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Integrated Intel® RAID Controller SROMBU42E
Intel® Server Board SE7520AF2 TPS
92
Revision
1.2
Intel order number C77866-003
Figure 24. RAID 50
4.4.6
Levels of Drive Hierarchy within the Intel® Integrated RAID Firmware
The Intel Integrated RAID firmware is based on three fundamental levels of hierarchy, as
outlined below. Logical drives are created from drive arrays that are in turn created from
physical drives.
4.4.6.1
Level 1
Physical drives are hard drives and removable hard disks. Physical drives are the basic
components of logical drives. Before they can be used by the firmware, these hard disks must
be added to an array. This process identifies a drive by its physical ID and maps it to a logical
address. For reasons of data coherency, this information is extremely important for any logical
drive construction consisting of more than one physical drive.
4.4.6.2
Level 2
On this level of hierarchy, the firmware forms the array drives. An array drive can be any of the
following:
Single drives or multiple disks
Chaining sets (concatenation of several hard disks)
RAID 0 array drives
RAID 1 array drives
RAID 5 array drives
RAID 10 array drives
4.4.6.3
Level 3
On level 3, the firmware forms logical drives. Only these drives can be accessed by the host
operating system of the computer. Drives C, D, etc., under MS-DOS*, etc., are always referred
to as logical drives by the firmware. The same applies to Novell* NetWare* and UNIX/Linux
drives. The firmware automatically transforms each newly installed drive array into a logical