v Redundant connectionThe addition of the optional Ethernet daughter card provides failover capability toa redundant Ethernet connection with the applicable application installed. If aproblem occurs with the primary Ethernet connection and the optional Ethernetdaughter card is installed on the server, all Ethernet traffic that is associated withthe primary connection is automatically switched to the optional redundantEthernet daughter card connection. If the applicable device drivers are installed,this switching occurs without data loss and without user intervention.v Redundant cooling and optional power capabilitiesThe server supports a maximum of two 675-watt hot-swap power supplies andsix dual-motor hot-swap fans, which provide redundancy and hot-swap capabilityfor a typical configuration. The redundant cooling by the fans in the serverenables continued operation if one of the fans fails. The server comes with one675-watt hot-swap power supply and six fans. You can order the second optionalpower supply.v ServeRAID supportThe ServeRAID adapter provides hardware redundant array of independent disks(RAID) support to create configurations. The standard RAID adapter providesRAID levels 0, 1, and 1E. An optional RAID adapter is available for purchase thatprovides RAID levels 0, 1, 5, 6, 10, 50, and 60.v Systems-management capabilitiesThe server comes with an integrated management module (IMM). When the IMMis used with the systems-management software that comes with the server, youcan manage the functions of the server locally and remotely. The IMM alsoprovides system monitoring, event recording, and network alert capability. Thesystem-management connector on the rear of the server is dedicated to the IMM.The dedicated system-management connector provides additional security byphysically separating the management network traffic from the productionnetwork. You can use the Setup utility to configure the server to use a dedicatedsystems-management network or a shared network.v TCP/IP offload engine (TOE) supportThe Ethernet controllers in the server support TOE, which is a technology thatoffloads the TCP/IP flow from the microprocessor and I/O subsystem to increasethe speed of the TCP/IP flow. When an operating system that supports TOE isrunning on the server and TOE is enabled, the server supports TOE operation.See the operating-system documentation for information about enabling TOE.Note: As of the date of this document, the Linux operating system does notsupport TOE.Reliability, availability, and serviceabilityThree important computer design features are reliability, availability, andserviceability (RAS). The RAS features help to ensure the integrity of the data thatis stored in the server, the availability of the server when you need it, and the easewith which you can diagnose and correct problems.Your server has the following RAS features:v 3-year parts and 3-year labor limited warranty for machine type 7946; 4-yearparts and 4-year labor limited warranty for machine type 4198.v Automatic error retry and recoveryv Automatic restart on nonmaskable interrupt (NMI)v Automatic restart after a power failureChapter 1. The System x3550 M2 server 11