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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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
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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
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iSeries. mySeries.
iSeries. mySeries.
Logical Partitions on the IBM Power5
Architecture
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iSeries. mySeries.
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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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
Processor
Complex
Main
Storage
I/O
Subsystem
NVRAM
Permanent Temporary
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iSeries. mySeries.
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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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
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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
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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
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iSeries. mySeries.
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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iSeries. mySeries.
iSeries. mySeries.
Logical Partitions on the IBM Power5
Resources Management Concepts
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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
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iSeries. mySeries.
iSeries. mySeries.
Logical Partitions on the IBM Power5
Resources Management Concepts
Processor
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iSeries. mySeries.
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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