Hp GS80 User Manual download pdf (Page 7)

Memory Application Examples

Memory Application ExamplesMemory Application Examples

Memory Application Examples

Configuring memory is a compromise between cost, total memory capacity, and memory bandwidth requirements. The behavior of the application must be

used to define the most-desired configuration. Some applications are sensitive to memory capacity, some are sensitive to memory bandwidth, and some are

sensitive to neither. If actual application measurements are not available, the following may be used as guidelines:

Large memory (VLM) applications, in which large amounts of memory can substantially reduce I/O, may be optimized for total memory capacity and

future capacity growth. In VLM applications, the right balance might be one memory base module, with upgrade, for every two CPUs. This would

result in one memory array per CPU.

Typical commercial applications, such as transaction processing (OLTP) and multi-user timesharing, usually operate efficiently from cache and may not

be materially affected by memory bandwidth. Memory configuration is a balance between memory bandwidth and future capacity growth. It is

advisable to match the number of arrays to the number of CPUs.

Data mining can benefit from additional memory bandwidth. It is best to match the number of memory base modules to the number of CPUs.

The most demanding high-performance technical applications (HPTC) achieve a performance level that is directly proportional to memory bandwidth.

In these cases, configure one memory base module, with upgrade, per CPU. This results in two memory arrays per CPU.

The following table represents how 8 GB could be configured in a 4-CPU QBB system drawer in each of the four referenced applications. The numbers under

each application represent how many of each memory option should be ordered.

Memory Configuration Examples

Memory Configuration ExamplesMemory Configuration Examples

Memory Configuration Examples

– Configuring a system drawer with a total of 8 GB for specific applications

Application

ApplicationApplication

Application

VLM

OLTP, Timesharing

Data Mining

HPTC

1-GB base module

(3X-MS8AA-BB)

- - -

1-GB upgrade

(3X-MS8AA-BU)

- - -

2-GB base module

(3X-MS8AA-CB)

2 2 4

2-GB upgrade

(3X-MS8AA-CU)

2 2

- -

The following additional configuration options utilizing the 4-GB base module are available:

4-GB base module

(3X-MS8AA-DB)

2 2

N/R N/R

4-GB upgrade

(3X-MS8AA-DU)

- -

NOTE:

NOTE: NOTE:

NOTE:

N/R = Not recommended - For these applications, configure either four or eight like-sized memory options rather than one or two.

Step 5 - Evaluate Configuration Requirements to Support Optional Partitioning

Step 5 - Evaluate Configuration Requirements to Support Optional PartitioningStep 5 - Evaluate Configuration Requirements to Support Optional Partitioning

Step 5 - Evaluate Configuration Requirements to Support Optional Partitioning

Configuration Requirements for Partitions

Configuration Requirements for PartitionsConfiguration Requirements for Partitions

Configuration Requirements for Partitions

Configuring partitions requires some attention to detail with respect to minimum requirements for option selection, population, and option placement.

A single AlphaServer GS80 Model 8 can be divided into two logical hardware partitions, each running an instance of Tru64 UNIX or an instance of

OpenVMS. Each partition is allocated its own dedicated ² shared-nothing² set of hardware resources: System Drawer (s), CPU module(s), memory

module(s), and I/O.

Multiple-drawer (QBB) hard partitions within a GS80 server do not provide complete hardware failure isolation across hard partitions. Single hard

partitioned drawers (QBBs) within the server do provide hardware failure isolation.

Each hardware partition is viewed as a unique node, from a system point-of-view, with its own instance of Tru64 UNIX or OpenVMS operating system

and application software, independent system console, and error log.

In the AlphaServer GS80, each of the two hardware partitions is defined by a single system drawer.

One system management console (3X-DS8BA-xx or 3X-DS8DA-xx) and one console hub (3X-DS8AA-AA) recommended per system.

Supported option rules apply for maximum configurations of each AlphaServer GS80 system partition. Care must be exercised to ensure that any

planned reconfiguration of hardware partitions will not violate option support rules.

Minimum Hardware Required per AlphaServer GS80 Hardware Partition

Minimum Hardware Required per AlphaServer GS80 Hardware PartitionMinimum Hardware Required per AlphaServer GS80 Hardware Partition

Minimum Hardware Required per AlphaServer GS80 Hardware Partition

Each hardware partition requires one system drawer and that drawer must be configured with the minimum hardware listed below. Each system drawer can

be configured with additional hardware once this minimum requirement is met.

QuickSpecs

HP AlphaServer GS80 (1224 MHz)

Options

DA - 11422 North America — Version 7 — August 19, 2003

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QuickSpecs 1

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