SI-13(3)

Requirement

Manually initiate transfers between active and standby system components when the use of the active component reaches [Assignment: organization-defined percentage] of the mean time to failure.

Discussion

For example, if the MTTF for a system component is 100 days and the MTTF percentage defined by the organization is 90 percent, the manual transfer would occur after 90 days.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and information integrity policy; system and information integrity procedures; procedures addressing predictable failure prevention; system design documentation; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel responsible for MTTF activities; organizational personnel with information security responsibilities; system/network administrators; organizational personnel with contingency planning responsibilities].

Test

[SELECT FROM: Organizational processes for managing MTTF and conducting the manual transfer between active and standby components].

ID	Assessment Objectives
SI-13(03)	transfers are initiated manually between active and standby system components when the use of the active component reaches <SI-13(03)_ODP percentage> of the mean time to failure.

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