Zeroed block optimization in disk mirroring applications
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United States of America Patent
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Jun 1, 2004
Grant Date -
Jun 13, 2002
app pub date -
Dec 13, 2000
filing date -
Dec 13, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Methods for optimizing disk mirroring synchronization and write operations. Disk mirror synchronization, wherein date stored on a first storage device is duplicated on a second storage device, is performed by examining each data block contained within the first storage device and identifying data blocks that contain only zero data and data blocks containing non-zero data. Requests are sent to the second storage device to create a zeroed data block corresponding to each data block on the first disk device that contains only zero data. A copy of each data block on the first disk drive that contains non-zero data is written to the second storage device. Disk mirror write operations, wherein data written to the first storage device is duplicated on the second storage device, are optimized by intercepting write requests directed to the first storage device, and examining each data block within the write requests to determine if the data block contains only zero data. If a data block contains only zero data, a request is sent to the second storage device to create a zeroed block. If a data block contains non-zero data, the data block is transmitted to the second storage device.
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