Electrical computers and digital data processing systems: input/ – Input/output data processing – Data transfer specifying
Patent
1996-09-30
1999-12-28
Matar, Ahmad F.
Electrical computers and digital data processing systems: input/
Input/output data processing
Data transfer specifying
710 3, G06F 1100
Patent
active
060094818
ABSTRACT:
A mass storage system having at least one input/output controllers in connection with a host computer is disclosed. The mass storage system also includes mirrored storage devices in connection with the input/output controllers through a global cache memory. Each mirrored pair of storage devices is assigned a common logical volume address, but is looked upon by the host computer as a single entity. The cache memory includes dynamically allocable cache slots, which correspond to each common logical volume address. When the host wishes to write data to a pair of mirrored storage devices, the contents of first write operation are written into the appropriate cache slot. However, when a second write operation is received by the input/output controllers, a determination is made as to whether the contents of the second write operation are already in the cache memory. If the contents are in the cache memory, a second write operation is not effectuated, thus improving system performance, but maintaining reliability in the system.
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Dinh Khanh Quang
EMC Corporation
Fitzgerald, Esq. Leanne J.
Gunther, Esq. John M.
Matar Ahmad F.
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