Cisco ACI – Node Stateful Vs Stateless reload

Definition

Reload where process state is preserved using
checkpoints

Reload where process starts fresh without any prior
state

State Preservation

Yes – runtime state is saved to Persistent Storage
Services (PSS)

No – process is restarted without retaining previous
state

Recovery Speed

Faster – resumes from last known state

Slower – requires full reinitialization

System Impact

Minimal – seamless continuation of operations

Higher – may cause temporary disruption or delay

Use Case

Preferred for critical services needing quick
recovery

Used when state cannot be preserved or process needs
a clean start

Managed By

Persistent Storage Services (PSS)

System Manager

Example Scenario

Restarting a service with session data intact

Replacing a crashed process with a new instance