International Business Machines Corporation

International Business Corporation

Larry Juarez

Todd Charles Sorenson

David Montgomery

Paul Anthony Jennas, Ii

Jason Lee Peipelman

Joshua M Rhoades

Herve G P Andre

Brian Anthony Rinaldi

Enrique Q Garcia

Matthew D Carson

Yolanda Colpo

Philip Matthew Doatmas

Tony Leung

Michael Robert Groseclose, Jr

John Charles Elliott

Rashmi Chandra

Clint Alan Hardy

Matthew J Kalos

Trung Ngoc Nguyen

Louis Alonso Rasor

Mark Elliott Hack

John Norbert McCauley

Ronald David Martens

Brian Sean McCain

Wang Ping He

David V Valverde

Sean Patrick Riley

Jay T Kirch

Kenny Nian Gan Qiu

Gary William Batchelor

Ya-Huey Juan

Philip Matthew Dudas

Brian C Kraemer

Mann Du

Su Qin

Ji Qiu Xu

Liang Wu

Dale Huber Anderson

Jacob Lee Sheppard

Ricardo Sedillos Padilla

Dale Howard Anderson

Michael R Groseclose, Jr

Karl Allen Nielsen

Matthew John Ward

Joshua J Crawford

Steven Mark Groff

David Fei

Jiwu Duan

Igor Popov

Maoyun Tang

Joseph Dean Ohrazda

Glynis G Dsouza

David Montogmery

David Victorino Valverde

Kenny Nian Qiu

Provided are a computer program product, system, and method for a computer program product, system, and method for determining an availability score based on available resources of different resource types in a distributed computing environment of storage servers to determine whether to perform a failure operation for one of the storage servers. A health status monitor program deployed in the storage servers performs: maintaining information indicating availability of a plurality of storage server resources for a plurality of resource types; calculating an availability score as a function of a number of available resources of the resource types; and transmitting information on the availability score to a management program. The management program uses the transmitted information to determine whether to migrate services from the storage server from which the availability score is received to at least one of the other storage servers in the distributed computing environment.

Determining an availability score based on available resources at a first server to determine whether to direct processing from a first server to a second server

A method for improving I/O response times in a data replication environment is disclosed. In one embodiment, such a method includes receiving, at a primary storage system, a request to read data on the primary storage system. The method starts a timer upon receiving the request. In the event the data cannot be retrieved from the primary storage system by the time the timer expires, the method requests the data from a secondary storage system. In the event the primary storage system returns the data before the secondary storage system, the method returns data retrieved from the primary storage system to a host system. In the event the secondary storage system returns the data before the primary storage system, the method returns the data retrieved from the secondary storage system to the host system. A corresponding system and computer program product are also disclosed.

I/O response times in data replication environments

In accordance with one aspect of the present description, a node of the distributed computing system has multiple communication paths to a data processing resource lock which controls access to shared resources, for example. In this manner, at least one redundant communication path is provided between a node and a data processing resource lock to facilitate reliable transmission of data processing resource lock signals between the node and the data processing resource lock. Other features and aspects may be realized, depending upon the particular application.

Data processing lock signal transmission

Event detection logic detects events which may be associated with a change in risk of potential data loss in a data replication system. Mode selection logic is responsive to detection of such an event to select a data replication mode such as a synchronous data replication mode, for example, as a function of a detected event for initiation of a switch to the selected mode. In one embodiment, upon detecting that the event which lead to initiation of a switch to the synchronous mode has been completed or otherwise resolved, the mode selection logic can initiation of a switch of the data replication mode of multi-mode data replication logic back to an asynchronous mode so that data is replicated in the asynchronous data replication mode. Other features and aspects may be realized, depending upon the particular application.

Multi-mode data replication for data loss risk reduction

Provided are a method, a system, and a computer program product in which a storage controller determines one or more resources that are impacted by an error. A cleanup of tasks associated with the one or more resources that are impacted by the error is performed, to recover from the error, wherein host input/output (I/O) operations continue to be processed, and wherein tasks associated with other resources continue to execute.

Recovery mechanisms across storage nodes that reduce the impact on host input and output operations

Power line disturbance hold up times are dynamically adjusted based on battery capacity of a plurality of batteries in a plurality of racks upon determining an amount of the power line disturbance one of the plurality of racks, having a fewest number of remaining batteries of the plurality of batteries with the battery capacity, is able to support.

Dynamically adjusting power disturbance hold up times

Determining an availability score based on available resources of different resource types in a cloud computing environment of storage servers providing cloud services to customers in the cloud computing environment to determine whether to perform a failure operation for one of the storage servers

In one aspect, multiple data path error collection is provided in a storage management system. In one embodiment, an error condition in a main data path between the storage controller and at least one of a host and a storage unit is detected, and in response, a sequence of error data collection operations to collect error data through a main path is initiated. In response to a failure to collect error data at a level of the sequential error data collection operations, error data is collected through an alternate data path as a function of the error data collection level at which the failure occurred. Other aspects are described.

Multiple path error data collection in a storage management system

A data storage subsystem having a plurality of data compression engines configured to compress data, each having a different compression algorithm. A data handling system is configured to determine a present rate of access to data; select at least one sample of data; determine the greatest degree of compression of said data compression engines; determine the compression ratios of the operated data compression engines with respect to the selected sample(s); compressing said selected at least one sample with a plurality of said data compression engines at said selected tier; operate a selected data compression engines with respect to the selected sample and determine the greatest degree of compression of the data compression engines; compress the data from which the sample was selected with one of the operated data compression engines determined to have the greatest degree of compression; and store the compressed data in data storage repositories.

Data compression algorithm selection and tiering

For efficient data system error recovery, an error threshold is dynamically adjusted from a default error threshold to one of a plurality of error threshold values comprising at least high threshold values, medium threshold values, and low threshold values, for a particular error associated with an event object indicating a responsive action for handling the particular error in a data system. The responsive action to the event object comprises determining whether the error threshold needs to be adjusted for the particular error, and if it is determined the error threshold for the particular error does not need adjustment, the default error threshold is used.

Efficient data system error recovery

A read/write ratio for each of a plurality of data segments classified in a hot category as hot data segments is determined. Each of the plurality of hot data segments is ordered by the read/write ratio in a descending order. Each of a plurality of available SSD devices is ordered by a remaining life expectancy in an ascending order. Those of the plurality of hot data segments are matched with those of the plurality of hot data segments with those of the plurality of available SSD devices such that a hot data segment having a higher read/write ratio is provided to an SSD device having a smaller remaining life expectancy than another hot data segment having a lower read/write ratio.

Sub-lun input/output profiling for SSD devices

A method for reducing stress on a RAID under rebuild is disclosed herein. In one embodiment, such a method includes performing the following actions while the RAID is undergoing a rebuild process: (1) redirect writes intended for the RAID to a temporary storage area located on a same primary storage system as the RAID, and (2) redirect reads intended for the RAID to a secondary storage system configured to store a copy of data in the RAID. The method is further configured to perform the following actions upon completing the rebuild process: (3) update the rebuilt RAID to reflect writes made to the temporary storage area during the rebuild process, and (4) redirect reads and writes to the rebuilt RAID. A corresponding system and computer program product are also disclosed.

Reducing stress on RAIDS under rebuild

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Tucson, AZ, United States of America

Larry Juarez