Lenovo HX5 Configure-to-Order Betriebsanweisung PDF herunterladen (Seite 9)

Optimized for virtualization and database applications with maximum

memory and compute capacity in a blade

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

For peak performance:

• Populate processors with equal amounts of memory to enable a balanced NUMA system

• Populate both memory controllers within a processor with equal memory capacity

• Populate an even number of ranks per channel

Power guidelines:

• Fewer larger DIMMs (for example 8 x 4GB DIMMs vs. 16 x 2GB DIMMs will generally have lower

power requirements

• x8 DIMMs (x8 data width of rank) will generally draw less power than equivalently sized x4 DIMMs

Reliability guidelines:

• Using fewer, larger DIMMs (for example 8 x 4 GB DIMMs vs. 16 x 2GB DIMMs is generally more

reliable

• Memory controllers support IBM Chipkill memory protection technology with x4 DIMMs (x4 data width

of rank) and x8 DIMMs

For increased availability beyond Chipkill error correction, the eX5 servers offer additional levels

of IBM Active Memory protection:

Memory ProteXion

technology provides multichip error protection and works in conjunction with

Chipkill technology—which provides multibit protection per chip—and standard ECC protection,

to provide multi-level memory correction.

With memory rank sparing, two unused ranks per memory card are configured as spares.

These spare ranks are used in the event of a memory failure on the same memory card.

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. With mirroring enabled, one-

half of total memory is available for use. (Note: Due to the double writes to memory, performance

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

Memory scrubbing is an automatic daily test of all system memory. It detects and reports

memory errors that might be developing before they cause a server outage. Memory scrubbing

and Memory ProteXion work together. When a bit error is detected, memory scrubbing

determines whether the error is recoverable. If the error is recoverable Memory ProteXion

technology will write the data to new location; if it is not recoverable, scrubbing sends an alert to

light path diagnostics, which then notifies IBM Systems Director.

Memory is available in 2GB, 4GB, 8GB, or 16GB DIMMs.

High-Performance Scalability

Because of eX5 design, an HX5 server has the incredible flexibility of scaling from 2 sockets to 4

sockets with ease, doubling the memory and storage capacity and I/O slots in the process. A 2-

node configuration is achieved simply by connecting 2 30mm blades together via the Quick Path

Interconnect (QPI) ports, for 4 sockets and 32 DIMMs (up to 512GB—model-specific).

Alternatively, you can scale via MAX5, adding memory capacity to increase performance in an

I/O-intensive environment. This configuration connects 1 HX5 blade to 1 MAX5 blade, for a total

of up to 40 DIMMs (640GB). Note: Selected models of HX5 come standard with a MAX5 blade.

This scalability and memory expansion feature is a unique IBM enhancement, not offered by

other x86 server architectures.

Integrated Virtualization

HX5 offers a separately orderable IBM 2GB USB Flash Drive option preloaded with VMware

vSphere Hypervisor (previously ESXi), an embedded version of VMware ESX Server. Microsoft

Hyper-V and Xen are also supported, installed by the user on an SSD.

ESXi is fully contained on the flash drive, without requiring any disk space. 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. ESXi includes all the performance, scalability and compatibility features of

ESX Server, including full VMFS support across FC SAN, iSCSI SAN, and NAS, and 4-way

VSMP. Rather than management through a Service Console based on a Linux operating system,

ESXi relies on aggregate management tools, including VirtualCenter, the Remote Command

Line interface and the introduction of CIM for standards-based and agentless hardware

monitoring. Licensing works the same as for “standard” ESX Server.

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