Raid controller disk write mask

Details Raid controller disk write mask Raid controller disk write mask

2005-02-17

2009-06-02

Patel, Hetul (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S112000, C711S154000

Reexamination Certificate

active

07543110

ABSTRACT:
A RAID disk array controller implements a write mask to support partial-stripe updates from a host system without expensive RAM to RAM copying and repeated disk accesses to assemble the updated stripe. New data from the host is transferred into a single buffer and a local processor tracks—by setting bits in the write mask—which segments of the target stripe are updated. The disk array is accessed to transfer the target stripe into the same buffer, but the buffer memory write enable is inhibited—responsive to the write mask—during transfer of the segments that were updated by the host. The complete, updated stripe is thus formed in a single buffer for parity calculations and write to the disk array.

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