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24 IBM ^ xSeries 440 Planning and Installation Guide
With the addition of an RXE-100 Remote Expansion Enclosure, you can connect
an additional six or 12 PCI-X adapters to the x440. See 3.2.3, “Remote
Expansion Enclosure” on page 78 for details.
Note: Currently, only one RXE-100 can be connected to an x440 configuration.
For configurations up to eight-way (that is, single chassis), connectivity is using
one RXE Expansion Port and cable. The dual-chassis 16-way configuration uses
two redundant RXE cables. This is described in detail in 3.2.3, “Remote
Expansion Enclosure” on page 78.
1.9 Redundancy
The x440 has the following redundancy features to maintain high availability:
Four hot-swap multi-speed fans
With four hot-swap redundant fans, the x440 has adequate cooling for each of
its major component areas. There are two fans located at the front of the
server that direct air through the SMP Expansion Modules. These fans are
accessible from the top of the server without having to open the system
panels. In the event of a fan failure, the other fan will speed up to continue to
provide adequate cooling until the fan can be hot-swapped by the IT
administrator.
The other two fans are located just behind the power supplies and provide
cooling for the I/O devices. Similar to the SMP Expansion Module fans, these
fans will speed up in the event that one should fail to compensate for the
reduction in air flow. In general, failed fans should be replaced within 24 hours
following failure.
Two hot-swap power supplies with separate power cords.
Note: For large configurations, redundancy is achieved only when connected
to a 220 V power supply. See 3.8, “Power considerations” on page 103 for
details.
Note: There are no parallel or serial ports on the x440. For serial connections,
use the USB to Serial Adapter, part number 10K3661, as described in 3.2.4,
“Serial connections” on page 83.
Important: Due to airflow requirements, fans should not be removed for
longer than two minutes. The fan compartments need to be fully populated
even if the fan is defective. Therefore, remove a defective fan only when a
new fan is available for immediate replacement.