Netapp, Inc.

Micron Technology Incorporated

Western Digital Technologies, Inc.

Ritesh Tiwari

Vasantha Sadananda Prabhu

Gaurab Paul

Rushi Srinivas Surla

Sridhar Prudviraj Gunda

Konstantinos Roussos

Amiya Banerjee

Raghavendra Gopalakrishnan

Boris Teterin

Mani Raghavendra Aravapalli

Shreesha Prabhu

Raviraj R

Methods, systems, and devices for an erase operation for a memory system are described. The memory system may perform, on a block of memory cells, a first portion of an erase operation. After performing the first portion of the erase operation, the memory system may receive a write command to write data to the block of memory cells. In response to receiving the write command, the memory system may determine whether a threshold voltage of the block of memory cells satisfies a threshold. In response to determining the that the threshold voltage satisfies the threshold, the memory system may perform a second portion of the erase operation on the block of memory cells. As such, the memory system may write the data to the block of memory cells in response to performing the second portion of the erase operation.

Portioned erase operation for a memory system

Methods, systems, and devices for overlay code retrieval from a host system are described. A memory system may determine that a set of code for execution by a processor of the memory system is absent from an executable memory of the processor. The memory system may prevent the processor from retrieving the set of code from a non-volatile memory of the memory system based on the set of code being designated for retrieval from a host system. The memory system may retrieve the set of code from a memory of a host system, instead of retrieving the set of code from the non-volatile memory, based on the set of code being designated for retrieval from the host system.

Overlay code retrieval from a host system

A storage system and method are disclosed for generating a reverse map during a background operation and storing it in a host memory buffer. In one embodiment, a storage system is provided comprising a memory and a controller. The controller is configured to generate a physical-to-logical address map for at least part of the memory as a background operation and send the physical-to-logical address map to a host for storage in volatile memory in the host.

Storage system and method for generating a reverse map during a background operation and storing it in a host memory buffer

Method and system is provided to perform a plurality of checks before performing a volume based snapshot restore ('VBSR') operation. The checks may be performed by an application executed at a computing system that interfaces with a storage system. The application may determine if there are any inconsistent LUNS and foreign mapped LUNs. The application may also determine if there are any new LUNs or any new snapshots since the snapshot, which is the basis of the restore operation was created. The application may further determine if there are any backup relationships with respect to a volume that is being restored. The application takes the information and provides a report to a user. The report allows a user to ascertain the consequences of proceeding with the VBSR operation.

Method and system for volume based snapshot restore

A method, apparatus, and system of exclusive access during a critical sub-operation to enable simultaneous operations are disclosed. In one embodiment, a method of a host device includes identifying a critical sub-operation of an operation associated with a storage system, applying a lock associated with the critical sub-operation based on a type of the sub-operation, providing exclusive access of the critical sub-operation to a first instance requiring the critical sub-operation, denying other instances access to the critical sub-operation during an interval comprising a period when the first instance executes the critical sub-operation, and releasing the lock when the critical sub-operation is no longer required by the first instance. The first instance and the other instances may originate on different host devices.

Exclusive access during a critical sub-operation to enable simultaneous operations

Techniques introduced herein allow writeable PPIs to be re-used. A writeable PPI manager can make use of existing writeable PPIs to offer logical units to clients without creating additional writeable PPIs. The writeable PPI manager can determine which writeable PPIs to re-use by testing the writeable PPIs for a variety of conditions. Advantageously, re-use of remaining logical units reduces unnecessary replication of data and increased overhead costs. Resources can thereby be conserved.

System and method for re-use of writeable PPIs

According to one or more of the provisions set forth herein, data can be managed in a data storage system in an efficient manner. In one example, a first flexible copy volume of data is generated based on a snapshot copy volume of a flexible volume containing the data. The first flexible copy volume is configured to be operated upon according to a first set of operations. A second flexible copy of the data is also generated based on the snapshot copy volume. The second flexible copy volume is configured to be operated upon according to a second set of operations that differs from the first set of operations. Having a second copy of the data allows testing or other operations to be performed on the data while also maintaining an original version of the data.

Flexible copies having different sub-types

Techniques introduced herein allow writeable PPIs to be analyzed prior to deletion to determine whether or not the writeable PPIs have reached the end of their life cycle. Prior to deletion a writeable PPI manager can inspect the writeable PPI to determine whether or not the writeable PPI has reached the end of the writeable PPI life cycle. If various criteria are not met, then the writeable PPI can be determined to have not yet reached the end of its life cycle and the deletion can be prevented.

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Bengaluru, India

Ritesh Tiwari