Adaptive power failure recovery

Details Adaptive power failure recovery Adaptive power failure recovery

1997-01-30

1999-03-30

Hua, Ly

39518204, 39518218, G06F 1100

Patent

active

058899332

ABSTRACT:
A RAID system that uses non-volatile random access memory (NVRAM) to greatly reduce the chance of loss of data due to an AC power failure. This RAID system has two write modes. In a normal write mode, a host computer receives a write confirmation once an array controller receives data from the host computer. In a safe write mode, however, the array controller copies to NVRAM all data received from the host computer for writing to disk drives. In this safe write mode, the array controller sends the write confirmation to the host computer only after storing the data in NVRAM. To switch appropriately between the normal and safe write modes, the array controller polls a power-out flag provided by a UPS (uninterruptable power supply) to determine whether there has been an AC power failure. The array controller switches between the two write modes depending on the status of the power-out flag.

REFERENCES:
patent: 4323987 (1982-04-01), Holtz et al.
patent: 4506323 (1985-03-01), Pusic et al.
patent: 4712195 (1987-12-01), Finger
patent: 4763333 (1988-08-01), Byrd
patent: 4882711 (1989-11-01), Guillot
patent: 4959774 (1990-09-01), Davis
patent: 4965828 (1990-10-01), Ergott et al.
patent: 5204963 (1993-04-01), Noya et al.
patent: 5208813 (1993-05-01), Stallmo
patent: 5235601 (1993-08-01), Stallmo
patent: 5241508 (1993-08-01), Berenguel et al.
patent: 5359569 (1994-10-01), Fujita et al.
patent: 5379417 (1995-01-01), Lui et al.
patent: 5381554 (1995-01-01), Langer et al.
patent: 5410713 (1995-04-01), White et al.
patent: 5414861 (1995-05-01), Horning
patent: 5530948 (1996-06-01), Islam
patent: 5533190 (1996-07-01), Binford et al.
patent: 5586291 (1996-12-01), Lasker et al.
Article by Paul Massiglia, entitled "The Raidbook" published by The Raid Advisory Board Aug. 8, 1994, pp. Title page, II, V, VI, 130, 131.
Article by The Raid Advisory Board entitled "The RaidPrimer" First Edition, published, Mar. 1994, pp. 3 sheets.
Article by Product Preview, DS1345YLPM/ABLPM Copyright .COPYRGT. 1993, Dallas Semiconductor Corporation.
Article by Product Preview, DS1330YLPM/ABLPM, Copyright .COPYRGT. 1993, Dallas Semiconductor Corporation.

Affiliated with

Also associated with

Rating

Adaptive power failure recovery does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive power failure recovery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive power failure recovery will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1222591