AIX system administrator-Chapter 1 Notes

IBM product series

Series x is a PC server -- e-server x
X indicates x-architecture
You can freely choose the running environment, such as windows, linux, and unix.
P series as minicomputers -- e-server p
P indicates performance [performance]
Run powerful unix systems such as p550 and p570
I series is a middleware -- e-server I
I indicates intergrated
Already integrated with the P series
Z series for mainframe -- e-server z
Z indicates zero, meaning zero fault time, it also indicates very stable

English words:

PC server: persoal conputer server
Minicomputer: small computer
Mainframe: mainframe

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Generally, the server thickness is displayed in the U table, and 1U indicates 4.44.

In 2005, IBM renamed the e-server series server to the system series.
The original e-server z series was changed to system Z [mainframe ].
The original e-server x series was changed to system x [PC server]
Combine e-server I Series and e-server P series into power system [combine middleware and minicomputer into Minicomputer Series]

Definition of POWER-Performance Optimized With Enhanced RISC [an Enhanced Performance-Optimized CPU chip of a CPU]

Definition of the English version -- Reduced CED Instruction Set Computer [Simplified Instruction Set Computer]

Machine numbers corresponding to the POWER series

Power5-power6-power7 corresponds to below
P6xx -- p5xx-p7xx

That is, p550 and p570 are both power6 CPUs.

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Serial port interface is 9-pin, 9-hole, 2 rows

The display interface is 15-pin, 15-hole, and 3-row. Generally, the interface connecting to the projector is used on the personal computer.

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AIX -- Advanced Interactive Executive [Advanced Interactive execution program]

AIX can only be installed on IBM minicomputers.

AIX file systems-JFS, JFS2, and LVM (logical volume management)

SMP -- Symmetric rical Multi-Processing [Symmetric Multi-Processing Architecture Technology]
A group of processors (multiple CPUs) are collected on a computer, and memory subsystems and bus structures are shared among CPUs.

POWER series servers + AIX operating system

RAS:
Reliability-Reliability
No downtime per year
Availability -- Availability
Only 15 minutes of downtime per year (99.997% reliability]
Serviceability -- service
Fast patching time
    
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Main technologies and features of the pSeries and AIX systems

LVM (Logical Volume Manager)-Logical Volume management-the AIX system can only use LVM management
Dynamic File system scalability
Provides RAID technology at the operating system level

JFS (Journaled File System) -- log File System -- AIX5.3 and later support JFS2 File System
Shoe-matching operations on the file system will be recorded in a dedicated associated database [similar to the redo log of the Oracle database]
After an exception is restarted, the consistency of the file system can be quickly and automatically restored through the log [similar to the instance recovery executed when the Oracle database is shut down abort and then started]
The JFS file system is outdated and currently uses the JFS2 file system.

SMIT (System Management Interface Tool)-Interactive System Management Tool
System configurations of the AIX system are uniformly placed in the system's ODM database [equivalent to the registry in windows]
Smit provides a menu-based management interface to provide users with good system management measures

LPAR (logic partition) -- Logical partition
The hardware resources of a single server are divided into multiple virtual servers (multiple logical partitions), and each logical partition can be independently installed with OS to support different applications.
Each partition is independent of each other. You can start or stop any partition without affecting other partitions.
LPAR is divided into static (after 5.1) and dynamic (after 5.2)
DLPAR (dynamic logical partition)-supports resource reallocation without restarting
Micro-PAR -- Differential zone (supported after 5.3) -- a single physical processor can be split into multiple logical processors and allocated to logical partitions.
HMC (hardware management console) is required to use LPAR.

SMT (Simultaneous MultiThreading) -- synchronous MultiThreading
Speed from fast to slow: CPU registers --> Level 1 cache --> level 2 cahce --> level 3 cache --> memory --> hard disk
Clock frequency: one cycle, several cycles, dozens, dozens, tens, thousands, or tens of thousands of cycles
-- One cycle is within one hundred million points per second
3.5Hz indicates 3500M per work cycle, which is about one second from 3.5 billion
        
Coarse-grained multithreading
But when the thread does not find the second-level cache, it does not look back and directly switches to the next process. At the same time, it continues to cache the command to cahce.
Continues execution after the current process ends, improving CPU utilization.
Fine-grained multithreading
Fixed time period for two threads to switch CPU usage
Synchronous multithreading
Enables two threads to use the CPU at the same time in a clock cycle to make full use of the CPU
    
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AIX system administrator-Chapter 1 Notes