Sandisk Technologies Inc.

Evgeny H Firsov

Brian Walter O'Krafka

Johann George

Aaron Keith Olbrich

Darpan Dinker

Harihara Kadayam

Patrick Chiu

A memory controller receives request(s) to perform a plurality of memory operations on a datastore. The memory controller batches, into a set of leaf node operations, memory operations of the plurality of memory operations that are associated with keys in a range of keys, where a leaf node in a tiered data structure stored in the datastore is assigned the range of keys. The memory controller determines whether a condition is satisfied, and, in accordance with a determination that the condition is satisfied: locates the leaf node in the datastore; stores a copy of the leaf node in a cache; modifies the cached copy of the leaf node according to the set of leaf node operations so as to obtain one or more modified leaf nodes; and writes the one or more modified leaf nodes to one or more locations in the datastore with one or more write operations.

Methods and systems for insert optimization of tiered data structures

A persistent storage device includes both persistent storage, which includes a set of persistent storage blocks, and NVRAM, and in particular a set of NVRAM blocks. The persistent storage device also typically includes a storage controller. The persistent storage device, in addition to responding to commands to write data directly to and to read data directly from persistent storage blocks is also configured to write data to specified NVRAM blocks (e.g., specified by a host NVRAM write command) and to transfer data from a specified NVRAM block to a specified persistent storage block. As a result, multiple writes to a particular persistent storage block can be replaced with multiple writes to an NVRAM block and a subsequent single write to the particular persistent storage block. This reduces the number of writes to persistent storage and also reduces the number of corresponding block erase operations.

Persistent storage device with NVRAM for staging writes

Growing community of inventors

Palo Alto, CA, United States of America

Evgeny H Firsov