“AIX job preparation guide for freshers and experienced candidates. Number of IBM AIX frequently asked questions(FAQs) asked in many interviews”
☛ Backspace : to correct mistakes.
☛ <ctrl+c> : terminates the correct command and return to the shell.
☛ <ctrl+d> : end of transmission or end of file
☛ <ctrl+s> : temporary stops the output to the screen
☛ <ctrl+q> : resumes output which was stopped by ctrl+s
☛ <ctrl+u>: erases the entire line.
To login in:
Login id: <username>
Password: <the password does not appear>
To log out:
$ <ctrl+d> (or)
$ <exit> (or)
☛ AIX is designed as a multiuser system, a level of security is implemented to control access. Each user of the system has a user name and associated password (optional).
☛ If the user ID requires a password, the system will prompt for the password in a similar manner. While the user is typing a password, it does not appear on the screen.
☛ To terminate the session the user may either enter the exit or logout command, or press the key combination <Ctrl-d> (holding down the Ctrl key while pressing the d key.) logout only works if you are in your login shell.
☛ AIX uses a hierarchical file tree that consists of directories, sub-directories and files.
☛ The top level directory is called the root (/) directory that has many sub-directories.
☛ The file tree is mounted during the system start-up.
A command is a request to perform an operation or run a program. A process is a program or command that is actually running on the computer.We use commands to tell the operating system what task you want it to perform. When commands are entered, they are deciphered by a command interpreter (also known as a shell), and that task is processed.
The operating system can run many different processes at the same time. The operating system allows you to manipulate the input and output (I/O) of data to and from your system by using specific I/O commands and symbols. You can control input by specifying the location from which to gather data. For example, you can specify to read input entered on the keyboard (standard input) or to read input from a file. You can control output by specifying where to display or store data. For example, you can specify to write output data to the screen (standard output) or to write it to a file.
Commands :- Some commands can be entered simply by typing one word. It is also possible to combine commands so that the output from one command becomes the input for another command.
Processes :- A program or command that is actually running on the computer is referred to as a process.
A logical partition (LPAR) is the division of a computer's processors, memory, and hardware resources into multiple environments so that each environment can be operated independently with its own operating system and applications
The set of operating system commands, library subroutines and other tools that allow you to establish and control logical volume storage is called the Logical Volume Manager (LVM).
NIS was developed to simplify the task of administrating a number of machines over a network. In particular was the requirement to maintain copies of common files (e.g. password, group and host) across different systems.
Server Message Block File system (SMBFS) allows access to shares on SMB servers as local file systems on AIX. In this file system, the user can create, delete, read, write, and modify the access times of files and directories. The owner or access mode of files and directories cannot be changed.
The HMC is a server or stand alone machine that provides a graphical user interface tool to manage several Power Systems. The HMC manages system through hypervisor and operating system. From version 7 it is truly web based and you can configure, installs and manage, partitioned, virtualization most of your Power5 and 6 boxes via HMC. There are many tasks you can do with HMC, such as,
☛ Powering off and on of the partition
☛ Configure and activate resources to the system
☛ Creates and stores LPAR profiles and allocated resources to them.
☛ HMC do the dynamic memory reconfiguration of the partition.
☛ Setup VIO server and VIO client thru HMC and do micro-partition, create storage
☛ pool and processor pool with it
☛ Provide virtual console to the partition
Most of the time we installed dual HMC for redundancy and make sure to achieve more uptime in a wide system.
The Network File System (NFS) is a distributed file system that allows users to access files and directories of remote servers as if they were local. Suppose, Server A, that makes its file systems, directories, and other resources available for remote access. Client's computers, or their processes, that use a server's resources. Export the act of making file systems available to remote clients. Mount the act of a client accessing the file systems that a server exports.
You need a HMC if you plan to:
★ Configure and manage logical partitions and partition profiles (selected models can configure LINUX partitions without a HMC).
★ Perform DLPAR (dynamic LPAR) functions.
★ Activate and manage Capacity on Demand resources.
You can also use the HMC to:
★ Perform service functions
★ Manage frames (towers), IOPs and IOAs. * Note that you cannot see below the IOA to the device level.
★ Manage system profiles (yes, you can have more than one!)
★ Power on and power down. The Service Processor is always hot if there is power to the server.
★ Activate and manage Virtualization Engine technologies.
★ 5250 emulation so you can get a console up on a i5/OS partition or a virtual terminal window for AIX or LINUX.
Yes. HACMP is tightly integrated with the AIX 5L operating system and System p servers allowing for a rich set of features which are not available with any other combination of operating system and hardware. HACMP V5 introduces support for the Linux operating system on POWER servers. HACMP for Linux supports a subset of the features available on AIX 5L, however this mutli-platform support provides a common availability infrastructure for your entire enterprise.
All popular applications work with HACMP including DB2, Oracle, SAP, WebSphere, etc. HACMP provides Smart Assist agents to let you quickly and easily configure HACMP with specific applications. HACMP includes flexible configuration parameters that let you easily set it up for just about any application there is.
Run the lsvg command on the volume group and look at the value for MAX PVs. The value is 32 for normal, 128 for big and 1,024 for scalable volume group.
You use the chvg command to change the characteristics of a volume group.
#mklv -y name_of_logical_volume name_of_volume_group number_of_partition.
Use the following command, where s partition_size sets the number of megabytes (MB) in each physical partition where the partition_size is expressed in units of MB from one through 1,024. (It's one through 131,072 for AIX 5.3.)
mkvg -y name_of_volume_group -s partition_size list_of_hard_disks
The partition_size variable must be equal to a power of two (for example: one, two, four or eight). The default value for standard and big volume groups is the lowest value to remain within the limitation of 1,016 physical partitions per physical volume. The default value for scalable volume groups is the lowest value to accommodate 2,040 physical partitions per physical volume.
To increase the size of the logical volume represented by the lv05 directory by three logical partitions, for example, type extendlv lv05 3.
Run the following command to display information about the logical volume #lv1: lslv lv1.
You can run the alt_disk_copy command to copy the current rootvg to an alternate disk. The following example shows how to clone the rootvg to hdisk1: alt_disk_copy -d hdisk1.]
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