Apparatus for controlling data writing into a disk array system

Details Apparatus for controlling data writing into a disk array system Apparatus for controlling data writing into a disk array system

1996-04-16

1997-12-09

Chan, Eddie P.

395482, G06F 1202

Patent

active

056969333

ABSTRACT:
When an amount of write data instructed by an upper-level system is small, a plurality of disk units are accessed individually and data split in sectors is written therein (Level 5 RAID). When an amount of write data instructed by the upper-level system is large, the plurality of disk units are accessed in parallel and data split in sectors is written therein (Level 3 RAID). When a disk unit in an array, to which a setup instruction is issued according to a processing request sent from the upper-level system, returns a fault reply, an ID management table is used to allocate an auxiliary disk instead of the failing disk unit. After the allocation, data is restored to the replacement disk using the data in normal disk units in the same rank. In a dual-port access configuration, when two transactions access disk units connected to the same port, a deadlock may occur depending on the access procedure. It is checked if the conditions for a deadlock are established, so that access will be obtained according to a procedure for preventing or avoiding a deadlock.

REFERENCES:
patent: 5088081 (1992-02-01), Farr
patent: 5148432 (1992-09-01), Gordon et al.
patent: 5166936 (1992-11-01), Ewert et al.
patent: 5182808 (1993-01-01), Bagnoli et al.
patent: 5278838 (1994-01-01), Ng et al.
patent: 5303244 (1994-04-01), Watson
patent: 5315602 (1994-05-01), Noya et al.
patent: 5345565 (1994-09-01), Jibbe et al.
patent: 5375217 (1994-12-01), Jibbe et al.
patent: 5379417 (1995-01-01), Lui et al.
patent: 5404487 (1995-04-01), Murata et al.
patent: 5454085 (1995-09-01), Gajjar et al.
patent: 5519844 (1996-05-01), Stallmo
patent: 5572699 (1996-11-01), Kamo et al.
Paterson, et al., A Case for Redundant Arrays of Inexpensive Disks (RAID), 1988, pp. 109-116.

Affiliated with

Also associated with

Rating

Apparatus for controlling data writing into a disk array system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for controlling data writing into a disk array system , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for controlling data writing into a disk array system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1615744