Emc IP Holding Company LLC

Andrew Cullen

Seungjune Jeon

Haleh Tabrizi

Justin L Ha

Alan Hanson

Michael Rijo

Samuel Hudson

In general, embodiments of the technology relate to a method for characterizing persistent storage. The method includes selecting a sample set of physical addresses in a solid state memory module, where the sample set of physical addresses is associated with a region in the solid state memory module (SSMM). The method further includes issuing a write request to the sample set of physical addresses, after issuing the write request, issuing a request read to the sample set of physical addresses to obtain a copy of the data stored in the sample set of physical addresses, obtaining an error parameter for the copy of the data, determining a calculated P/E cycle value for the SSMM using at least the error parameter; and storing the calculated P/E cycle value in the SSMM.

Method and system for offline program/erase count estimation

In general, embodiments of the technology relate to a method for adjusting solid state memory write parameters. The method includes obtaining a performance goal for the solid state memory, receiving a client write request for data from a client, where the client write request comprises a logical address and data to be written. The method further includes determining a physical address corresponding to the logical address, where the physical address comprises a page number for a physical page in the persistent storage, obtaining at least one verify threshold value using the performance goal, issuing a control module program request including the data to be written and the at least one verify threshold value to a storage module, where the storage module comprises the physical page, and programming the data into the physical page of the storage module using the at least one verify threshold value.

Method and system for adapting solid state memory write parameters to satisfy performance goals based on degree of read errors

In general, the technology relates to a method for managing persistent storage. The method includes selecting a sample set of physical addresses in a solid state memory module, and performing a garbage collection operation on the sample set of physical addresses. The method further includes, after the garbage collection operation, issuing a write request to the sample set of physical addresses, issuing a request read to the sample set of physical addresses to obtain a copy of the data stored in the sample set of physical addresses, determining an error rate in the copy of the data stored using an Error Correction Code codeword or known data in the write request, determining a calculated P/E cycle value for the SSMM using at least the error rate, and updating an in-memory data structure in a control module with the calculated P/E cycle value.

Method and system for online program/erase count estimation

A method for reading data from persistent storage. The method includes receiving a client read request for data from a client. The client read request includes a logical address. The method further includes determining a physical address corresponding to the logical address, determining that the physical address is directed to an open block in the persistent storage and determining that the physical address is directed to a last closed word line of the open block. The method further includes, based on these determinations, obtaining at least one read threshold value for the reading from last closed word lines, issuing a control module read request comprising the at least one read threshold value to a storage module that includes the open block, and obtaining the data from the open block using the at least one read threshold value.

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Midleton, Ireland

Andrew Cullen