Hybrid-HDD policy for what host-R/W data goes into NAND
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United States of America Patent
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Jul 11, 2017
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app pub date -
Sep 17, 2014
filing date -
Sep 17, 2014
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Abstract
In a cache policy for a hybrid drive having a magnetic storage device and a non-volatile solid-state device, the hybrid drive is configured to write the most recent version of data associated with a logical block address to the non-volatile solid-state device when the logical block address is associated with previously written data and is overlapped by a subsequent disk write operation. Advantageously, the most recent version of data associated with the overlapped logical block address is stored in cache in the non-volatile solid-state device, even when the subsequent disk write operation results in the overlapped logical block address being trimmed from cache or otherwise invalidated. Consequently, data associated with the overlapped logical block address can be accessed more quickly than data written to the magnetic storage device.
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