Hesela / Structured knowledge

Storage Knowledge Corpus

Storage definitions, connected to their evidence.

866 terms · Page 4 of 29

A-Z

  1. Term

    Closed-loop load

    A closed-loop load model uses a fixed client population whose next request follows completion of a previous request, optionally after think time.

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  2. Term

    Codeword (storage ECC)

    A storage ECC codeword is an encoded unit representing a data chunk together with error-correction redundancy.

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  3. Term

    Cold archive tier

    A cold archive tier is the storage tier for data that is rarely read, for example once a year or less, and kept for long retention, so its hardware is provisioned for low power and capacity rather than low-latency access, accepting first-byte delays of seconds or more.

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  4. Term

    Command duration limit

    A command duration limit is a device-side policy selected by a descriptor index for supported storage commands.

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  5. Term

    Compare-and-swap

    Compare-and-swap is an atomic conditional update that replaces a stored value only if it matches an expected value and reports the comparison outcome or observed value.

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  6. Term

    Compensation log record

    An ARIES compensation log record describes a rollback action for redo and records where undo processing should continue.

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  7. Term

    Competing risks

    Competing risks are mutually exclusive first-event types for which occurrence of one prevents the others from being the first event in the defined process.

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  8. Term

    Completion latency (fio)

    Completion latency in fio is the engine-dependent interval from submission of an I/O unit to observation of its completion.

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  9. Term

    Composite checksum

    A composite checksum is an object-level integrity value formed by combining the ordered checksums of the object's upload parts under a specified construction.

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  10. Term

    Compression dictionary

    A compression dictionary supplies reusable prior content or coding state that an encoder and decoder use to represent data more compactly.

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  11. Term

    Computational storage drive

    Computational storage is an architecture that couples computation to storage to offload host processing or reduce data movement; a computational storage drive (CSD) is a storage element that contains one or more computational storage engines (such as a CPU or FPGA) together with persistent data storage, and can still work as a standard drive.

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  12. Term

    Concurrent positioning range (ATA)

    An ATA concurrent positioning range is a contiguous logical-block range reported as supporting positioning concurrently with other reported ranges.

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  13. Term

    Conditional write

    A conditional write changes a resource only when a server-evaluated precondition, such as a matching entity tag or the absence of a current object, holds.

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  14. Term

    Confidence interval

    A confidence interval is a set of parameter values produced by a procedure with a stated repeated-sampling coverage under specified model and sampling assumptions.

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  15. Term

    Consumer SSD

    An SSD intended for personal computers and other client devices rather than shared server workloads.

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  16. Term

    Container capping

    Container capping limits the old containers referenced by a backup segment by storing selected duplicate chunks again.

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  17. Term

    Content-defined chunking

    Content-defined chunking divides a byte stream using content-dependent boundary rules rather than only fixed offsets.

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  18. Term

    Controller Memory Buffer (CMB)

    Controller Memory Buffer is an optional NVMe mechanism that exposes controller-resident memory for host use through PCIe.

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  19. Term

    Conventional magnetic recording (CMR)

    Conventional magnetic recording (CMR) uses non-shingled tracks that permit in-place sector updates without SMR-style band rewriting.

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  20. Term

    Convergent encryption

    Convergent encryption derives an encryption key from content so that matching plaintext can produce matching data ciphertext for deduplication.

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  21. Term

    Coordinated omission

    Coordinated omission is a measurement bias in which a workload generator or sampler misses observations because its activity depends on the slow responses being measured.

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  22. Term

    copy_file_range

    copy_file_range is a Linux system call that copies a requested file range in the kernel and reports the number of bytes actually copied.

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  23. Term

    Copy-on-abundant-write

    Copy-on-abundant-write is a research cloning policy that buffers changes to postpone unsharing until enough work accumulates to justify copying.

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  24. Term

    Copy-on-write (storage)

    A technique that writes modified blocks to new locations instead of overwriting in place.

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  25. Term

    Counting Bloom filter

    A counting Bloom filter tracks approximate set membership with counters that support insertions and deletions through matched increments and decrements.

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  26. Term

    Crash consistency

    Crash consistency is the property that persistent state remains within an application's allowed recovery states after an unexpected interruption.

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  27. Term

    Crash-corruption ambiguity

    Crash-corruption ambiguity occurs when the same observed stored state is consistent with both an interrupted update and corruption after persistence.

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  28. Term

    Crash-test oracle

    A crash-test oracle is a checker that decides whether a recovered state satisfies the specified correctness and durability contract.

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  29. Term

    CRUSH

    CRUSH is a deterministic, pseudorandom placement algorithm that maps an identifier to storage targets using a weighted cluster hierarchy and placement rules.

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  30. Term

    Cryptographic erase

    Cryptographic erase sanitizes the keys protecting encrypted target data so that recovering the plaintext becomes infeasible.

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