Lenovo x3550 M3 Guide de l'utilisateur télécharger pdf (Page 7)

Leadership enterprise server with significantly lower cost of ownership in a highly available and

expandable, rack-dense, 1U dual-socket server

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• The 2R designator is the rank count for this particular DIMM (2R = dual-rank)

• The x4 designator is the data width (in bits) of the rank

It is important to ensure that DIMMs with the appropriate number of ranks are populated in each

channel for optimal performance. Whenever possible, use dual-rank DIMMs in the system. Dual-

rank DIMMs offer better interleaving and hence better performance than single-rank DIMMs. For

instance, a system populated with six 2GB dual-rank DIMMs outperforms a system populated with

six 2GB single-rank DIMMs by 7% for SPECjbb2005. Dual-rank DIMMs are also better than quad-

rank DIMMs because quad-rank DIMMs will cause the memory speed to be down-clocked.

Another important guideline is to populate equivalent ranks per channel. For instance, mixing one

single-rank DIMM and one dual-rank DIMM in a channel should be avoided.

Notes: It is important to populate all three memory channels in each processor. The relative

memory bandwidth decreases as the number of channels populated decreases. This is because

the bandwidth of all the memory channels is utilized to support the capability of the processor. So,

as the channels are decreased, the burden to support the requisite bandwidth is increased on the

remaining channels, causing them to become a bottleneck. RDIMMs and UDIMMs cannot be

used in the same server. If 1.5V and 1.35V DIMMs are mixed, all DIMMs will run at 1.5V.

In addition to Chipkill error correction, the x3550 M3 offers an additional level of IBM Active

Memory protection: memory mirroring.

Memory mirroring works much like disk mirroring. The total memory is divided into three channels:

a primary channel, a backup channel, and an unused channel. Data is written concurrently to both

the primary and backup channels. If a DIMM fails in one of the DIMMs in the primary channel, it is

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

the failing DIMM is replaced. One-third of total memory is available for use at any one time with

mirroring enabled. (Note: Due to the double writes to memory, performance is affected.) Because

the third channel is disabled with mirroring active, there is no point in populating it with memory.

Mirroring is handled at the hardware level; no operating system support is required.

DDR3 memory is currently available in 2GB, 4GB, 8GB and 16GB RDIMMs, as well as 2GB and

4GB UDIMMs. DIMMs are installed individually (not in pairs). However, for performance reasons,

in a 2-processor system, it’s best to install a DIMM per processor.

Maximum memory capacity and speed in 2-processor configurations include:

Memory

Frequency

DIMMs per

Channel

Max. Memory

Capacity

5600 Series

1333MHz

(6 DIMMs)

48GB RDIMM

24GB UDIMM

1333MHz E56xx, L5640, and

X56xx

1333MHz

(12 DIMMs)

96GB RDIMM

48GB UDIMM

1333MHz E56xx, L5640, and

X56xx

1066MHz

(12 DIMMs)

96GB RDIMM

48GB UDIMM

E560x, E5620, L5609, L5630,

and X5647

800MHz

(18 DIMMs)

144GB RDIMM All

800MHz

(12 DIMMs)

192GB RDIMM All

800MHz-

1333MHz

(8 DIMMs)

64GB RDIMM

16GB UDIMM

All

Integrated Virtualization

All models of the x3550 M3 support a USB 2.0 Flash Key installed preloaded with VMware

vSphere Hypervisor (formerly ESXi). Rather than management through a Service Console based

on a Linux operating system, vSphere Hypervisor relies on aggregate management tools,

including VirtualCenter, the Remote Command Line interface and the introduction of CIM for

standards-based and agentless hardware monitoring.

vSphere Hypervisor includes all the performance, scalability and compatibility features of a

hypervisor installed on disk, including full VMFS support across FC SAN, iSCSI SAN, and NAS,

and 4-way VSMP. Because it runs from flash memory, it’s extremely fast and ideal for diskless

configurations. It also offers enhanced security, because it runs without an operating system-

based console and is updated/patched much like firmware.

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Lenovo x3550 M3 Guide de l'utilisateur Page 7

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