This section provides instructions for configuring redundant array independent disk (RAID) arrays, and for configuring iSCSI virtual drive properties.
Redundant array of independent disks (RAID) implementations can provide increased performance and data integrity across the available disk space in the server. By mirroring data across drives, most RAID levels can tolerate disk failures. Additionally, RAID configurations enable you to designate one or more hot spares. A hot spare is an unused drive on which the data on a failed drive can be automatically duplicated. See: RAID Configuration Options
By default, each physical drive on the server is configured as a RAID 0 volume in a redundant array of independent disks (RAID). If you need to reconfigure the drives, you should do so before you install an operating system on the server.
Drives that are not included in a RAID configuration are not visible to the operating system.
If you prefer to run a supported operating system that resides on an external server, you must configure iSCSI virtual drive parameters in the BIOS Setup Utility. See: Modify iSCSI Virtual Drive Properties in UEFI Boot Mode (BIOS)