International Business Machines Corporation

Scott A Brewer

Gregory Tad Kishi

Joseph W Dain

Theodore Timothy Harris, Jr

Raul Eduardo Saba

Sara Megan Coronado

Stephen LaRoux Blinick

Matthew J Kalos

David F Craddock

Matthias Klein

Trung Ngoc Nguyen

Yu-Cheng Hsu

Eric N Lais

Chiahong Chen

Todd Charles Sorenson

Brian Anthony Rinaldi

Enrique Q Garcia

Micah Robison

Brian D Hatfield

Gary William Batchelor

Louis Alonso Rasor

Herve G P Andre

Veronica S Davila

Radha K Ramachandran

Daniel Anson Heffley

Herve Gilbert Philippe Andre

Drew Olson

Daniel I Ibanez

A method and/or system of managing metadata are disclosed that include connecting a source data storage system (DSS) that stores both data and metadata to a metadata management platform (MMP); scanning metadata records onto the MMP from the DSS; storing metadata attributes for at least one of the group consisting of directories and buckets on the DSS in a look-up table on the MMP; and adding updated metadata attributes to the look-up table on the MMP for each subsequent scan of the DSS.

Custom metadata tag inheritance based on a filesystem directory tree or object storage bucket

A method includes generating a table in a relational database, the table comprising an empty column reserved for a custom tag. The column has a default column name. The method also includes, in response to an instruction to create the custom tag, generating a column mapping that maps a name of the custom tag to the column name. The column mapping is stored outside the relational database and is used by a parser to translate between the name of the custom tag and the column name.

Custom tag definition and translation in a database

Systems and methods for storing nodes, preferably, leaf nodes, of a data tree structure into storage are disclosed, and in one or more aspects restoring the leaf nodes from storage, preferably to memory. Copying the nodes into storage includes in an embodiment share-latching a first node of a data tree to be copied; copying the first node that is share-latched into storage; determining if there is a sibling second node linked to the first node; following a link between the first copied node and the sibling second node, share-latching the sibling second node, unlatching the first copied node, and copying the sibling second node into storage. Restoring includes copying the leaf nodes from storage, updating the leaf nodes, and creating/recreating the data tree.

Data tree checkpoint and restoration system and method

Systems and methods for metadata tag inheritance are disclosed. The methods include maintaining a plurality of data storage systems in communication with an external metadata management system, operating the metadata management system to store metadata corresponding to data residing on the data storage systems as a plurality of entries, detecting an execution of a data operation command on data residing in a data storage system that causes movement of a data set from that data storage system to a destination data storage system that is different from that data storage system, and operating the metadata management system to create a new metadata entry corresponding to the execution of the data operation command. Each of the plurality of entries may include one or more custom tags, and the new metadata entry may include at least one custom tag created before the execution of the data operation command.

Methods and systems for metadata tag inheritance between multiple storage systems

Systems and methods for metadata tag inheritance during backup are disclosed. The method includes maintaining a plurality of data storage systems in communication with an external metadata management system, operating the metadata management system to store metadata corresponding to data residing on the data storage systems as a plurality of entries that include or more custom tags, detecting an execution of a backup data operation command on data residing in a data storage system that causes creation of a backup copy of a data set in that data storage system in a destination data storage system, and operating the metadata management system to create a new metadata entry corresponding to the execution of the backup data operation command in response to detecting the execution of the backup data operation command. The new metadata entry includes at least one custom tag created before the execution of the backup data operation command.

Methods and systems for metadata tag inheritance for data backup

Systems and methods for metadata tag inheritance are disclosed. The methods include maintaining a plurality of data storage systems in communication with an external metadata management system, operating the metadata management system to store metadata corresponding to data residing on the plurality of data storage systems as a plurality of entries, detecting an execution of a data operation command in a data storage system that causes movement of a data set from source storage location to a destination storage location in that data storage system, and operating the metadata management system to create a new metadata entry corresponding to the execution of the data operation command in response to detecting the execution of the data operation command. Each of the plurality of entries includes one or more custom tags, and the new metadata entry includes at least one custom tag created before the execution of the data operation command.

