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Chapter 7 FRU/CRU Replacement Procedures 7-23
7.7 Array FRU replacement Procedures
This chapter provides procedures for replacing failed components in an array
command module. Before using the procedures in this chapter, perform the
appropriate troubleshooting steps described in Chapter 3, "Troubleshooting and
Recovery" and in the Recovery Guru.
The replacement procedures described in this chapter can be performed as hot swap
procedures. Hot swap refers to the ability to remove and replace a component of the
command module while it is processing I/O activity.
In a fully-configured command module, each component is redundant except for the
midplane circuit board. If any redundant component fails and the storage array has
been configured for data redundancy, the component can be replaced without
powering off the array module and without interrupting data processing.
7.7.1 Replacing a Controller
Use the following procedure to replace a controller in a command module or
command module.
Note – IMPORTANT To provide full functionality in dual controller configurations,
the two controllers should have the same memory capacity. Although two
controllers of different memories can be paired in a command module, the mismatch
will cause some functions to be disabled (e.g., the cache mirroring function).
Note – IMPORTANT On dual controller command modules, a controller can be
replaced without interrupting data transfer from the host. On a single controller
command module, data transfer from the host must be terminated before the
controller can be replaced.
7.7.1.1 Tools and Equipment
■ Antistatic protection
■ Phillips-head screwdriver
■ Replacement controller