Hi,
since version 4 UCS is using the standard Debian installer which already has the ability to configure Software-RAID.
You have to use the “Manual” mode to configure the disks. Once there is a partition table on both disks you will see a “Configure software RAID” entry.
I dont think there is urgent need for a special documentation on UCS as one can follow existing information like the standard Wheezy-docs or summaries like installation of debian wheezy on mdadm raid1 + gpt.
Best Regards,
Dirk Ahrnke