Ibm System x3400 Manuel d'utilisateur télécharger pdf (Page 4)

An affordable dual-socket, dual- and quad-core SMP server

with high performance and data protection for small and

medium businesses

Please see the Legal Information section for important notices and information.

rates.

Intelligent Power Capability powers individual processor elements on and off as needed, to reduce

power draw.

Execute Disable Bit functionality can help prevent certain classes of malicious buffer overflow attacks

when combined with a supporting operating system.

DDR II ECC Fully Buffered Memory with Chipkill Protection

The x3400 supports up to 32GB of memory in 8 DIMM sockets. It uses PC2-5300 fully-buffered double

data rate II (DDR II) memory (operating at 667MHz) for faster access, and provides advanced Chipkill

memory protection, for up to 16X better error correction than standard ECC memory.

The fully buffered memory in the x3400 provides up to triple the memory bandwidth (up to 21.3GBps in

four channels of PC2-5300 fully-buffered DIMMs vs. a maximum of 6.4GBps in two channels of unbuffered

PC2-3200 memory) and up to triple the system memory capacity (12 DIMMs x 4GB) of the predecessor

x236 server (8 DIMMs x 2GB). By performing reads and writes simultaneously, it eliminates the previous

memory read-to-write blocking latency. In addition, it also offers innovative data reliability and security

features to help improve data integrity, including enhanced CRC protection, data retry on error detect and

buffer registers for improved fault isolation.

For increased availability, the x3400 offers two additional (but mutually exclusive) levels of IBM Active

Memory protection: online memory mirroring, and online hot-spare memory.

Memory mirroring works much like disk mirroring. The total memory is divided into two channels. Data is

written concurrently to both channels. If a DIMM fails in one of the DIMMs in the primary channel, it is

instantly disabled and the mirrored (backup) memory in the other channel becomes active (primary) until

the failing DIMM is replaced. Mirroring can be accomplished with multiples of four DIMMs (one pair per

memory channel).

When online hot-spare memory is enabled, using single and/or dual-rank DIMMs one rank is set aside per

channel as online spares in case one of the other ranks in that channel fails. The spare rank must have

capacity at least that of the largest active rank. (In other words, if a combination of 2GB and 4GB DIMMs

are used in a branch, one rank on each 4GB DIMM will be used for sparing.) In an x3400 with 32GB

installed, up to 24GB (using 8 dual-rank 4GB DIMMs) of memory is available when the hot-spare feature

is active.

Either of these features requires operating system support.

When multiples of four DIMMs (4 or 8) are installed, the x3400 operates in four-way interleaved mode,

for higher performance. When only two DIMMs are used, the system defaults to two-way interleaved

mode.

DIMMs must be installed in pairs. Memory is available in kits consisting of two 512MB, 1GB, 2GB or 4GB

DIMMs.

Hot-Swap/Redundant Components

System availability is maximized through the extensive use of hot-swap and redundant components,

including:

• Redundant memory protection (with online hot-spare memory or memory mirroring enabled)

• Hot-swap, redundant hard disk drives (with RAID-1/10 protection standard, and RAID-1E/5/6

protection optional)

• Hot-swap, redundant power supplies (optional, model-specific)

• Hot-swap, redundant cooling fans (optional, model-specific)

Large HDD Storage Capacity

The x3400 offers a choice of disk storage, supporting up to four 3.5-inch simple-swap Serial ATA (SATA)

drives or four hot-swap high-performance Serial-Attach SCSI (SAS) drives standard. Using the optional

Hot-Swap SAS/SATA 4-Pac HDD Option upgrade kit on selected models, up to eight 3.5-inch hot-swap

SAS or SATA drives can be installed:

SAS

• 10,000 RPMs — 146.8 or 300GB (2.4TB maximum, using 4-Pac upgrade kit)

• 15,000 RPMs — 73.4 or 146.8GB (1.17TB, using 4-Pac upgrade kit)

SATA

• 7,200 RPMs — 160, 250, or 500GB (2.0TB)—simple-swap

• 7,200 RPMs — 160, 250, or 500GB (4.0TB, using 4-Pac upgrade kit)—hot-swap

Notes: Hot-swap and simple-swap SATA drives offer exactly the same reliability as fixed SATA drives.

Only the system availability improves using the swappable drives. (Less downtime is incurred removing

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Ibm System x3400 Manuel d'utilisateur Page 4

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