Raid device for establishing a direct passage between a host...

Details Raid device for establishing a direct passage between a host... Raid device for establishing a direct passage between a host...

2000-04-12

2003-12-30

Park, Ilwoo (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S074000, C710S302000, C711S114000

Reexamination Certificate

active

06671751

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a RAID (redundant array of inexpensive disk) device, especially to a RAID system with command processing and data transmission adapting ability, whereby the buffer memory is saved and the data of new disk driver can be restored.
BACKGROUND OF THE INVENTION
The prior art RAID system, as shown in
FIG. 1
, comprises at least a host computer
10
, a host bus
12
, a RAID controller
14
connected to the host computer
10
through the host bus
12
, a plurality of hard disks
160
and
162
connected to the RAID controller
14
. The RAID controller
14
comprises at least one functional controller
142
connected to the host bus
12
and a data buffer memory
144
connected to the functional controller
142
. The host computer
10
issues request command to hard disks
160
and
162
through the RAID controller
14
for read/write operation. After the hard disks
160
and
162
are ready, the hard disks
160
and
162
send ready command to the host computer
10
through the RAID controller
14
. The data to be read or written are temporarily stored in the data buffer memory
144
to reduce transfer delay time and then dispatched to the host computer or the hard disks
160
and
162
according to the regulation of functional controller
142
.
The above described RAID system has the advantages of large storage capacity, fault tolerance, fast accessing speed, and automatic data rebuild and backup. However, the functional controller is involved in both read and write operation, the accessing speed is delayed. Moreover, considerable buffer memories are required, the cost of the conventional RAID system is high.
It is an object of the present invention to provide a RAID system with command processing and data transmission adapting ability, wherein a controller is incorporated to process command and regulate channel for data transmission such that the buffer memory is saved and cost is reduced.
It is another object of the present invention to provide a RAID system with command processing and data transmission adapting ability, wherein a data hub and a data processing unit are incorporated to automatically rebuild data with shorted time.
It is still another object of the present invention to provide a RAID system with command processing and data transmission adapting ability, wherein a data processing unit is incorporated to select data storage mode and facilitate the RAID
0
and RAID
1
architecture.
It is still another object of the present invention to provide a RAID system with command processing and data transmission adapting ability, wherein an OR gate is incorporated to a data processing unit to reduce the risk of transmission error and computer failure.
It is still another object of the present invention to provide a RAID system with command processing and data transmission adapting ability, wherein each hard disk driver is connected to a master hard disk and a slave hard disk such that two corresponding master hard disks form a master mirror RAID system and two corresponding slave hard disks form a slave mirror RAID system.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


REFERENCES:
patent: 5287462 (1994-02-01), Jibbe et al.
patent: 5740397 (1998-04-01), Levy
patent: 5740465 (1998-04-01), Matsunami et al.
patent: 5961652 (1999-10-01), Thompson
patent: 6178520 (2001-01-01), DeKoning et al.
patent: 9-22333 (1997-01-01), None

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