You need to read some docs.
SME 7.0 Betas install raid 1 by default if 2 drives are found and raid 5, I believe although I can't confirm it yet, if 3 of more drives are found.
There is a raidmonitor rpm installed by default. It does use mdadm. So, I suggest to test, you disconnect one of the drives, reboot and see if it screams at you.
Server-manager/workgroup to make this a PDC. Create ibays and map drives to those if you have set the ibay up correctly. Data will be saved to the ibay/files directory.
You can also join the 7.x mailing list at smeserver.sourceforge.net to keep an eye on how the development is going and to file/research bug reports.
Hope that is enough to get you started.
JB