“RAS” is the ability of the system to provide resilience starting from the underlying hardware all the way to the application software through three components collectively referred to as “RAS” features:

1. Reliability: the ability of the system to detect and correct faults
2. Availability: how the system guarantees uninterrupted operation with minimal degradation
3. Serviceability: the ability of the system to proactively diagnose, repair, upgrade or replace components at scale