International Business Machines Corporation

Razik S Ahmed

Roman Alexander Pletka

Nikolas Ioannou

Timothy J Fisher

Sasa Tomic

Aaron Daniel Fry

Lincoln T Simmons

Jason Szecheong Ma

Matthew R Orr

Charles John Camp

Shawn P Authement

Adam C Chunn

Kevin A Bosien

Justin C Haggard

Jake E Miller

Yves A Santos

A technique for garbage collection in a storage system includes generating regrouping metadata for one or more pages of at least two logical erase blocks (LEB). The regrouping metadata indicates an associated stream for each of the pages. Multiple of the LEBs that include valid pages associated with a first stream are selected, based on the regrouping metadata, for regrouping. The valid pages associated with the first stream from the selected LEBs are regrouped into a new LEB.

Regrouping data during relocation to facilitate write amplification reduction

A technique for garbage collection in a data storage system includes determining a dirty physical byte count for each of a plurality of candidate garbage collection units. The dirty physical byte count provides a total amount of dirty bytes. At least one of a dirty physical codeword container count and a dirty physical page count is determined for each of the candidate garbage collection units. The dirty physical codeword container count provides an amount of physical codeword containers that are completely dirty and the dirty physical page count provides an amount of physical pages that are completely dirty. A garbage collection unit, included in the candidate garbage collection units, is selected for garbage collection based on the dirty physical byte count and at least one of the dirty physical codeword container count and the dirty physical page count.

Garbage collection techniques for a data storage system

In a data storage system, a hierarchical data structure, such as a file system or a database, is utilized to organize a hierarchical arrangement of device containers corresponding to various device identifiers of the plurality of hardware components in the target hardware system, scripts corresponding to various packet types of communication packets in the target hardware system, and responses corresponding to various packet data in the communication packets in the target hardware system. In response to receipt by a hierarchical emulation engine of a communication packet during emulation of the target hardware system, the communication packet including a device identifier, packet type and packet data, a response to the communication packet is determined by traversing the hierarchical arrangement based on the device identifier, packet type and packet data of the communication packet. The determined response is then provided.

Scriptable hierarchical emulation engine

Growing community of inventors

Houston, TX, United States of America

Razik S Ahmed