HPE Smart Array P816i-a SR Smart-Cache not able to change Ratio

Hi

We use HPE Smart Array P816i-a SR on Gen10 DL 380 server and added a 400GB SSD disk for SmartCache. The problem is, everytime we create the smart cache, we are not able to change the Cache-Ration from 0/100 to 50/50 what we prefer. In the current Smart Staorage Administrator 3.47.6.0 there is no option to change the Ratio. In the details we get the current settings of the Ration and it always shows 0% Read / 100% Write, but where the hell can we change the Ratio?

Thanks