AIX LVM Quick Refrence

Quick reference only. Assumed the reader is familiar with the concept of AIX LVM

Action	smitty command	Command line	Remarks
Create a VG	smitty mkvg	mkvg -y '' -s '128'
Create a LV	smitty mklv	mklv -t jfs -y ''	jfs2 is preferred
Create a filesystem	smitty crfs	crfs -v jfs -a bf=true -d -m -A	jfs2 is preferred
Resize FS	smitty chfs	chfs -a size=+
Extend a VG	smitty extendvg	extendvg ...
Reduce a VG	smitty reducevg	reducevg
Move PV data	smitty migratepv	migratepv -l
Online a vg	smitty varyonvg	varyonvg
Offline a vg	smitty varyoffvg	varyoffvg
Export a VG	smitty exportvg	exportvg
Import a VG	smitty importvg	importvg -y
Remove a filesystem	smitty rmfs	Not recommend to use CLI
Make a lvcopy	smitty mklvcopy		Mirror a LV
Remove a lvcopy	smitty rmlvcopy		Remove the mirror of a LV
Split a lvcopy	No smitty	splitlvcopy -y 1
Mirror a vg	smitty mirrorvg	mirrorvg
Unmirror a vg	smitty unmirrorvg	Not recommend to use CLI

The World is Flat

Recently I am reading the book "The World is Flat". I am shocked by the changes of the 21 century.

Nowadays information technology shortens the distance between people. Anybody who know how to use the IT skill can join the platform and interact with others. This is so called the 'Flat World'. The author mentioned some companies start outsourcing some jobs or tasks to India, China, or other developing countries. This would reduce the cost as well as improve the efficiency. Because of a task of my company, I just communicated with a India support and completed the task. Apart from the language issue, there are no difference whether I was working with a local or a remote support. Perhaps you will find all the back end support will be in Indea, China, or somewhere you cannot imagine. Just as what the author said, the world is becoming flat.

Nevertheless, language is still a issue for me. It is not an easy task for me to speak in English with the Indian. Perhaps I still have to improve my English.

Ref: The book in Amazon

Delete multiple default gateways

1. Obtain how many gateways

   • # odmget -q "attribute=route" CuAt
     
     CuAt:
             name = "inet0"
             attribute = "route"
             value = "net,-hopcount,0,,0,192.168.0.2"
             type = "R"
             generic = "DU"
             rep = "s"
             nls_index = 0
     
     CuAt:
             name = "inet0"
             attribute = "route"
             value = "net,-hopcount,0,,0,192.168.0.2"
             type = "R"
             generic = "DU"
             rep = "s"
             nls_index = 0
       

2. If there are more than one, need to remove the excess route

   • # chdev -l inet0 -a delroute="net,-hopcount,0,,0,192.168.0.2"
     Method error (/usr/lib/methods/chginet):
             0514-068 Cause not known.
     0821-279 writing to routing socket: The process does not exist.
     route: not in table or multiple matches
     0821-207 chginet: Cannot add route record to CuAt.
       

3. Then verify again

   • # odmget -q "attribute=route" CuAt
     
     CuAt:
             name = "inet0"
             attribute = "route"
             value = "net,-hopcount,0,,0,192.168.0.1"
             type = "R"
             generic = "DU"
             rep = "s"
             nls_index = 0
       

Set backspace in Unix console

Sometimes the backspace key doesn't work for Unix. You can custom the key by:

stty erase 

For example:

stty erase ^H

Two tips for AIX

Tips 1:

When performing AIX installation by a mksysb backup, remember not to perform the following steps.

1. Trigger open firmware prompt
2. setenv real_base 1000000
3. reset-all

It would caused the machine boot up dead lock in firmware prompt.

Solution : Call IBM Engineer to remove card battery in order to dry the cap.

Tips 2:

When you got the message key privileged password, that means someone lock the machine by SMS.

Solution : Call IBM Engineer to remove card battery in order to dry the cap. Then trigger SMS menu and disable password feature.