vLight path diagnostics LEDs

The memory expansion module has light path diagnostics LEDs (front and rear) to indicate hardware, scaling, and power problems.

vRedundant cooling and power capabilities

The memory expansion module supports a maximum of two 675-watt hot-swap power supplies and five single-motor hot-swap fans. The redundant fans provide continued cooling if one fan fails. The memory expansion module comes with one 675-watt hot-swap power supply and five fans. If a problem occurs with one of the power supplies, the other power supply can meet the power requirements.

vLarge memory capacity

The memory bus supports up to 1 TB of memory. The memory controller supports error correcting code (ECC) for up to 32 industry-standard 1066 MHz PC3-10600R-999 or 1333 MHz PC3-8500, DDR3 (third-generation double-data-rate), registered, synchronous dynamic random access memory (SDRAM) DIMMs.

Reliability, availability, and serviceability features of the memory expansion module

Three of the most important features in product design are reliability, availability, and serviceability (RAS). These factors help to ensure that the integrity of the data processed in your memory expansion module is preserved, that the expansion module is available when you want to use it, and should a failure occur, you can easily diagnose and repair the failure with minimal inconvenience.

The memory expansion module has a 1-year parts and 1-year labor limited warranty, or it assumes the warranty of the x3850 X5 or x3950 X5 host server to which it is attached, whichever is longer.

The following is an abbreviated list of the RAS features that the expansion module supports:

vChipkill memory protection

vHot-swap and redundant cooling with fan-speed-sensing capability (front serviceability)

vHot-swap and redundant power supplies (rear serviceability)

vInformation LED panel

vIn-rack serviceability

vMemory redundant bit steering (RBS) and error correcting code (ECC)

vMemory mirroring support (mirrored DIMMs are mutually exclusive of each other)

vQuickPath Interconnect (QPI) fail down

vRear serviceability power supplies

Chapter 1. The System x3850 X5 and x3950 X5 server 25

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IBM 71453RU manual System x3850 X5 and x3950 X5 server