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.

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.

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.

￿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.

24 IBM ^xSeries 440 Planning and Installation Guide

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IBM 440 manual Redundancy