We had faulty disk in RAID-0 and had to replace it.
New disk is now Ready (as you can see below through iDRAC)




We need to add a new Virtual disk volume named "Virtual Disk 3" as replacement for this new disk

I did then create virtual disk (named "Virtual Disk 3") | Advanced Configuration | then selected same settings you see for other disks (No Read Ahead, Write Through) then finally click "Add to Pending". I get error below. 
I am not clear what to do from here, the disk is new, why would I recover anything fmor the pinned cache ?

I am not sure but I guess I need to select action "discard preserved Cache " on Controller through iDRAC as you see below. Is it correct ? This is a production server so, not sure about this step, need confirmation that it will not delete/change anything for the other RAID-0 disks or change the RAID-1 boot one ? Can anyone confirm that this is no risk ?