Storage Consumption [Dido Solutions, Inc Wiki]

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====== Storage Consumption ======

[[dido:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]

===== Discussion =====

Storage Consumption is [[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]] concerning the amount of storage used by a subject while performing specified activities under specified conditions.

Storage Consumption can apply to:

  * A [[dido:99_annexes:annex-b-terms-and-definitions:c:candidate_solution|Candidate Solution]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:d:distributed_system|Distributed System]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]]
  * A Qualified Node
  * A [[dido:99_annexes:annex-b-terms-and-definitions:n:node_set|Node Set]]
  * A service
  * A software component
  * A data store
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_environment|Test Environment]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_run|Test Run]]
  * Another subject using storage

Storage Consumption can include storage used for:

  * Executable Artifacts
  * Configurations
  * Dependencies
  * Operational data
  * Transaction data
  * Temporary data
  * Cached data
  * Replicated data
  * Backup data
  * Log records
  * Audit records
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_definition|Test Definitions]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:t:test_result|Test Results]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
  * Provenance records
  * Traceability records
  * Another stored information set

Storage Consumption can identify:

  * The evaluated subject
  * The specified activity
  * The storage type
  * The storage location
  * The applicable workload
  * The applicable [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|Configuration]]
  * The measurement starting event
  * The measurement completion event
  * The measurement interval
  * The amount of storage allocated
  * The amount of storage used
  * The amount of storage retained
  * The amount of temporary storage used
  * The amount of replicated storage used
  * The applicable measurement unit
  * The required measurement precision
  * The permitted exclusions
  * The permitted tolerance
  * The applicable normalization method
  * The applicable retention requirements
  * The applicable DIDO [[dido:99_annexes:annex-b-terms-and-definitions:b:baseline|Baseline]]
  * The applicable [[dido:99_annexes:annex-b-terms-and-definitions:v:validation_criteria|Validation Criteria]]
  * The applicable [[dido:99_annexes:annex-b-terms-and-definitions:a:acceptance_criteria|Acceptance Criteria]]
  * Its Evidence
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]]

Storage Consumption can be expressed as:

  * Total storage used
  * Average storage used
  * Maximum storage used
  * Storage used per transaction
  * Storage used per Test Run
  * Storage used per Node
  * Storage used per unit of time
  * Storage growth over time
  * Storage retained after completion
  * Storage released after completion
  * Another value established by the Acceptance Criteria

===== Definition =====

//[[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]] concerning the amount of storage used by a subject while performing specified activities under specified conditions//

===== Source =====

Adapted from:

  * [[https://www.iso.org/standard/78176.html|ISO/IEC 25010:2023, Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model]]
  * [[https://www.iso.org/standard/35747.html|ISO/IEC 25023:2016, Systems and software Quality Requirements and Evaluation (SQuaRE) — Measurement of system and software product quality]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:performance_efficiency|Performance Efficiency]]
  * DIDO Reference Implementation Conceptual Model
  * DIDO-TE draft Requirements Register

ISO/IEC 25010 includes resource utilization within its product-quality model, and ISO/IEC 25023 provides related quality measures.

This definition specializes Resource Consumption for storage used during DIDO and DIDO-TE operations.

===== Note =====

Storage Consumption differs from storage capacity:

  * Storage capacity identifies the amount of storage available
  * Storage Consumption identifies the amount of storage used

Storage Consumption differs from storage allocation:

  * Storage allocation identifies the amount of storage reserved or made available
  * Storage Consumption identifies the amount of storage actually used

A subject can consume less storage than allocated.

Storage Consumption differs from Storage Efficiency:

  * Storage Consumption identifies an amount of storage used
  * Storage Efficiency relates completed work, retained information, or another useful outcome to the storage used

Lower Storage Consumption does not necessarily indicate a better Candidate Solution. Lower consumption can result from:

  * Retaining less required information
  * Omitting Evidence
  * Using greater processing time
  * Using greater network capacity
  * Reducing redundancy
  * Applying more effective compression
  * Another design or operational difference

The applicable Acceptance Criteria determine which stored information must be included and which exclusions are permitted.

Storage Consumption measurements should identify whether they include:

  * Primary storage
  * Replicated storage
  * Temporary storage
  * Cached storage
  * Backup storage
  * Log and audit storage
  * Evidence storage
  * Storage-system overhead

===== Example =====

DIDO-TE evaluates three Candidate Solutions using the same Test Definition, Test Environment, workload, retention period, and Evidence requirements.

For each Candidate Solution, DIDO-TE records:

  * Maximum storage used
  * Average storage used
  * Storage used per transaction
  * Storage used for logs
  * Storage used for Evidence
  * Storage retained after Test Run completion

The comparative evaluation uses these measurements to compare Candidate Solution Storage Consumption.

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