Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2005-08-09
2005-08-09
Lane, Jack A. (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C714S052000, C714S054000
Reexamination Certificate
active
06928515
ABSTRACT:
A system and associated method efficiently complete write commands in an ISF disk drive/RAID system with minimal disk accesses to the underlying disk drives. The system updates data in a parity-based disk array system by receiving a write command to write new data. The present system minimizes the number of disk accesses. The present system completes the same or comparable write commands in a total of four accesses to the disk drives. This is realized by combining the read-modify-write operation of updating one or more sectors in an ISF cluster with the read-modify-write operation associated with updating one or more sectors in a parity-based array system, such as a RAID-5 system.
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Hassner Martin Aureliano
Hetzler Steven R.
Ng Spencer W.
International Business Machines - Corporation
Kassatly Samuel A.
Lane Jack A.
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