TX140 S2
Upgrade and Maintenance Manual 23
Before you start
2.1.1 Customer Replaceable Units (CRU)
Customer Replaceable Units are intended for customer self service and may be
installed or replaced as hot-plug components during operation.
I Components that the customer is entitled to replace may differ according
to the service form in his country.
Hot-plug components increase system availability and guarantee a high degree
of data integrity and fail-safe performance. Procedures can be carried out
without shutting down the server or going offline.
Components that are handled as Customer Replaceable Units
– Hot-plug power supply units
– Hot-plug fan modules
– Hot-plug HDD / SSD modules
Peripherals that are handled as Customer Replaceable Units
– Keyboard
– Mouse
2.1.2 Upgrade and Repair Units (URU)
Upgrade and Repair Units are non hot-plug components that can be ordered
separately to be installed as options (Upgrade Units) or are available to the
customer through customer self service (Repair Units).
I Server management error messages and diagnostic indicators on the
front panel and system board will report defective Upgrade and Repair
Units as customer replaceable CSS components.
Upgrade and repair procedures involve shutting down and opening the server.
Customer Replaceable Units (CRU)
Upgrade and Repair Units (URU)
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