Storage Consumption

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Storage Consumption is Resource Consumption concerning the amount of storage used by a subject while performing specified activities under specified conditions.

Storage Consumption can apply to:

• A Candidate Solution
• A Distributed System
• A Node
• A Qualified Node
• A Node Set
• A service
• A software component
• A data store
• A Test Environment
• A 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
• Test Definitions
• Test Results
• 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 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 Baseline
• The applicable Validation Criteria
• The applicable Acceptance Criteria
• Its Evidence
• Its Provenance
• Its 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

Resource Consumption concerning the amount of storage used by a subject while performing specified activities under specified conditions

Adapted from:

• ISO/IEC 25010:2023, Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model
• ISO/IEC 25023:2016, Systems and software Quality Requirements and Evaluation (SQuaRE) — Measurement of system and software product quality
• Resource Consumption
• 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.

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

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.