International Business Machines Corporation

Dell Products Inc.

Michael Albert Perks

Sean Michael Sundberg

John R Stuewe

Mark D Nielsen

Kyle Gene Brown

Syama Poluri

Krishnaprasad Koladi

Ramesha He

Faizal Sn

Bharath Koushik Bangalore Suryanarayana

Kirk Allan Fritsche

Eric Michael Tunks

Walter R Carver

Shirley Lynn Martin

Donald W Gerhart

Chin-An Huang

Patrick Edward Nogay

Mark Alvin Sehorne

Ju-Hao Lee

Raji Lakshmi Akella

Sally M Tekulsky

Scott Robert Bruns

Beju Ekperigin

Methods, systems, and devices for providing computer implemented services are provided. The computer implemented services may be provided using hardware components of a data processing system. The hardware components may be positioned in a chassis that provide for access to the hardware components for replacement, expansion, and/or other purposes. To do so, the chassis may include sleds in which the hardware components are positioned. The sleds may facilitate operable connections between the hardware components using a limited number of mechanical features.

System and method for management of data processing system components

A multi-device chassis air filter characterization system includes a multi-device chassis, an air filter that is included on the multi-device chassis, and a plurality of computing devices that are housed in the multi-device chassis. Each of the computing devices determines that a current time corresponds to a predetermined air filter characterization time period and, in response, operates a cooling system in that computing device at a predetermined cooling system operating level for the predetermined air filter characterization time period. A first computing device that is included in the plurality of computing devices measures an air filtering characteristic provided by the air filter during the predetermined air filter characterization time period and, based on the air filtering characteristic, determines whether to generate an air filter replacement alert.

Multi-device chassis air filter characterization system

Systems and methods provide witness sled hardware that may be installed in a chassis and that is configurable using management resources of a chassis in which the witness sled is installed. The chassis may include data storage devices and Information Handling Systems (IHSs), each including one or more CPUs (Central Processing Units) that execute instructions that cause a respective IHS to store data redundantly to the plurality of data storage devices, such as part of a vSAN (Virtual Storage Area Network). The witness sled is configured to provide witness functions, such as arbitrating discrepancies in the redundantly stored data. The chassis includes a management controller that is configured to interface with the witness sled to set up high-speed network connections supported by the witness sled in order to configure the witness sled for providing witness functions within the vSAN, while accounting for the limited resources of the compute sled.

Systems and methods for configuration of witness sleds

Systems and methods provide witness sled hardware installed in a chassis and supported during network failures using management resources of the chassis. A chassis may include data storage devices and Information Handling Systems (IHSs), each configured to store data redundantly to the data storage devices, such as part of a vSAN (Virtual Storage Area Network). The witness sled is configured to provide witness functions, such as to arbitrate discrepancies in the redundantly stored data. The chassis also includes a chassis management controller (CMC) configured to initiate a connection with the witness sled via a management signaling pathway in response to a notification indicating a network fault in a high-speed connection used by the IHSs in communicating with the witness sled. The CMC receives witness transactions from theses IHSs and utilizes the connection initiated via the management signaling pathway to submit the transactions for processing by the witness sled.

Systems and methods for fault-tolerant witness sleds

Methods, systems, and devices for storing data are provided. To store data, a data storage system may include multiple storage nodes and a support node. Copies of data may be stored in the storage nodes. When the data stored by the storage nodes appears to be inconsistent, metadata from the support node may be used to resolve the inconsistencies. The storage nodes and support node may be integrated into a single chassis. The chassis may be a form factor compliant chassis such as a rack unit compliant chassis for mounting to rack rails.

System and method to ensure data integrity of software defined storage system

Methods and systems for managing the operation of data processing systems are disclosed. A data processing system may include a computing device that may provide computer implemented services. To provide the computer implemented services, hardware components of the data processing system may need to operate in predetermined manners. To manage the operation of the hardware components, the data processing system may cool the hardware components to dissipate heat from the hardware components. The data processing system may include a fan retention mechanism that facilitates orientation of positioning of cooling components used to dissipate the heat from the hardware components.

