Storage unit subsystem

Details Storage unit subsystem Storage unit subsystem

1999-02-22

2000-11-07

Iqbal, Nadeem

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

711113, G06F 1100

Patent

active

06145091&

ABSTRACT:
When receiving a write request from a processor, a control unit checks the condition of existence (or the presence/absence) in a cache for information necessary for generation of an updated value of a parity record, receives write data and reports the completion of the write request to the processor. In asynchronism with the write request from the processor, the control unit performs a load process for that information among the information necessary for generation of the updated value of the parity record which may be prepared in asynchronism with the write request from the processor and a write after process for the updated value of the parity record.

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Patterson, David A. et al, "A Case for Redundant Arrays of Inexpensive Disks (RAID), " ACM SIGMOD Conference Proceedings, Chicago, Illinois, Jun. 1-3.

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