Methods and systems for metadata tag inheritance between multiple file systems within a storage system

Systems and methods for metadata tag inheritance are disclosed. The methods include maintaining a plurality of data storage systems including at least one tiered data storage system in communication with an external metadata management system, operating the metadata management system to store metadata corresponding to data residing on the plurality of data storage systems as a plurality of entries, detecting an execution of a data operation command in the tiered data storage system that causes movement of a data set from a source storage tier to a destination storage tier, and in response to detecting the execution of the data operation command, operating the metadata management system to create a new metadata entry corresponding to the execution of the data operation command. The new metadata entry includes at least one custom tag created before the execution of the data operation command.

Methods and systems for metadata tag inheritance for data tiering

A computer-implemented method for computer-implemented method for communicating completion of synchronous input/output (I/O) commands between a processor executing an operating system and a recipient control unit is described. The method may include issuing, by a processor, a Synchronous I/O command to the recipient control unit; receiving, with the processor, a DMA read request from the recipient control unit; converting, with the processor, the DMA read response to write a data record into memory of the recipient control unit; issuing the DMA read request to the recipient control unit, wherein the DMA read request comprises an echo read portion comprising at least one byte of information at the end of the data record written; receiving, by the processor, a DMA write confirmation comprising the echo read portion of the record; and writing the echo read portion to a status area.

Synchronous input / output hardware acknowledgement of write completions

A computer-implemented method for synchronous input/output (I/O) cache line padding is described. The cache line padding occurs between a server having a processor executing an operating system and a recipient control unit. The method can include receiving, via the processor at the recipient control unit, a partial line direct memory access (DMA) write request; fetching, via the processor, a device table entry (DTE) associated with the partial line DMA write request; determining, via the processor, a cache line size for a synchronous input/output (I/O) cache line; and writing a full cache line DMA write request by padding, via the processor, the partial line DMA write request with a padded portion, where the padded portion is based on the cache line size.

Synchronous input/output (I/O) cache line padding

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

A standby server, a first main server, and a second main server to control shared input/output (I/O) adapters in a storage system are provided. The standby server is in communication with the first main server and the second main server, and the storage system is configured to operate as a dual node active system. The standby server is activated in response to receiving a communication from the first main server of a fail mode of the second main server. Systems and physical computer storage media are also provided.

Method and system for using a standby server to improve redundancy in a dual-node data storage system

A sleep function capable of putting a fixed high-priority thread to sleep within a time-window is disclosed. After a sleep request has been made by a fixed high-priority thread via the sleep function, a determination is made whether or not the fixed high-priority thread is awoken before a requested sleep duration under the sleep request. If the fixed high-priority thread is awoken before the requested sleep duration, the number of tasks for the fixed high-priority thread to perform is increased in order to delay the start sleep time of the fixed high-priority thread from a point within a first time-window in which the sleep request was made to an end boundary of the first time-window.

Method and apparatus for adjusting sleep time of fixed high-priority threads

In one aspect of the present description, in response to detection of a failure of a root server of a storage controller, a switch for input/output adapters may be reconfigured to report errors to a successor root server without reinitializing the input/output adapters. Other features and aspects may be realized, depending upon the particular application.

Error routing in a multi-root communication fabric

A method of providing error notification in a storage subsystem includes writing a first defined value by a host adapter of the storage subsystem to a system management interrupt (SMI) register to generate a hardware interrupt, registering and handling the hardware interrupt by a kernel module of the storage subsystem, writing a second defined value to a shared memory location of the storage subsystem by the kernel module, and reading a shared memory offset value by the host adapter. A system for providing error notification in a storage subsystem includes a controller including a serial management interface (SMI) register subcomponent, a first processing component connected to the controller having a kernel module, and a second processing component connected to the controller executing host adapter software.

Growing community of inventors

Vail, AZ, United States of America

Scott A Brewer