Marty30886,   I apologize for the misunderstanding, as I am not fluent in Ansible I was leaning hardware. I researched the issue that you're facing and what I determined was that the process you're using (dellemc_idrac_storage_volume) will create a spanned raid 10, but can't be reconfigured after it is created. What you can do instead is to use Volume_type:spanned mirrors, as shown here, and this will create the raid 10's which can be reconfigured after creation.  The link I specified is for a raid 1 configuration, but can be applied for the raid 10.  So the underlying issue is the playbook you're using, utilizes the SCP which only creates RAID10s in a way which cannot be reconfigured.   Sorry for the delay, but let me know if this helps.      
Hello, I have problem with creating RAID10 via Ansible. Everything works without problem. RAID 10 is successfully created, but main problem is, that I cannot "reconfigure" this raid afterwards. This option is missing. When I create this VD manually in BIOS, I can see this option. I tried many configuration options, but same results. It looks like that problem is with span_depth, because I tried RAID1 and RAID5 with "1" and "reconfigure" working, when I change this value to "2" for RAID10 option "reconfigure" is gone. You can see differences on screens below: ansible pic1 and pic2 manually in bios pic1 and pic2    
RAID10 via Ansible on R640 and PERC H730P Mini