ServerNet Cluster Web

Are PICs replaceable in MSEBs? Yes. PICs installed in an MSEB are

Class-3 CRUs. However, they can be replaced only by personnel who have

Compaq-provided training.

Are PICs replaceable in the Nonstop™ Cluster Switch (Model

6770)? No. PICs installed in the ServerNet II Switch component of the

6770 switch cannot be replaced at the installation site. If any component

of the switch requires servicing, the entire switch must be replaced.

Are PICs replaceable in the Nonstop™ServerNet Switch (Model

6780)? Yes. PICs installed in a 6780 switch can be replaced at the

installation site. However, if a transceiver in a PIC requires servicing, the

entire PIC must be replaced.

Power Products

What is the function of a UPS? Within a Nonstop™ Cluster Switch

(model 6770), the UPS (uninterruptible power supply) powers the

ServerNet II Switch temporarily when both primary and secondary AC

power rails fail. A battery inside the UPS typically provides about two

hours of backup power.

A UPS is optional for a Nonstop™ ServerNet Switch (model 6780). A UPS,

if used, provides power to 6780 switches temporarily when both the

primary and secondary AC power fail.

What is the function of an AC transfer switch? Within a Nonstop™

Cluster Switch (Model 6770), the AC transfer switch allows the ServerNet

II Switch and UPS to receive current from either of two AC power rails.

Power is drawn from the primary rail as long as it is available. If the

primary rail fails, then the load is connected to the secondary rail.

What is the function of a power distribution unit (PDU)? When used

with Nonstop™ ServerNet Switches (Model 6780), the PDU allows multiple

6780 Switches to receive current from either of two AC power sources.

Power is drawn from the primary power source as long as it is available. If

the primary rail fails, then the load is connected to the secondary power

source.

SANMAN

What does SANMAN do? SANMAN is the NonStop™ Kernel external

system area network manager (SANMAN). SANMAN manages the external

ServerNet fabrics and is responsible for initializing, monitoring,

configuring, and controlling the cluster switches. SANMAN also configures

the node-numbering agent (NNA) FPGA. SANMAN is a fault-tolerant