Working with t he notebook
The operating system detects all hard disks in a disk arra y as a single physical
hard disk. The individual d isk drives in a disk array are called "members". Member
configuration information is recorded in the reserved sector of the hard disk. With this
information t he hard disk can be identified as a member.
There are u sually a few metho ds by which hard disks can be combined. These me thods
are referred to as different RAID leve ls. The different RAID levels represen t d ifferent
performance and security levels as well a s implementat ion costs.
Depending on the size of the hard disk, the process for combining two
hard drives to create a RAID group can take several hours. During this
time period, your screen will turn black.
For further information about how to configure your RAID system, refer to the
Help funct ion of the RAID Manager software on y our device.
RAID level
Number of hard disk
drives Capacity Benefits
RAID 0 (Striping)
2
Number of hard drives
x smallest size
Highest performance
without data protection
RAID 1 (Mirroring)
2
Smallest size
Data protection
SPAN (JBOD)
2
Up to 4, total of all har d
disk drives
No performance
advantages, no d ata
protection
RAID 0 (Striping)
Reads and writes secto rs of data interleaved between multiple drives.
RAID 0 d oes not support fault tolerance. If one hard drive fails, the entire
disk array is affected by the data loss.
RAID 0 is designed to deliver op timum performance. The disk array d a ta capacity is
equal to the number of ha rd disks times the smallest hard disk capacity. The block
size can be s et to be between 4 kB and 128 kB.
RAID 1 (Mirroring)
Writing identical data on b oth hard disk drives (redundancy, mirroring) and parallel reading mode.
If one of the mirrored hard disks fails or no longer reacts due to a mechanical fault, the remaining
hard disk assumes the function. This protects the data from being lost.
Due to this redundancy, the data capacity of the disk array is equivalent to
the capacity of the smallest hard disk.
A26391-K90-Z200-1-7619, edition 1 39
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