IBM Eserver i5 User manual

iSeries. mySeries.

Common Europe Luxembourg

Introducing IBM eServer i5 & i5/OS

LPAR i5 “Up-to-Date” :

Logical Partitions on the IBM Power5

by Eddy PASTEGER

iSeries. mySeries.

Logical Partitions on the IBM Power5

Introduction

iSeries. mySeries.

Introduction

Objectives

Understand the LPAR functionality as implemented on the IBM Power5 servers

Understand planning considerations and system requirements

Warning

This presentation is built on functionalities available on i5 models 5xx running i5/OS V5R3

iSeries. mySeries.

Logical Partitioning on the IBM Power5

Agenda

Chapter 1. Architecture

Chapter 2. Resources Management Concepts

Chapter 3. LPAR-Capable i5 Models

Chapter 4. Planning

Chapter 5. Hardware Management Console

Chapter 6. Virtual Partition Manager

iSeries. mySeries.

Logical Partitions on the IBM Power5

Architecture

iSeries. mySeries.

Architecture

HMC

Service

Processor

Complex

Main

Storage

I/O

Subsystem

NVRAM

Permanent Temporary

The Service Processor

Standard built-in, independent component of every eServer i5 or p5

Own processor, memory and boot code

NVRAM stores the “firmware” and the LPAR configuration

iSeries. mySeries.

Architecture

The Service Processor (aka SP)

Once main power is connected ...

The SP activates its own “firmware” operating system

Control panel shows C1xx progress codes

Gathers vital product data (VPD) from the electronic components in the server

Runs diagnostic routines to verify its hardware and firmware

Control panel shows 01 and the green power LED is flashing

The server is in “SP Standby” mode

The server is ready to interface with HMC

HMC

Service

Processor

Complex

Main

Storage

I/O

Subsystem

NVRAM

Permanent Temporary

iSeries. mySeries.

Architecture

HMC

Service

Processor

Complex

Main

Storage

I/O

Subsystem

Power Hypervisor

P1 P2 P3 P4

The Service Processor (aka SP)

Once you power on the system ...

The SP turns on the system power

All I/O towers via SPCN

Control panel shows C7xx progress codes

Runs diagnostic routines to verify system processors and system main storage

Verifies that it can communicate with environmental sensors and monitors in the system

Control panel shows 01 and the green power LED is on

The server is in “Hypervisor Standby” mode

iSeries. mySeries.

Architecture

The Power Hypervisor

Previously part of the System Licensed Internal Code (SLIC)

Known as “Partition Licensed Internal Code (PLIC)”

PLIC is enhanced to be used with the eServer i5 hardware

Power Hypervisor is independent from any operating system

There is no longer the concept of a “Primary Partition”

There is no longer the need to IPL the whole system to make partitions changes

There is no longer a single point of failure with a “Primary Partition”

Also known as ...

Firmware

Server Firmware

Hypervisor

Power Hypervisor

pHyp

Underware

iSeries. mySeries.

Architecture

The Power Hypervisor Functions

Virtual processor support

Allocation of physical processor time to partition thru “virtual processors”

Virtual memory management

Allocation of physical memory to partition thru “virtual memory”

Virtual hardware support

Processors

OptiConnect

SCSI

Ethernet

Serial

Security an isolation between partition

Partition allowed to access only to their allocated resources

Enforced by the Power Hypervisor

Reinitializes processors, resets registers, flushes caches

Clears memory

Reset I/O devices

iSeries. mySeries.

Architecture

TIMI

HMC

Hardware

Power Hypervisor

P1 P2 P3 P4

SLIC

i5/OS

Starting an i5/OS partition

Hypervisor will operates a “virtual service processor” to load and start SLIC

SLIC is changed to interface with the new Power Hypervisor

TIMI and all the layers above are still in place

iSeries. mySeries.

Architecture

TIMI

HMC

Hardware

Power Hypervisor

P1 P2 P3 P4

SLIC

i5/OS

Open

Firmware

RTAS

Linux

Open

Firmware

RTAS

AIX

Starting a LINUX or AIX partition

Hypervisor will operates ...

Open Firmware contains boot-time drivers and the boot manager

RTAS is a service that passes platform-dependent system calls to the Hypervisor

Other is characteristic to the guest operating system

E.g. Linux has a “monolithic” kernel, while AIX has a “microkernel-hybrid” structure

iSeries. mySeries.

Architecture

HMC

Service

Processor

NVRAM

Permanent Temporary

Power Hypervisor

Service Partition

TIMI

SLIC

i5/OS

A B

Firmware

MHxxxxx

Hypervisor Code Maintenance

iSeries. mySeries.

Logical Partitions on the IBM Power5

Resources Management Concepts

iSeries. mySeries.

Resources Management Concepts

What is “logical partitioning” ?

The ability to make a single server run as if it were many independent systems

Each logical system is called a “Partition”

Each partition operates as an independent system

Each partition will receive a portion of the system resources :

Processor

Memory

I/O slots

Virtual I/O slots

iSeries. mySeries.

Logical Partitions on the IBM Power5

Resources Management Concepts

Processor

iSeries. mySeries.

Resources Management Concepts

Processor Concepts

Dedicated vs. Shared Processors

Virtual Processors

Capped vs. Uncapped Processors

Considerations about LPAR and SMT

iSeries. mySeries.

Processor Concepts

Physical Processors

SharedDedicated

P1 P2 P3

Inactive

Processor Concepts

iSeries. mySeries.

Processor Concepts

Dedicated Processors

A “dedicated processor” refers to a whole processor that is dedicated to a single partition

One or more processors can be dedicated to a partition

The most simple way to distribute processors among logical partitions

Rules & requirements :

At least one dedicated processor

Granularity of movements : one processor

Processor moves are dynamic, without any IPL within the configured ranges

Unallocated processors are not used

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