SI-13 Predictable Failure Prevention. Determine mean time to failure (MTTF) for the following system components in specific environments of operation: [organization-defined] ; and Provide substitute system components and a means to exchange active and standby
Predictable Failure Prevention. Determine mean time to failure (MTTF) for the following system components in specific environments of operation: [organization-defined] ; and Provide substitute system components and a mea.
5
artefacts
0
held by a system
3
at each review
hard
to go live
Document repository
where the evidence lives
teal = a system already holds it · olive = produced at each review
system holds itEvidence a system already holds
none for this control
periodic reviewEvidence produced at each review
- Evidence substitute components are available, and the means to exchange active and standby components · Document repository
- Records of exchanges performed and the time taken · Document repository
- Evidence the exchange preserves the security state of the component being replaced · Document repository
governing documentDocuments that govern the control
- Determined mean time to failure figures for the defined components in their specific environments of operation · Policy repository / GRC workspace
- Source of the figures, whether manufacturer data or observed failure history · Document repository
First move
This control is evidenced by people and documents, not systems. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date. Do not try to automate it.
Common gaps auditors find
- Manufacturer figures used without adjusting for the actual operating environment, which is what the control asks for
- Substitutes held for common parts while long lead single sourced components have none
- Exchange mechanism untested, so the standby is unproven at the moment it is needed
Do this for your whole sheet
Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.
Build my evidence sheetSI-12 Information management and retention · SI-14 Non-persistence. Implement non-persistent [organization-defined] that are initiated in a known state and terminated [organization-defined]