IBM 7979B1U User Manual - Page 22
PowerExecutive
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v Light path diagnostics Light path diagnostics provides LEDs to help you diagnose problems. For more information, see the section about light path diagnostics in the Problem Determination and Service Guide. v Memory mirroring Memory mirroring improves the reliability of memory by writing information to the main memory and redundant locations in a mirrored pair of DIMMs. v Online-spare memory 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. v PCI Express adapter capabilities 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. v PowerExecutive PowerExecutive™ is an IBM Director extension that measures and reports server power consumption as it occurs. This enables you to monitor power consumption in correlation to specific software application programs and hardware configurations. You can obtain the measurement values through the systems-management interface, and can view them using IBM Director. For more information, including the required levels of IBM Director and PowerExecutive, see the IBM Director documentation on the IBM Director CD, or see http://www.ibm.com/systems/management/director/resources/. v Redundant connection 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. v Redundant cooling and power capabilities 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 is available. The dc power supplies provide redundancy but no hot-swap capability. v ServeRAID support 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. 6 System x3650 Type 7979: User's Guide