ICP GDT RS Series, User Manual

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If you confirm with <Y> , ICPCON allows you to limit the size of the Logical Drive. This be-
comes interesting when you configure later on an Array Drive with several identical Logical
Drives and you want to make sure that you get appropriate spare hard disks in the future. It
would be bad luck if the new hard disk would have 17508MB, only. It simply wouldn't fit
into the Array Drive. If you limit the capacity
to e.g., 17000MB from the beginning, you can
be sure that all future 18GB hard disk will
have at least 17000MB and thus can be used as spare hard disk.
If you select two or more Physical Drives with SPACE, ICPCON suggest the creation of a
Logical Drive of the type
Chain . In some literature Disk Chaining is also called Disk Spanning .
You can picture the functioning mechanism of a type Chain Logical Drive as follows: all hard
disks forming the Logical Drive are linked together one by one in the exact same order in
which they have been selected with the SPACE bar. This concatenation can be compared
with a chain. If, for example, the Logical Drive consists of 4 hard disks with 2000MB each,
the Logical Drive will have a capacity of 8000MB. When data is written to this Logical Drive,
the first hard disk is filled first, then the second, and so on.
Although it is not advisable, Logical Drives of the type Chain, can also be components of
Array Drives.
J.4.6 Menu Advanced Setup: Configure Array Drives
This main menu option allows you to configure Array Drives (level of hierarchy 3).
Array Drives with the following listed RAID levels can be configured within this menu.
ƒ
RAID 0 pure data striping without redundancy
ƒ
RAID 1 disk mirroring
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RAID 4 data striping with dedicated parity drive
ƒ
RAID 5 data striping with striped parity
ƒ
RAID 10 RAID 0 combined with RAID 1
The ICP Controller can manage up to 35 Array Drives (with different RAID levels) simultane-
ously. Obviously, the physically existing number of hard disks will limit the number of par-
allel used Arrays.
F4 displays level by level detailed information on the selected
Array Drive (the structure, the order, which hard disks are part
of the Array Drive). With F5 the ICP Controller turns for a few
seconds the LEDs of all hard disks belonging to this Array
Drive periodically on and off. This may help to identify the hard
disks.
If you press ENTER on a specific Array Drive ICPCON displays a
list of possible options.