In the PERC BIOS or hardware level there is not an option in the H730P to create cache disks. Disk cache is handled by the memory on the PERC controller. All disks attached to the backplane are controlled by the PERC controller.   What is the reason for needing to set up cache disk and desired purpose? If you private message me your service tag I can get a look at your system build.  
Hi all, I have a R740xd with H730P mini and we want to configure 2 disks as RAID1 for OS and other 2 disk for cache but I dont see how to configure it. Could someone explain how to configure SSD as cache on this platform?. Regards,
R740xd disk cache