NonStop S-Series Planning and Configuration Guide (G06.26+)

Terms and Concepts
HP NonStop S-Series Planning and Configuration Guide—523303-017
1-26
CRUs and FRUs
CRUs and FRUs
NonStop S-series system hardware components are divided into two categories: CRUs
and field-replaceable units (FRUs).
CRUs
CRUs are divided into three service classes: Class-1, Class-2, and Class-3 CRUs.
Class-1 CRUs
A Class-1 CRU probably will not cause a partial or total system outage if the
documented replacement procedure is not followed correctly.
Customers replacing a Class-1 CRU are not required to have previous experience with
replacing CRUs. However, for some Class-1 CRUs, customers must:
•
Be able to use the tools needed for the replacement procedure
•
Protect components from electrostatic discharge (ESD)
Class-1 CRUs are:
Battery retainers
Cables except ServerNet cables between enclosures
Enclosure doors
External rear group service LED cable assemblies
Fans (NonStop S-series, not IOAM)
Internal and external disk drives
Loopback test connectors
Metric rack mount kits
Power cords (AC)
Power shelf front panels
Power supplies
ServerNet adapter filler panels