System and method for managing retaining cooling components in data processing systems

The present invention is a multi-protocol object distribution system. The multi-protocol object distribution system can include one or more remote procedure call (RPC) transport protocol stubs; and, a meta-stub configured to select individual ones of the RPC transport protocol stubs through which distributed object services can be provided to requesting clients in the object distribution system. The RPC transport protocol stubs can include both a default RPC transport stub, and at least one other RPC transport stub which the meta-stub can select based upon changing conditions in the object distribution system. Importantly, the meta-stub can automatically select the default RPC transport stub by default.

Multi-protocol object distribution

A method, a system, an apparatus, and a computer program product are presented for reducing synchronization waits when unique sequential identifiers are being allocated for transactions committed to a database that are occurring in a multi-threaded server environment. A transactional object containing an identifier data item is created for a transaction in an object-oriented environment. A pre-process object is then generated that contains the transactional object; when subsequently processed, the pre-process object allocates a sequential identifier value for the identifier data item. The pre-process object is added to a list of pre-process objects that are to be processed prior to completing the transaction, such as committing the transaction to a database. After some initial business logic processing, a commit operation for the transaction is commenced during which the pre-process object is processed, thereby allocating a sequential identifier value for the identifier data item just prior to committing the transaction.

Method and system for reducing synchronization waits when allocating sequenced identifiers in a multi-threaded server

A method, a system, an apparatus, and a computer program product are presented for object-oriented management of serializable objects. An object has a set of attributes and a class version number, which identifies the object as an instance of a specific version of a class. In addition, each attribute in the object has an attribute version number, which may represent a version of a class in which the associated attribute was initially declared within the class. The object may be serialized into a data stream, and the data stream has the class version number of the object, an attribute value for each attribute in the set of attributes, and an attribute version number for each attribute in the set of attributes. The data stream may also have a class identifier for the class of the object and an attribute count for the set of attributes into the data stream.

Method and system for maintaining forward and backward compatibility in flattened object streams

A method, system, and computer program product are described for storing attribute data in an object oriented environment. A base class and a subclass are defined within an object. The object is defined within the object oriented environment. An attribute is defined within the subclass. The attribute data defined for the subclass is stored within the base class. The attribute data is not stored within the subclass.

Method, system, and product for storage of attribute data in an object oriented environment

An apparatus and method for maintaining object associations in an object oriented environment is provided. The apparatus and method make use of value holders to enable a single method to perform the creation and/or update of object associations for all combinations of possible object associations including one to one associations, one to many associations, many to one and many to many associations.

Apparatus and method for maintaining object associations in an object oriented environment

A method and system are described in a data processing system including a database for efficiently retrieving copies of data rows from the database. Query criteria is received by a server from a client which specifies search criteria describing data rows and which requests a particular number of the data rows to return. Each of the data rows is associated with a unique primary key which uniquely identifies a particular data object. The primary key for each of the data rows meeting the specified criteria is first retrieved from the database by the server. Thereafter, copies of only the particular number of the data rows are retrieved from the database using the primary keys. Copies of only the particular number of data rows are then returned to the requesting client.

Pre-load cursor in a database method and system

A method for determining what records have been added, deleted or changed in a database uses primary keys and CRCs to make the determination. A first snapshot is taken of a record, the record retrieved, converted into characters, if necessary, and concatenated to produce a long string. A CRC code is calculated for the string. The CRC and the primary key for the record are stored. The CRC is compared with a subsequent CRC for a second snapshot of the record and a subsequent primary key. Comparing the two primary keys and the two CRCs allows determination of whether the record has been deleted, added or changed. If the first and second primary keys do not match, or if the first and second primary keys match and the CRCs do not match, the record is processed according to the particular application to be applied. The process is repeated for all records in the database.

Database deltas using Cyclic Redundancy Checks

A semaphore manager data structure for managing semaphores in a multi-tasking computer system is disclosed. The data structure comprises of a multiple of indices corresponding to each class, a multiple of semaphore numbers corresponding to each semaphore, and a mapping table defining an assignment of each of the semaphores to each of the classes by utilizing the class indices and the semaphore numbers. The assignment criteria is that a class can only be assigned to one semaphore but a semaphore can be assigned to more than one class.

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Austin, TX, United States of America

Michael Albert Perks