Greg in my 6419 class today asked a great question when we covered Bitlocker. He had wondered that on a server class machine can you use it in a software or hardware RAID? I found this definitive answer in TechNet! As shown below, only hardware RAID sets are supported.
 

What type of disk configurations are supported by BitLocker?

In Windows Server 2008 R2, Windows Server 2008, and Windows 7, any number of internal, fixed data drives can be protected with BitLocker. ATA and SATA-based, direct-attached storage devices are also supported. The following table details which disk configurations are supported and not supported by BitLocker.

 

Drive configuration Supported Not supported

Network

None

Network file system (NFS)

Distributed File System (DFS)

Optical media

None

CD file system (CDFS)

Live File System

Universal Disk Format (UDF)

Software

Basic volumes

Software-based RAID systems

Bootable and non-bootable virtual hard disks (VHDs)

Dynamic volumes

RAM disks

File system

NTFS

FAT16

FAT32

ExFAT

CD File system

Drive connection

USB

Firewire

SATA

SAS

ATA

IDE

SCSI

iSCSI

Fiber Channel

eSATA

Bluetooth

Device type

Solid state drives, such as USB flash drives

Hardware-based RAID systems

Hard disk drive

None

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