IBM eserver i5 User manual

iSeries. mySeries.
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
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iSeries. mySeries.
iSeries. mySeries.
Logical Partitions on the IBM Power5
Introduction
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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
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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
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Logical Partitions on the IBM Power5
Architecture
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Architecture
HMC
Service
Processor
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
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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
Processor
Complex
Main
Storage
I/O
Subsystem
NVRAM
Permanent Temporary
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Architecture
HMC
Service
Processor
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
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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
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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
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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
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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
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Architecture
HMC
Service
Processor
NVRAM
Permanent Temporary
Power Hypervisor
Service Partition
TIMI
SLIC
i5/OS
A B
Firmware
Firmware
MHxxxxx
Hypervisor Code Maintenance
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Logical Partitions on the IBM Power5
Resources Management Concepts
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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
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Logical Partitions on the IBM Power5
Resources Management Concepts
Processor
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Resources Management Concepts
Processor Concepts
Dedicated vs. Shared Processors
Virtual Processors
Capped vs. Uncapped Processors
Considerations about LPAR and SMT
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Processor Concepts
Physical Processors
SharedDedicated
P1 P2 P3
Inactive
Processor Concepts
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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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