NonStop S-Series Planning and Configuration Guide (G06.28+)

Terms and Concepts
HP NonStop S-Series Planning and Configuration Guide—523303-020
1-32
CRUs
Class-3 CRUs
A Class-3 CRU can cause a partial or total system outage if the documented
replacement procedure is not followed correctly.
Customers replacing Class-3 CRUs should have either six or more months of
experience with replacing CRUs or equivalent training. Also, they must:
•
Be able to use the tools needed for the replacement procedure
•
Protect components from electrostatic discharge (ESD)
•
Understand the dependencies involved in some CRU replacement procedures,
such as disk-path switching
Replacement by a HP trained service provider is recommended for Class-3 CRUs.
Class-3 CRUs are:
Memory Units
Memory units are Class-3 CRUs for type 1950 (S7000) and 1951 (S70000) PMF
CRUs. Memory units in all other types of PMF CRUs must be replaced by a
manufacturing facility authorized by HP.
6760 ServerNet device adapters (ServerNet/DAs)
6763 Common Communication ServerNet adapters (CCSAs)
Fiber-optic UltraSCSI extenders
Front group service LED cable assemblies
I/O multifunction (IOMF) CRUs
I/O multifunction (IOMF) 2 CRUs
Memory units (under certain circumstances; see Memory Units on page 1-32)
Modular ServerNet expansion boards (MSEBs)
Plug-in cards (PICs)
Processor multifunction (PMF) CRUs
Processor multifunction (PMF) 2 CRUs
SCSI terminators
ServerNet expansion boards (SEBs)