Primary storage capacity optimization Definitions

  • A

    automated storage tiering (AST)

    Automated storage tiering (AST) is a storage software management feature that dynamically moves information between different disk types and RAID levels to meet space, performance and cost requirements.

  • C

    capacity optimization (CO)

    Capacity optimization (CO) is a technique for getting more data on a storage medium by analyzing the data for unique repetitive patterns that can be stored as and reassembled from shorter symbols.

  • clustered file system (CFS)

    Clustered file systems are file systems that run on multiple storage servers and can be accessed and managed as a single system.

  • column address strobe

    In computer memory technology, CAS (column address strobe) is a signal sent to a dynamic random access memory (DRAM) that tells it that an associated address is a column address. A data bit in DRAM is stored in a cell located by the intersection of a column address and a row address. A RAS (row address strobe) signal is used to validate the row address.

  • D

    data reduction in primary storage (DRIPS)

    Data reduction in primary storage (DRIPS) is the application of capacity optimization techniques for data that is in active use.

  • E

    erasure coding

    Erasure coding (EC) is a method of data protection in which data is broken into fragments, expanded and encoded with redundant data pieces and stored across a set of different locations or storage media.

  • F

    fat provisioning (FP)

    Fat provisioning (FP) is the conventional storage provisioning model, in which space is allocated beyond current needs, in anticipation of growing need and increased data complexity... (Continued)

  • H

    helical scan

    Helical scan is a way of recording information onto magnetic tape.

  • N

    nano-storage

    Nano-storage is a nanotechnology approach to storage that seeks to radically increase storage capacities through a variety of technologies, and, ultimately, to replace current storage media with extremely high-density media and devices.

  • P

    pixie dust or antiferromagnetically-coupled (AFC) media

    Pixie dust is the informal name that IBM is using for its antiferromagnetically-coupled (AFC) media technology, which can increase the data capacity of hard drives to up to four times the density possible with current drives.

  • primary storage (main storage or primary memory)

    Definition: In the enterprise, primary storage holds data that is in active use.

  • S

    storage utilization

    Storage utilization is a measure of how well the available data storage space in an enterprise is used.

  • T

    thin provisioning (TP)

    Thin provisioning (TP) is a method of optimizing the efficiency with which the available space is utilized in storage area networks... (Continued)

  • V

    volume manager

    A volume manager is software within an operating system (OS) that controls capacity allocation on arrays.

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