R - Definitions

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  • R

    race condition

    A race condition is an undesirable situation that occurs when a device or system attempts to perform two or more operations at the same time, but because of the nature of the device or system, the operations must be done in the proper sequence to be done correctly.

  • rack-scale flash

    Rack-scale flash is flash-only storage that uses a high-speed interface to connect the storage more directly to the CPU than with a traditional storage array.

  • Rackspace Cloud

    Cloud provider Rackspace offers several different cloud storage services including Cloud Files, Cloud Block Storage and Cloud Backup.

  • RADOS (Reliable Autonomic Distributed Object Store)

    Reliable Autonomic Distributed Object Store (RADOS) is an object storage service with the ability to scale to thousands of hardware devices by making use of management software that runs on each of the individual nodes. RADOS is an integral part of the Ceph distributed storage system.

  • RADOS Block Device (RBD)

    A RADOS Block Device (RBD) is software that facilitates the storage of block-based data in the open source Ceph distributed storage system.

  • RAID (redundant array of independent disks)

    RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks or solid-state drives to protect data in the case of a drive failure.

  • RAID 0 (disk striping)

    RAID 0 (disk striping) is the process of dividing a body of data into blocks and spreading the data blocks across multiple storage devices, such as hard disks or solid-state drives (SSDs), in a redundant array of independent disks (RAID) group.

  • RAID 10 (RAID 1+0)

    RAID 10, also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data.

  • RAID 2

    RAID 2 is a technique that stripes data at the bit level using a Hamming code to detect errors.

  • RAID 3 (redundant array of independent disks)

    RAID 3 is a RAID configuration that uses striping and parity, but it uses a parity disk to store the parity information generated by a RAID controller instead of striping it with the data.

  • RAID 4 (redundant array of independent disks)

    RAID 4 is a RAID configuration that uses a dedicated parity disk and block-level striping across multiple disks.

  • RAID 5

    RAID 5 is a redundant array of independent disks configuration that uses disk striping with parity.

  • RAID 50 (RAID 5+0)

    RAID 50, also known as RAID 5+0, combines distributed parity (RAID 5) with striping (RAID 0).

  • RAID 6 (redundant array of independent disks)

    RAID 6, also known as double-parity RAID, uses two parity stripes on each disk. It allows for two disk failures within the RAID set before any data is lost.

  • RAID 7 (redundant array of independent disks)

    RAID 7 is a trademarked RAID level owned by the now defunct Storage Computer Corp. It is a non-standard RAID level that requires proprietary hardware.

  • RAID controller

    A RAID controller is a hardware device or software program used to manage hard disk drives (HDDs) or solid-state drives (SSDs) in a computer or storage array so they work as a logical unit.

  • RAID rebuild

    A RAID rebuild is the data reconstruction process that occurs in a redundant array of independent disks (RAID) implementation when a hard disk drive fails.

  • RAM (Random Access Memory)

    RAM (Random Access Memory) is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor.

  • RAM-based solid state drive (SSD)

    A RAM-based solid state drive is a storage device that is made from silicon microchips, has no moving parts and stores data electronically instead of magnetically.

  • RAMAC

    (IBM had an earlier system called RAMAC. See RAMAC (original).

  • RAMAC (random access method of accounting and control)

    RAMAC (which stood for 'random access method of accounting and control') was the world's first computer disk storage system... (Continued)

  • RAS (row address strobe)

    In computer memory technology, RAS (row address strobe) is a signal sent to a dynamic random access memory (DRAM) that tells it that an associated address is a row address.

  • RDRAM (Rambus DRAM)

    Rambus Dynamic Random Access Memory, or RDRAM (Rambus DRAM), is a type of computer device active memory developed and licensed by Rambus Inc.

  • read cache

    A read cache is a computer storage component that temporarily keeps a copy of data from a slower permanent storage location in order to accelerate the fulfillment of future requests for the data.

  • read-intensive SSD (read-intensive solid-state drive)

    A read-intensive solid-state drive (SSD) is a NAND flash-based storage or caching device used with applications that write data infrequently, in contrast to SSDs that target write-intensive workloads.

  • recordable DVD (writable DVD)

    Recordable DVD (sometimes called writable DVD) is a DVD technology that allows a PC user to write data one or more times to a DVD with the PC's DVD drive.

  • recovery

    In data management, recovery is a process that involves copying backup files from secondary storage (tape, Zip disk or other backup media) to hard disk.

  • Red Book

    The Red Book is the 1980 document that provides the specifications for the standard compact disc (CD) developed by Sony and Philips.

  • Red Hat OpenStack Platform

    Red Hat OpenStack Platform is a commercially supported distribution of open source OpenStack software designed to build and manage large pools of compute, storage and networking resources in public and private clouds.

  • redundant

    Redundancy can have several meanings, but commonly refers to spare hardware that is kept online or to duplicate data.

  • Remote Direct Memory Access (RDMA)

    Remote Direct Memory Access (RDMA) is a technology that allows computers in a network to exchange data in main memory without involving the processor, cache or OS.

  • RIMM

    In a computer, a RIMM is a memory module developed by Kingston Technology Corp.

  • Robson

    Robson is a mass storage system similar to a hybrid hard drive (HHD)... (Continued)

  • RRAM or ReRAM (resistive RAM)

    RRAM or ReRAM (resistive random access memory) is a form of nonvolatile storage that operates by changing the resistance of a specially formulated solid dielectric material.

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