Patent
1994-07-12
1997-03-11
Harvey, Jack B.
395498, 395489, 395181, 39518204, G06F 1310, G06F 700
Patent
active
056110693
ABSTRACT:
Even if a plurality of disk units in a disk array which operate in parallel simultaneously causes faults, a system can instantaneously cope with a processing request without losing the data. For this purpose, a mirror disk unit in which two disk units are provided as one set is used as a component element of the disk array. The two disk units of the mirror disk unit are allocated to the disk unit for the present use and the disk unit for spare. Data is written into both the presently used disk unit and the spare disk unit. Data is read out from the present use disk unit. The occurrence of a fault of the disk unit is judged and the allocation is switched from the present use disk unit to the spare disk unit. In an idle state, a simulation to check the disk array is executed and fault information is collected. RAID3 or RAID5 in which a parity is stored in the mirror disk construction can be also used. Further, the present use disk unit is not constructed as a mirror disk and when the fault is judged in the present use disk unit, the data is copied to the spare disk unit, thereby dynamically realizing a mirror disk construction.
REFERENCES:
patent: 5321826 (1994-06-01), Ushiro
patent: 5392244 (1995-02-01), Jacobson et al.
patent: 5455934 (1995-10-01), Holland et al.
Etienne Ario
Fujitsu Limited
Harvey Jack B.
LandOfFree
Disk array apparatus which predicts errors using mirror disks th 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 apparatus which predicts errors using mirror disks th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk array apparatus which predicts errors using mirror disks th will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-451624