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Major Elements
The elements required for proper operation of each enclosure include:
An EMU
Two power supplies, or
1 power supply and 1 blower mounting assembly
Two blowers
A single- or a dual-bus I/O module
A disk drive or disk drive blank in each bay
Element Functions
A full description of the individual elements and their functions can be found in the
individual chapters.
Element Replacement
The methods used to replace an element depend upon the following factors:
Could element replacement affect SCSI bus operation?
When the element being replaced does not interrupt data transfer nor affect the
operation of another element, the element is "hot-pluggable."
If replacement of the element, could affect data transfers or the operation of another
element, the element replacement method is "pluggable."
Are there any personal safety issues involved?
Whenever there is an issue involving personal safety, such as an electrical hazard, then
the element replacement requires stopping all data transfers the SCSI bus and
removing power from the enclosure.
Are special tools or techniques required?
When element replacement can be completed without employing special tools or
techniques, then the element is a customer replaceable unit (CRU).
When special tools or techniques are required to replace an element, then the unit is a
field replaceable unit (FRU). Only qualified, Compaq field service personnel are
authorized to replace FRUs. There are no FRUs for these products.
Table 1–1 identifies the replacement method for each element.
Introducing the Enclosure
1–7
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