Lenovo RD120 - ThinkServer - 6447 User Manual page 20

v Easy LED Diagnostics
v Memory mirroring
v Online-spare memory
v PCI Express adapter capabilities
v Redundant connection
v Redundant cooling and power capabilities
v RAID support
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ThinkServer RD120 Types 6444, 6445, 6446, and 6447: User Guide
Easy LED Diagnostics provides LEDs to help you diagnose problems. For more
information, see the section about Easy LED Diagnostics in the Hardware
Maintenance Manual.
Memory mirroring improves the reliability of memory by writing information to the
main memory and redundant locations in a mirrored pair of DIMMs.
Online-spare memory disables a failed pair of DIMMs from the system
configuration and activates an online-spare DIMM pair to replace the failed pair.
The server has two slots for low-profile PCI Express x4 adapters. These slots
accept x8 adapters, but the adapters will operate as x4 adapters. The server also
has two slots for PCI Express x8 adapters (on the riser card, full-height, one
full-length and one half-length).
Note: You can replace these PCI Express x8 slots with PCI-X 133 MHz slots by
replacing the PCI Express riser-card assembly with an optional PCI-X riser-card
assembly.
The addition of an optional network interface card (NIC) provides a failover
capability to a redundant Ethernet connection. If a problem occurs with the
primary Ethernet connection, all Ethernet traffic that is associated with the
primary connection is automatically switched to the redundant NIC. If the
applicable device drivers are installed, this switching occurs without data loss and
without user intervention.
The server supports up to 10 hot-swap fans, in multiples of 5, which provide
redundant cooling. Redundant cooling enables continued operation if one of the
fans fails. The server supports up to two 835-watt ac power supplies, which
provide redundancy and hot-swap capability for a typical configuration. If the
maximum load on the server is less than 835 watts and a problem occurs with
one of the power supplies, the other power supply can meet the power
requirements.
Note: A 700-watt-48 volt dc power supply option may be available. The dc
power supplies provide redundancy but no hot-swap capability.
The server supports an internal ServeRAID-8k or 8k-l SAS Controller, which is
required for you to use the hot-swap hard disk drives and to create redundant
array of independent disks (RAID) configurations.