US 11,024,336 B1Granted

Magnetic disk device and memory management method of magnetic disk device

AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation

InventorsNaota Muguruma, Kenji Yoshida, Kazuya Takada

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Abstract

According to one embodiment, a magnetic disk device includes a magnetic disk, an actuator, a nonvolatile memory, and a controller. When a first determination condition of whether a total value of an amount of data for which execution completion has not been notified in one processing thread that executes a write command, the data having not been written to the magnetic disk, and an amount of the data for which execution completion has been notified in another processing thread that executes the write command, the data having not been written to the magnetic disk, is less than or equal to a capacity of the nonvolatile memory holds, the controller notifies the host of execution completion of the write command in the one processing thread.

Claims12

Dependent claims

A magnetic disk device comprising:

a magnetic disk;
an actuator that writes data to the magnetic disk;
a nonvolatile memory that saves the data that is not written to the magnetic disk;
and
a controller that controls the actuator and the nonvolatile memory, executes a write command for instructing the writing of the data to the magnetic disk, the write command being transmitted from a host, and notifies the host of execution completion of the write command, wherein
when a first determination condition of whether a total value of an amount of the data for which execution completion has not been notified in a processing thread that executes the write command, the data having not been written to the magnetic disk, and an amount of the data for which execution completion has been notified in another processing thread that executes the write command, the data having not been written to the magnetic disk, is less than or equal to a capacity of the nonvolatile memory holds, the controller is configured to notify the host of execution completion of the write command in the processing thread.

3 more elements

The memory management method of a magnetic disk device, comprising:

acquiring an amount of data for which execution completion has not been notified in a processing thread that executes a write command for instructing writing of the data to the magnetic disk, the write command being transmitted from a host, the data having not been written to the magnetic disk;
acquiring an amount of the data for which execution completion has been notified in another processing thread that executes the write command, the data having not been written to the magnetic disk;
determining a first determination condition of whether a total value of these amounts of the acquired data is less than or equal to a capacity of the nonvolatile memory;
and
when the first determination condition holds, notifying the host of execution completion of the write command in the processing thread.

2 more elements

Dependencies are inferred from the claim text.