[CentOS] looking for RAID 1+0 setup instructions?

> Although they work, and do the same, the installer CD & mdadm needs to
> support it. The specific appliance that I want to install, doesn't
> support RAID 10, so I need to install RAID 1 + RAID 0, i.e. setting 2x
> RAID 1 mirrors, and then stripe then in RAID0 - but once the first 1
> mirrors are setup, I can't stripe them.

Aren't you using CentOS, then? You didn't tell us that... My answer was 
based on the assumption that you were talking about CentOS...