disk
 serial numbers. It is best to use a different disk controller with
 %brand%.
 
+
+.. index:: Dell PERC H730
+
+.. note:: Dell PERC H730 disk controllers can be problematic. For best
+   results, set the controller to HBA mode and add a loader
+   :ref:`tunable <Tunables>` of :literal:`hw.mfi.mrsas_enable="1"`.
+
+
 Suggestions for testing disks before adding them to a RAID array can
 be found in this
 `forum post