Disk array controller for performing exclusive or operations

Details Disk array controller for performing exclusive or operations Disk array controller for performing exclusive or operations

1995-10-13

1998-04-07

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

39518204, 364DIG1, G06F 1216

Patent

active

057377448

ABSTRACT:
Circuitry for performing hardware assisted XOR operations to generate parity bits for a disk array system. The circuitry includes a controller that acts as an interface between a PCI bus and a DRAM that includes a write-posting cache portion and an XOR buffer portion. The DRAM has a maximum data storage capacity, and the controller is allocated an address space that is twice the maximum storage capacity of the DRAM. The address space is divided into two portions, a normal address range and an XOR address range. A write to the normal address range produces a normal write cycle to the DRAM, while a write to the XOR address range generates a read-modify-write XOR cycle to the DRAM. In the read-modify-write XOR cycles, the read data are XORed with the write data. Selected data are cumulatively XORed to generate new parity information.

REFERENCES:
patent: 5101492 (1992-03-01), Schultz
patent: 5206943 (1993-04-01), Callison
patent: 5243699 (1993-09-01), Nickolls et al.
patent: 5388108 (1995-02-01), DeMoss
patent: 5408644 (1995-04-01), Schneider
patent: 5469566 (1995-11-01), Hohenstein et al.
patent: 5473761 (1995-12-01), Parks et al.
patent: 5522032 (1996-05-01), Franaszek
patent: 5522065 (1996-05-01), Neufeld
patent: 5613059 (1997-03-01), Stallmo et al.
patent: 5623595 (1997-04-01), Bailey
David A. Patterson, et al., "A Case for Redundant Arrays of Inexpensive Disks (RAID), Report No. UCB/CSD 87/391, Dec. 1987.

Affiliated with

Also associated with

Rating

Disk array controller for performing exclusive or operations does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk array controller for performing exclusive or operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk array controller for performing exclusive or operations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-28710