Installing an HSZ80 Cache Module

This document outlines the procedures for replacing an HSZ80 Cache Module in two scenarios: dual-redundant controller configurations and single controller configurations.

Key steps and considerations common to both:

• Safety: Strict adherence to Electrostatic Discharge (ESD) precautions (wearing a wrist strap) is required.
• Battery Handling: The External Cache Battery (ECB) must be disabled (via a switch) before disconnecting or connecting its cable to prevent shorting the cache module.
• The replacement cache module must have the same memory capacity as the module it replaces.

For Dual-Redundant Controller Configurations:

• This process primarily uses the FRUTIL utility.
• Removal: Involves connecting a terminal, disabling failover, running FRUTIL to quiesce ports and select the "other cache module" for removal. Physical removal includes disengaging levers, disabling the ECB, disconnecting its cable, and placing the module in an antistatic bag. There is a two-minute countdown for removal once initiated by FRUTIL.
• Installation: Also involves FRUTIL to prepare the system and quiesce ports. Physical installation includes disabling the ECB on the new module, connecting its cable, inserting the module, and engaging levers. Finally, failover is re-enabled using SET FAILOVER COPY=THIS_CONTROLLER. This phase also has a two-minute countdown.

For Single Controller Configurations:

• This process involves system shutdown and power cycling.
• Removal: Requires dismounting logical units, shutting down the controller, and powering off the subsystem. Physical removal involves disabling the ECB, disconnecting its cable, disengaging levers, and removing the module.
• Installation: Involves inserting the new module, connecting the ECB cable (after disabling the ECB on the module), restoring power to the subsystem (which re-enables the ECB), mounting logical units, and setting the system date and time.