Abstract:
A storage system is provided. The storage system includes a plurality of storage units, each of the plurality of storage units having storage memory for user data and a plurality of storage nodes, each of the plurality of storage nodes configured to have ownership of a portion of the user data. The storage system includes a first pathway, coupling the plurality of storage units such that each of the plurality of storage units can communicate with at least one other of the plurality of storage units via the first pathway without assistance from the plurality of storage nodes.
Abstract:
A server chassis includes an uninterruptible power supply, and a server including a controller. The uninterruptible power supply is configured to provide a reserve power when a primary power is lost, and to send a power loss signal when the primary power is lost. The controller is configured to receive a desired server uptime, to receive an indication that a power limit for the server is fixed or decreasing over the desired server, to receive the power loss signal from the uninterruptible power supply, to send a power capacity query to the uninterruptible power supply, to receive a reserve power capacity of the uninterruptible power supply in response to the power capacity query, to calculate the power limit for the server based on the reserve power capacity of the uninterruptible power supply and on the desired server uptime, and to enforce the power limit on the server.
Abstract:
An application may store data to a dataset comprising a plurality of volumes stored on a plurality of storage systems. The application may request a dataset image of the dataset, the dataset image comprising a volume image of each volume of the dataset. A dataset image manager operates with a plurality of volume image managers in parallel to produce the dataset image, each volume image manager executing on a storage system. The plurality of volume image managers respond by performing requested operations and sending responses to the dataset image manager in parallel. Each volume image manager on a storage system may manage and produce a volume image for each volume of the dataset stored to the storage system. If a volume image for any volume of the dataset fails, or a timeout period expires, a cleanup procedure is performed to delete any successful volume images.
Abstract:
To facilitate dynamic lockstep support, replacement states and/or logic used to select particular cache lines for replacement with new allocations in accord with replacement algorithms or strategies may be enhanced to provide generally independent replacement contexts for use in respective lockstep and performance modes. In some cases, replacement logic that may be otherwise conventional in its selection of cache lines for new allocations in accord with a first-in, first-out (FIFO), round-robin, random, least recently used (LRU), pseudo LRU, or other replacement algorithm/strategy is at least partially replicated to provide lockstep and performance instances that respectively cover lockstep and performance partitions of a cache. In some cases, a unified instance of replacement logic may be reinitialized with appropriate states at (or coincident with) transitions between performance and lockstep modes of operation.
Abstract:
A method includes, in a memory controller that controls a memory, evaluating an available memory space remaining in the memory to write data. A redundant storage configuration is selected in the memory controller depending on the available memory space. Redundancy information is calculated over the data using the selected redundant storage configuration. The data and the redundancy information are written to the available memory space in the memory.
Abstract:
Examples disclose a multi-core circuit with a primary core associated with a primary portion of cache and a secondary core associated with a secondary portion of the cache. The secondary portion of the cache is redundant to the primary portion of the cache. Further, the examples of the multi-core circuit provide a control circuit to enable the secondary core for operation in response to a fault condition detected at the primary core, wherein the secondary portion of cache is enabled with the secondary core to resume an operation of the primary core.
Abstract:
Cache storage may be partitioned in a manner that dedicates a first portion of the cache to lockstep mode execution, while providing a second (or remaining) portion for non-lockstep execution mode(s). For example, in embodiments that employ cache storage organized as a set associative cache, partition may be achieved by reserving a subset of the ways in the cache for use when operating in lockstep mode. Some or all of the remaining ways are available for use when operating in non-lockstep execution mode(s). In some embodiments, a subset of the cache sets, rather than cache ways, may be reserved in a like manner, though for concreteness, much of the description that follows emphasizes way-partitioned embodiments.
Abstract:
A system and method for direct memory access (DMA) operation provides for receiving DMA requestors, assigning the received DMA requestors to one or more of a plurality of DMA engines for processing the received DMA requestors, and if one of the received DMA requestors is a safety requestor, assigning the safety requestor to at least two DMA engines of the plurality of DMA engines for processing the safety requestor, disabling a bus interface for coupling at least one DMA engine of the at least two DMA engines to memories, comparing the outputs of the at least two DMA engines, and generating an error message if the comparison of the outputs of the at least two DMA engines are different from each other.
Abstract:
An application may store data to a dataset comprising a plurality of volumes stored on a plurality of storage systems. The application may request a dataset image of the dataset, the dataset image comprising a volume image of each volume of the dataset. A dataset image manager operates with a plurality of volume image managers in parallel to produce the dataset image, each volume image manager executing on a storage system. The plurality of volume image managers respond by performing requested operations and sending responses to the dataset image manager in parallel. Each volume image manager on a storage system may manage and produce a volume image for each volume of the dataset stored to the storage system. If a volume image for any volume of the dataset fails, or a timeout period expires, a cleanup procedure is performed to delete any successful volume images.
Abstract:
First data to be written which is output from a function module (2) is supplied to a built-in memory (3) and a first buffer memory (11), and second data to be written which is output from the function module (2) is supplied to the built-in memory (3) and a second buffer memory (12). The first and second FIFO memories (13, 14) select and store data items having a predetermined number of outputs from a plurality of first and second output data items which are sequentially output from the first and second buffer memories (11, 12), and do not select other data items. A comparator (15) compares the data items having the predetermined number of outputs which are selected and are output by the first and second FIFO memories (13, 14) with each other.