I assume you created only 1 group with the 4 HDDs?
If so, what you need to do is to create 2 groups, each one with 2 HDDs.
http://www.cisco.com/en/US/docs/unified_computing/ucs/3rd-party/lsi/mrsas/userguide/LSI_MR_SAS_SW_UG.pdf
Chapter 4, page 49 is where we started with the config with the C210 we got in our lab. If you have time to spare the previous info is some nice reading.
4.4.3.6 Using Manual Configuration: RAID 10, page 76
You use the Drive Group Definition screen to select drives to create drive groups.
1. Hold while selecting two ready drives in the Drives panel on the left.
5. Hold while selecting two more ready drives in the Drives panel to create a
second RAID 1 drive group with two drives.
We just followed the doc and got everything configured.
HTH
java
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HTH
java
if this helps, please rate