Storage system having a host that manages physical data locations of storage device
A storage device includes a nonvolatile memory, a communication interface connectable to a host, and a controller. The controller is configured to carry out writing of data that is received through the communication interface at a physical location of the nonvolatile memory when a write command associated with the data is received through the communication interface, control the communication interface to return a first notification upon determining that the writing of data at the physical location of the nonvolatile memory has completed, and control the communication interface to return a second notification a predetermined period of time after the first notification has been returned.
1. A storage device comprising:
a nonvolatile memory;
a communication interface connectable to a host; and
a controller configured to
upon receipt of data to be written and a write command associated with the data and including an identifier from the host through the communication interface, carry out writing of the data at a physical location of the nonvolatile memory,
control the communication interface to return to the host a first notification including the identifier that is included in the received write command upon determining that the writing of data at the physical location of the nonvolatile memory has completed but before verification of the written data has been carried out, and
control the communication interface to return to the host a second notification indicating that the written data are ready for reading and including the identifier that is included in the received write command, after a predetermined period of time has passed after the first notification has been returned and the verification of the written data has been carried out.
2. The storage device according to claim 1 , wherein
the controller is further configured to carry out the verification by executing reading of the data written in the physical location of the nonvolatile memory and an error correction of the read data the predetermined period of time after the first notification has been returned, and determine whether all errors included in the read data, if any, are corrected, and
the controller controls the communication interface to return the second notification upon determining that all errors, if any, are corrected.
3. The storage device according to claim 2 , wherein
the controller is further configured to control the communication interface to return a third notification upon determining that all errors included in the read data are not corrected.
4. The storage device according to claim 1 , wherein
the controller is further configured to determine the physical location of the nonvolatile memory at which the data are to be written when the write command is received through the communication interface, and
the first notification includes the physical location, and the second notification does not include the physical location.
5. The storage device according to claim 1 , wherein
the write command includes the physical location, and
neither the first notification nor the second notification includes the physical location.
6. The storage device according to claim 1 , wherein
the controller is further configured to return a fourth notification without reading the data when a read command of the data is received through the communication interface before the second notification is returned.
7. A storage system comprising:
a storage device including a nonvolatile memory, a communication interface, and a controller; and
a host connected to the communication interface of the storage device,
the controller is configured to
upon receipt of data to be written and a write command associated with the data and including an identifier from the host through the communication interface, carry out writing of the data at a physical location of the nonvolatile memory,
control the communication interface to return to the host a first notification including the identifier that is included in the received write command upon determining that the writing of data at the physical location of the nonvolatile memory has completed but before verification of the written data has been carried out, and
control the communication interface to return to the host a second notification indicating that the written data are ready for reading and including the identifier that is included in the received write command, after a predetermined period of time has passed after the first notification has been returned and the verification of the written data has been carried out.
8. The storage system according to claim 7 , wherein
the controller is further configured to carry out the verification by executing reading of the data written in the physical location of the nonvolatile memory and an error correction of the read data the predetermined period of time after the first notification has been returned, and determine whether all errors are included in the read data, if any, are corrected, and
the controller controls the communication interface to return the second notification to the host upon determining that all errors, if any, are corrected.
9. The storage system according to claim 8 , wherein
the controller is further configured to control the communication interface to return a third notification to the host upon determining that all errors included in the read data are not corrected.
10. The storage system according to claim 8 , wherein
the host includes a write buffer memory and a processor, and
the processor is configured to
temporarily store data in the write buffer memory,
store, in a memory of the host, mapping between an identifier or a logical address for the data and the physical location of the nonvolatile memory at which the data were written, when the first notification is returned from the storage device, and
erase or trim the data stored in the write buffer memory when the second notification is returned from the storage device after the first notification.
11. The storage system according to claim 10 , wherein
the processor is further configured to transmit a secondary write command associated with the data to the storage device through the communication interface when the third notification is returned from the storage device after the first notification.
12. The storage system according to claim 10 , wherein
the processor is further configured to read the data from the write buffer memory without transmitting a read command for the data to the storage device and return the read data, when a read request for the data is received after the first notification and before the second notification.
13. The storage system according to claim 7 , wherein
the controller is further configured to determine the physical location of the nonvolatile memory at which the data are to be written when the write command is received through the communication interface from the host, and
the first notification includes the physical location, and the second notification does not include the physical location.
14. The storage system according to claim 7 , wherein
the host is configured to determine the physical location of the nonvolatile memory in which the data are to be written, and transmit the physical location along with the write command, and
neither the first notification nor the second notification includes the physical location.
15. The storage system according to claim 7 , wherein
the controller is further configured to return a fourth notification to the host without reading the data from the nonvolatile memory when a read command of the data is received through the communication interface before the second notification is returned.
16. A computing device connectable to a nonvolatile storage device, comprising:
a memory unit;
a controller communicable with the nonvolatile storage device through a communication interface of the nonvolatile storage device; and
a processor configured to
temporarily store data in the memory unit,
control the controller to transmit a write command associated with the data and including an identifier to the nonvolatile storage device through the communication interface, the write command not including address information,
store, in the memory unit, a mapping between an identifying information or a logical address for the data and a physical location of the nonvolatile memory at which the data were written, upon receipt of a first notification including the identifier that is included in the transmitted write command and indicating completion of writing the data from the nonvolatile storage device through the communication interface, and
erase or trim the data stored in the memory unit upon receipt of a second notification including the identifier that is included in the transmitted write command and indicating that the data stored at the physical location of the nonvolatile memory are ready to be read from the storage device through the communication interface after the first notification has been received.
17. The computing device according to claim 16 , wherein
the processor is further configured to transmit a secondary write command associated with the data to the nonvolatile storage device through the communication interface thereof when a third notification indicating that the data are not ready to be read is returned from the nonvolatile storage device after the first notification.
18. The computing device according to claim 16 , wherein
the processor is further configured to read the data from the memory unit without transmitting a read command for the data to the storage device and return the read data, when a read request for the data is received after the first notification and before the second notification.