International Business Machines Corporation

Herve G P Andre

Todd Charles Sorenson

Larry Juarez

Trung Ngoc Nguyen

Juan J Ruiz

Tony Leung

Rashmi Chandra

Clint Alan Hardy

Matthew D Carson

Brian Anthony Rinaldi

Enrique Q Garcia

Mark Elliott Hack

Liang Wu

Ricardo Sedillos Padilla

Yolanda Colpo

Micah Robison

Gary William Batchelor

Louis Alonso Rasor

Jacob Lee Sheppard

Scott A Brewer

Veronica S Davila

Igor Popov

Daniel I Ibanez

Glynis G Dsouza

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

Methods that can access a shared computing resource are provided. One method includes determining, by a processor, a level of stress for a shared computing resource during each increment of time in a predetermined period of time, determining an optimized block of time within the predetermined period of time to perform a set of background operations on the shared computing resource based on the determined level of stress, and performing the set of background operations during the optimized block of time. Apparatus and computer program products that can include, perform, and/or implement the methods are also provided.

Methods, apparatus, and computer program products for accessing a shared computing resource

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

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

Provided are a computer program product, system, and method to allocate a segment of a buffer to each of a plurality of threads to use for writing data. Each of a plurality of threads are assigned to one of a plurality of segments in a buffer, wherein the threads write to the segment to which they are assigned. A free segment list indicates segments which are not assigned to one of the threads. In response to one of the segments assigned to one of the threads becoming a full segment having less than a threshold amount of free space, indicating the full segment assigned to the thread in the free segment list and assigning one of the segments in the free segment list to the thread different from the full segment.

Allocate a segment of a buffer to each of a plurality of threads to use for writing data

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

Provided are a computer program product, system, and method for embedding and executing trace functions in code to gather trace data. A plurality of trace functions are embedded in the code. For each embedded trace function, a trace level is included indicating code to which the trace applies. The trace level comprises one of a plurality of levels. During the execution of the code, the embedded trace functions having one of the levels associated with a specified at least one level specified are executed. The embedded trace functions associated with at least one level not comprising one of the at least one specified level are not invoked.

Embedding and executing trace functions in code to gather trace data

A storage controller determines a presence of an indication from an Input/Output (I/O) enclosure that the I/O enclosure will be powered off after a predetermined amount of time. The storage controller quiesces all I/O adapters of the I/O enclosure, in response to receiving the indication. The storage controller quiesces the I/O enclosure, in response to completion of quiescing of all of the I/O adapters of the I/O enclosure.

Method, system, and computer program product for taking an I/O enclosure offline

Provided are a computer program product, system, and method for using a plurality of sub-buffers and a free segment list to allocate segments to a plurality of threads to use for writing data. Groups of threads are assigned to sub-buffers. At least one segment of data is indicated in each of the sub-buffers. The threads assigned to one of the sub-buffers write to the at least one segment indicated in the sub-buffer to which the threads are assigned. A free segment list indicates segments which are not indicated in one of the sub-buffers. In response to one of the segments in a containing sub-buffer comprising one of the sub-buffers becoming a full segment having less than a threshold amount of free space, the indication of the full segment in the containing sub-buffer is replaced with one of the segments indicated in the free segment list.

Using a plurality of sub-buffers and a free segment list to allocate segments to a plurality of threads to use for writing data

Dynamically adjust an error threshold in a data system based system status changes caused by either an external environment and/or an internal status.

Provided are a computer program product, system, and method for determining an availability score based on available resources of different resource types in a storage system to determine whether to perform a failure operation for the storage system. Information is maintained indicating availability of a plurality of storage system resources for a plurality of resource types. An availability score is calculated as a function of a number of available resources of the resource types. Information on the availability score is transmitted to a failure manager. The failure manager uses the transmitted availability information to determine whether to initiate a storage system failure mode for the storage system.

Determining an availability score based on available resources of different resource types in a storage system to determine whether to perform a failure operation for the storage system

Provided are techniques for utilization based multi-buffer self-calibrated dynamic adjustment management. A sub-buffer is assigned to each entity of multiple entities. Under control of each of the multiple entities, a current utilization rate of the entity and each other entity is summed up; a number of data segments for the entity are determined based on the current utilization rate of the entity relative to the current utilization rate of each of the other entities; and a size of the assigned sub-buffer is adjusted based on the determination.

Utilization based multi-buffer self-calibrated dynamic adjustment management

A method for dynamically changing system recovery actions based on system load. The method includes measuring a value of a workload characteristic of a computer system over a period of time, detecting an error in the computer system, determining a workload level of the computer system, and selecting a set of error recovery actions in response to the system workload analysis module determining the workload level of the computer system. A workload characteristic defines a type of work performed by the computer system. A workload level can be based on user defined parameters or a measurement of the value of one or more workload characteristics.

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Orlando, FL, United States of America

Herve G P Andre