I don't think it can be done for RAID 10 (two spans), info here: https://www.broadcom.com/support/knowledgebase/1211161503168/how-to-expand-an-array-on-megaraid-controllers-adding-drives-to-
The RS2BL080 is a rebranded LSI MegaRAID 9260-8i. Avago bought LSI, then Avago was bought by Broadcom, hence the Broadcom link above.
I don't think there is anything that is Intel specific that can do it either.
What you describe its officially called an Online Capacity Expansion.
You should be able to accomplish it by following the steps listed on the following article: http://www.intel.com/content/www/us/en/support/server-products/raid-products/000007571.html
If you have any other questions just let us know.
Just to add something important let me tell you that this is only possible in non-spanned volumes such as RAID 0,1, and 5. This cannot be done in RAID 10, 50 or 60. More information is listed in Software Users Guide https://www.intel.com/content/dam/support/us/en/documents/server-products/d29305023_raid_swug_r23_5.pdf
I hope you are doing well today.
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