Can I add 2 more drives to my already raid 10 with 8 drives?

Hello everyone,

I have a IBM X3500 M4 7383 & ServeRAID card M5210

I have one RAID bank full of  600GB drives (8)

There is another bank (empty now) that I'm not using and I need more disk space.

Can I purchase 2 new drives of the same type and put them in 0 &1 slots?

Will the system build automatically or will I need to reconfigure another drive group and do  a complete system backup?

I appreciate any input you can provide.

Thank you

Jim