International Business Machines Corporation

Yongjie Gong

Yang Liu

Xue Qiang Zhou

Chao Li

Shuang Shuang Li

Mei Mei

Ning Ding

Nicolas Marc Clayton

Bo Zou

Dan Dan Wang

Gang Lyu

Jing Lan Chen

Yao Zhang

Ke Zhao Li

Hong Qing Zhou

Yao Zhou

Qiang Xie

Xu Chu Jiang

Shan Fan

Cheng Zhao

Zhi Zhi Huang

Zhen Nyu Yao

Ping Hp He

Xiao Qin Li

Provided are a computer-implemented method, system, and computer program product for multidimensional data recover. A snapshot restore request is received with at least one parameter defining at least one dimension for data recovery. At least one snapshot is reconstructed from a single continuous snapshot stream taken for a certain period of time based on the at least one parameter. A selected snapshot is received for data recovery selected from the at least one reconstructed snapshot. The selected snapshot is restored.

Multi-dimensional data recovery

A system may include a cluster and a module of the cluster. The module may include a user resource definition and a catalog server. The catalog server may maintain a configuration of the cluster.

Open-source container cluster hot plug adapter

Operating a data mirroring system comprising a primary storage and a secondary storage that maintains a synchronous copy of data in the primary storage by detecting at least one disk array of the primary storage is overdriven, determining one or more primary volumes mapped into the at least one disk array, identifying sequential read commands to the primary volumes, at least one sequential read stream comprising a series of sequential read commands to one of the primary volumes, and redirecting at least one sequential read stream to the secondary storage.

Distributing sequential read streams across synchronous mirror pairs

Embodiments of the present disclosure relate to a new approach for workload balancing in a system. A computer-implemented method comprises obtaining a configuration of a system, wherein the configuration includes a connection relationship between components in the system. The method further comprises determining a workload threshold of a given component in the components based on the configuration, wherein a workload threshold of an upstream component of the given component is associated with a workload limit of the upstream component and a workload limit of the given component. The method further comprises determining a utilization rate of the given component based at least partially on a workload amount of the given component, the workload threshold of the given component, and the workload threshold of the upstream component. Accordingly, a more accurate utilization rate of each component in a system can be determined by considering the bottleneck of other components in the system, and thus workloads of various components in the system can be balanced from the perspective of the overall system.

Workload balancing to achieve a global workload balance

In an approach to optimizing metadata management to boost overall system performance, a cache for a storage system is initialized. Responsive to receiving a cache hit from a host cache during a host I/O operation, a first metadata of a plurality of metadata is transferred to a storage cache, where the first metadata is associated with a user data from the host I/O operation, and further wherein the first metadata is deleted from the host cache. Responsive to determining that the storage cache is full, a second metadata of the plurality of metadata is destaged from the storage cache, where the second metadata is destaged by moving the second metadata to the host cache, and further wherein the second metadata is deleted from the storage cache.

Optimize metadata management to boost overall system performance

The example embodiments disclose a system and method, a computer program product, and a computer system for improving solid-state drive performance. The example embodiments may include generating, by an affinity adapter located external to the solid-state drive, a plurality of affinities for each of a plurality of data to a respective plurality of subdivisions of data of a solid-state drive, wherein each of the plurality of data is associated with a logical block address (LBA) and each of the respective plurality of subdivisions has a physical block address (PBA). The example embodiments may also include receiving a request to write first data having a first LBA to the solid-state drive, determining by the solid-state drive, at a first time, that the first data has an affinity with a particular subdivision of data of a solid-state drive based on the generated plurality of affinities, and writing the first data to a memory location of the solid-state drive, wherein the PBA of the memory location has the determined affinity.

Solid-state drive performance and lifespan based on data affinity

In a hierarchical storage system, blocks of data selected for auto-tiering migration, are selected based on dynamically adjusted group sizes. Contiguous blocks are organized into default groups. I/O activity of the blocks in a group is monitored. Based on the I/O activity, the default groups may be sub-divided into smaller sub-groups or combined into larger groups, to separate as much as practical, contiguous series of cooler blocks and contiguous series of hotter blocks into respective focused (concentrated) groups or sub-groups. The concentrated group or sub-group may then be migrated according to the average I/O activity of the included blocks. Group configurations are continually and dynamically adjusted according to changing I/O conditions.

Automatic tiering of storage using dynamic grouping

Disclosed is a computer-implemented method to increase the speed of extent migration. The method comprises determining a plurality of extents to migrate. The extents are stored in a source tier and the source tier is one tier of a tiered storage system. The method also comprises forming a first queue, wherein the first queue contains the plurality of extents to be migrated. The method further includes selecting a first extent to copy to a target tier. The copying comprises dividing the extent into a plurality of strides, forming a second queue containing the strides, selecting and copying the first stride, and removing the first stride from the second queue. The method further comprises changing a mapping table to point to the target tier, removing the first extent from the first queue, and releasing the first area of the first tier.

Increasing the speed of data migration

A method for efficiently managing extents of backup volumes in a tiered storage system is disclosed. In one embodiment, such a method includes identifying a lifespan associated with a backup volume. The lifespan indicates how long extents of the backup volume are retained in a tiered storage system before being released. The method further assigns a temperature value to the extents that determines where the extents are stored in the tiered storage system. The method utilizes the lifespan to determine the temperature value, where the temperature value is inversely proportional to the lifespan. The method places the extents on tiers of the tiered storage system in accordance with their temperature value, such that higher temperature extents are placed on higher tiers of the tiered storage system, and lower temperature extents are placed on lower tiers of the tiered storage system. A corresponding system and computer program product are also disclosed.

Growing community of inventors

Shanghai, China

Yongjie Gong